How to fix a spun bearing on a chevy 350 Sethi highlights NexaMotion Group’s mission to simplify complex vehicle repair and support the broader industry through innovation. There is a reason that it happpened, and it's not bad luck. This is the beginning of a 383/388 stroker build I will be building. When these operations take place, many technicians use an abrasive wheel or Scotch Brite® disc to remove gasket material. replace the engine with a 350. Thats what a spun beari Might last for ever as a grocery store runner. No way to tell. My question is what is involved in getting this rebuilt? I have never rebuilt a SBC engine. Profile Page. Thats the last time the engine ran with that noise before I took it out. At the heart of NMG’s strategy are its core values—commitment Customer: How mush will it cost to fix a spun rod bearing in a 95 eclipse? Answered by Steve in 10 hours 18 years ago. Spun bearing causes the rod bearing to jam up. either way the engine will probably be coming out. Best not to run it more than absolutely necessary. He suggested I fix it by self or have a new engine put it in. Rod Knock Causes: Chevy Colorado. My plans is to build a stock 305 chevy engine and turbo My boy spun damnear every bearing in a 305 and it didn't contact a single valve. 040 oversized. 7L/350 Clevite Engine Parts Rod Bearings and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Rod Bearings, P Series, TM-77, Chevy, Small Block, Set of 8. The 4th journal on the cam, second from the back was black, like the bearing was getting really hot. When I rotated the motor via the fan/belt only the outer ring spun and the inner ring would only grab here and there when there was a little more friction. This sound started randomly on a drive and When bearings spin (or even get loose and rattle) the bore the bearing sits in malforms. The Chevy 350 is a V8 engine that was produced by General Motors. 979. Lets check out this used SBC 350 engine that we picked up at a really great deal, when you buy a used engine and you did not get a chance to hear it run, its Took apart a 454 4-bolt this afternoon and found the front main bearing had spun and badly. All songs are purchased samples. This causes the clearance between the inner surface of the bearing and the connecting rod to increase. I pulled off the outer pulley so I could see the innner and outer hubs of the balancer. Fast forward to now, with my tax refund in hand, the wife has agreed we can afford to fix the Chevy Forums FREE technical assistance for your restoration and repair. In all my limited experience I have never seen a spun main. Technically, the two main reasons why the bearing can spin in it's bore is because: The bearing has insufficient retention to resist turning during normal operation. 4. Spun bearing in the bottom end. Rod bearings exist in between the crankshaft and piston connecting rods. The thing is it has spun rod bearings, here is the worst looking one. BradJ New Member. The engine had 200 miles on it when I abused it at the track so the 60K tunup will have to wait a bit. I provide clear instruction take the oil filter off. 6 sec qtr mile 69 Camaro and 63 Nova . A spun rod bearing In this video I show what a spun bearing looks like. Rod Knock/Worn Bearings Rod Knock. He immediately shut it off, and left it parked behind Thanks to everyone for participating in a great forum. that would be kind of risky. User Info. I believe its a pm rod. Dropped a new (not reman) GM long-block 350 "R" code (Vortec) in my neighbor's '96 last summer, he made it out the dealer's door for under $2200 with a intake / exhaust gasket kit. You may be lucky enough to be dealing with only a single bad bearing. The video above shows what happened to an L99 motor after it spun its bearings. Joined: Feb 24, 2006 Posts: 3,503. Call 800. cab 4. That will necessitate replacing the crankshaft, resurfacing the engine block, and possibly replacing the pistons. -Seems like we used something like . While it’s possible to fix a spun bearing yourself, it’s often a labor-intensive process that requires specialized tools and knowledge. I recently acquired my granddad's 1953 Chevy 3100. Apr 25, 2020 #1 Headed back in the garage today to proceed with my project. That beard on it is bronze that was being pounded into foil by the crank and extruded alongside the bearing. On tri-metal bearings, the 2nd copper layer serves 2 purposes, 1st, it helps the bearing material adhere to the steel backing. The engine had s Engine Tech - SBC spun cam bearing - I have a sbc 350 engine that is currently set up to run mid 12's it lost a little oil pressure the last time it was ran so we pulled it apart and found out that it has spun a cam bearing. nothing i havent done before. The truck in the vid is not mine just a vid I found with the exact same sound my pickup is making my truck was an original 350 4bbl truck with a manual and is still a manual but I’ve had enough suggestions to check that so I guess I’ll man up and lay in the melting snow for awhile and look the clutch and flywheel and bellhousing bolts just to make sure they aren’t the Today I break down my small block chevy 350 that came out of my 1990 Third gen Camaro with Holley Sniper EFI and Holley Hyperspark ignition. It’s deep and loud. Once apart, they found a spin bearing on the crankshaft, and metal throughout the engine. The dealer gave me a quote to replace many of the parts in the bottom (rods, bearings, and crank) for $4400 back in September. 6 cylinder was severely scored, caused by the rod bearing failure (spun). I had $750 added up to rebuild his old engine & then found a spun main bearing. I spun a main bearing in my CSVT and the noise was A Chevy 350 small block goes to the machine shop to show you the process of machining a block. Installing a new bearing may not be a press fit when they install the new bearing/bushing. Rod Knock Causes: Chevy Cruze. It took some digging to finally find out that the oil control rings that I purchased were for pistons with a . however it is easier and cheaper to fix it before it lets loose. i am running a small lift cam. now I just need to find another one. And warrenty didnt cover it because i wasn't the original owner. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. I have had on L82 350 that spun a rod bearing in a 74 Z28 that after being rebuilt spun the same rod bearing with only Chevy Suburban: Bad Timing Belt or Chain Symptoms. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance I deal with alot of spun bearing races at work. I'm getting ready to put bearings back in. so the balancer is for sure toast. Is this beacause of the new bearings? Thanks:beers: Take note of which bearings have been damaged. Guy adjust valves wipes lobe off cam shaft. This is an older thread, you may not receive a response, and could be reviving an old thread. 50 liters and was first introduced in the Just spun a damn rod bearing in my 99 Blazer!!! :cuss: If you want to bring the thing to detroit I'll put the 250 motor in the thing plus 350 for my labor and swapping over parts. It had a rattle and we shut it down and pulled it out. Its clear to hear, that the engine is knocking and squeeking. Find CHEVROLET 5. 7L/350 Rod Bearings. Stuck cam - suspected bearing was spun (but wasn't) Thread starter Reprise; Start date Apr 25, 2020; Reprise. SHARE POST #17. Then will leak oil pressure and may spin again. Expertly executed by my friend, a master technician. mixedupamx, Apr 1, 2011. Put chain wrench around the harmonic balancer w/4' cheater bar. 8 ) Repeat with other rod. As to the Chevy design everything I have read indicates the 12-bolt is a pretty solid setup. A spun bearing will be acompanied by a knock and low/no oil pressure. Rod bearing make a double knock when they fail, mains a single. Original poster. I'm looking for a spec sheet or if anyone knows of a webpage that might have the correct tolerances for main, rod bearing clearances, and rod to rod clearance, torque spec for studs and bolts,have windage tray. I will be using these RHS P The rod bearings that failed were Numbers 5 and 6. It's possible that you have multiple bad bearings though, so take note of which bearings have signs of damage. 2in deep oil control groove, and when I measured my stock pistons I got a reading of . In extreme cases, they break through the block. it is probably just normal wear. what size is your rod bolts? The How to Replace Rod Bearings Chevy 350. Estimated Ship Date: Monday 1/20/2025 Chevy spun carrier bearing. Too bad the fresh 305 heads are a poor match for a 350, they are the 62 CC ish 434 early 305 heads with new springs etc. Could that motor be rebuilt by a professional technician without machining? There’s a decent chance it could be. Long story short, got REALLY happy with the gas pulling a friend out of a nasty pit. Model specific subject matter experts, classified ads and more. Your 48' Chevrolet 216 had a thin "centrifugally spun" thin layer of babbitt bearing material. If a bearing did indeed spin it is in need of complete disassembly and rebuild. 175in. A spun rod bearing or main bearing is caused by lack of lubricant or excessive head, and will cause an engine to knock before it finally seizes. Come join the discussion you will need to pull the motor. Shut it down immediately, and towed it home. I was warned of this when doing cam swaps as there was always the danger of scoring a cam bearing which would eventually wear the bearing, increase the clearances, lose control of cam bearing oiling and see a lessening and fluctuation of oil Slapping a high volume pump would be a band aide, if the pump is shot, sure, replace it, if you had a spun bearing you'd know it. Broke in the cam, changed the oil, started driving it around. to/2nRJ9p24AGE main bearings: https://amzn. This is it. A bearing failure doesn't mean it spun, but is pounded out. Jul 22, 2015 2,724. Cylinders should still be good w/ 1K if you're getting the whole story. The engine seized, which did bad things to the cylinders and rings, but none of the bearings damaged the crank journals. If the bearing spun in the rod, you must pull it and have the rod resized, along Fixing a spun bearing involves disassembling the engine, removing the damaged bearing, and replacing it with a new one. This might be some Jank stuff we did but hey if it works it works C4 Tech/Performance - Spin Rod Bearing/Spun Main Bearing - My vehicle is showing low oil pressure, and the symptoms are spin rod bearing, spun main bearing. spun rod bearing; grumpyvette Performance Subject Matter Expert --Posts: 17814 Age: 76 if I was really bucks down Id be looking for a salvage yard 350 for about $200 or a used car from a recent accident In some cases, spun bearings can be heard as a knock. 3 (and others) can be traced to the repair of intake manifold gasket leaks or head gasket replacement. I did find pieces of what looked like bearings in the oil filter. By Engine Builder. . I don't Tech Help. The majority of work today for stock and high performance 350's are for newer 1 piece rear main seal motors. I just installed a new crank kit in a 78 chevy 350 engine was tight to turn over w/o heads installed not with heads on. I just wanted to share a video of the sound of a spun rod bearing. but i am runnin a. Jacked it up real high. I have a gm tbi 350 truck engine that spun a bearing. Main bearing sleeves come in two half-moon sections, one that sits inside the main bearing cap and one that sits in the engine block. 040" under 400 mains and align bored those or maybe just alignhoned'm to the 350 main size---then machined in the bearing tangs in those 400 shells. mine went out cuz my oil pump went out tho. A bearing failure on one journal typically requires ALL rods to be resized on the big end and the main bores line honed or line bored to be right. Have it looked at. The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain: spun bearing Web 67-72chevytrucks. 2007 Chevrolet Classic, 3500 SRW, D max LT1 Camping mirrors, camping package, xm radio, on star. My bearing supplier thinks the engine detonated and took the bearings out. Thank you Steve for this great tutorial to sha Came back and jumped the truck and it had a slight knock and a loud "chirping" sound. Despite maintaining my wife's 2008 CTS religiously, last Friday night at 107k miles it spun a rod bearing. I have a new crankshaft for it but I need one connecting rod. Try your local machine shops. 73:1 Posi 10 Bolt Rear - 12. CHEAPEST WAY TO FIX A CAR THAT THROW A ROD BEARING, DO NOT ATTEMPTIf your car has a thrown rod bearing / spun rod bearing and you want to know the most incor Re: spun rod bearing 11-01-02 07:16 AM - Post# 133243 In response to GENUINE_GM ditto on the no cheap fix, if I was really bucks down Id be looking for a salvage yard 350 for about $200 or a used car from a recent accident thats been wrecked to pull a long block from, Ive bought 10-20 year old chevy,s with good engines some drunk rolled in a i am thinking the noise is coming from the lifters. I bought it knowing it had a knock but I assumed it was a rod knock. But if its worn out more, I machine out the bore, weld in a sleeve and bore it back out to spec. My question is can this be fixed? the block has had a lot of machine work done to it and That was my thought. com: User Name: It will last till it fails again. The problem is the original owner said the engine spun a rod bearing. it goes from 40lbs at idle to 0. Sorry if that isn't a useful answer - but note that it implies it will fail again. The distributor gear did seem to be wearing fast being chewed up a little but no teeth missing. It’s recommended to consult with a professional mechanic to ensure the repair is done correctly. Doing an engine replacement in a 1990 Chevrolet Silverado C1500 pickup. Save Share A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. be/6rYjXTANt80 Learn how to Install the rod bearings, take readings and verify clearances. How to Fix the Problem. if you spin a bearing you will really tear up the journal on the crank. Serviced to a T, the engine never spun over 3500 RPM’s in its entire life and it has 40,000 miles on it. I have read a few articles on bearing clearances for main & rod bearings. Normally, bearings allow the crank to glide on a hydrodynamic film of oil between the bearing surface and journal. 9) Slide the new upper bearing shells into these two rods, then pull the rods gently and squarely back down onto the crank journals, then install the new lower bearing shells into the caps and re-assemble. If it's has big miles, bearings could be worn, and a freshen in order. I'm pretty bummed, it's a standard bore that had never been apart. The point is, you won't get enough oil to lubricate properly where the clearance is too small, and you won't get enough oil pressure to lubricate properly where it is too big. I have some nice pics of the chewed up bearing and crank I hope to scan soon. i dont have an engine lift or i Sometimes you have to work with what you have! This is often the case in rebuilding some of these engines that are getting to be a bit older! Instagram: @jam This is a trick many experienced mechanics already know. I'm rebuilding a 1978 chev. there is no "easy" fix at all. 350 2boltmain, that came out of a 1500 pickup. In my mind, that isn't for sure the cause of the bearing seizing up and spinning. Spun Bearing This engine had a spun #1 rod bearing from running low on oil. Had it towed to a mechanic and he said spun bearing. In the picture shows the present position of my #5 cam bearing and DOESEN'T line up with any hole. He said the last time he started it, it started knocking. well i spun a main bearing in my truck. 2 auto ext. Pulled the pan, pulled the rod bearings, and felt the crank. Save Share I took it to a mechanic and he said it sounded like a spun bearing. Stole it from Walmart. ----- The bearing can look like it's in the right place, but the oil hole can be nearly closed up. com Its been a long time so don't kill me if I get this wrong but here is an easy way to check for timing chain slack. 2-4 the cam bearing holes line up with the main saddle holes. Spun Bearing I took the block to my local machine shop and he inspected the cam bores and measure them. also had a ford ranger with a v-6 that spun a bearing, it deadheaded the pump and blew OFF the oil filter. There are only a few issues that can cause a rod to start knocking. if it was a spun cam bearing, it would probably need line bored. My 350 chev did that, not a cheap fix, probably worse on a diesel Spun bearings are often blamed on a loss of oil pressure, but there can be numerous contributing factors that eventually cause the bearing to seize and spin. The dealership quoted me $4,300 for a rebuild and $6,700 for a new motor. 00. The front three cam bearings were completely destroyed, and the two rear ones spun forward out of the journals. What Is a Spun Bearing? One of the most common causes of rod knock is a spun bearing where the bearing literally spins in the end of the rod so that it has become out of position. How to Replace Rod Bearings Chevy 350. Spun Bearing Once you know for sure that you have a spun rod bearing, the next step is to decide whether or not you want to attempt to fix it yourself or take it to a professional. my 2000 blazer just rolled over 130k and i spun a bearing. Repair cost about $50. ALLIANCE MEMBER I spun a main bearing in my '01 duramax at 104,000 miles. However, it’s important to address any underlying issues that may have caused the bearing Spun a connecting rod bearing. Rod knocks are very uncommon in engines where there is low mileage. John . We got a rust bucket Chevy pickup 350 V8. the balancer is spun. Hey guys, my 97 Tahoe Crawler has had a 2600rpm knock for little while now, sounds good at idle and past that sounds pretty decent so took oil pan out, found cylinder 8 rod with play in it (what I expected). 3 V6, Specter CAI with a KN filter, Flowmaster custom exhaust, Custom TB About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright From many, many years ago, I remember being told that a symptom of worn cam bearings was erratic oil pressure at idle. This can be a difficult task, but with these simple instructions, you’ll have it done in no time. Quick fix is a short time fix. The bore is roughly . This engine is from a 1970 Corvette. The force or friction on the bearing is greater than should be 1965 Chevy II 2 door post 350 3 speed manual 2019 Ford Ranger Lariat Super Crewcab Email Report All the Chevy Sixes have babbitt big-end connecting rod bearings. Using a breaker bar and socket to turn the motor in the direction of normal rotation, turn it a little to remove all the slack from the timing chain. Most relevant . Talk to the experts. Spun Bearing 4AGE road bearings: https://amzn. The spun cam bearing/bushing may have damaged the block. Don’t neglec The average cost of a spun bearing repair; Types of repairs associated with spun bearings; Average costs of repairs based on vehicle type; Average costs of auto labor in different locations; Average Cost of a Spun I have been asking around for a running 350 found some free ones already, just needed some reassurance that was the right way to go. So we're pretty sure its a cam bearing. With the engine running, I could hear a clear knock from the 216 inline 6cly. Post: I spun a bearing in my 1970 impala 350 (Topic#353767) Chevykrys Poster Posts: 2 Reg: 11-04-18. Sometimes the bearing catches on the crank and starts spinning with the crankshaft, which builds an intense amount of heat that can lead to con rods snapping and Am I looking at piston slap, a spun bearing, or maybe a chattering throwout/pilot bearing? Thanks for the input! Reply. I know I really struggled to identify it until I tore the engine down. This engine does not have counterweights in the center of the crank. I'll try to post pictures when I get it home. I think #6 failed first and then took out Number 5. My engine had no sleeves, and was un-repairable. Number 1 piston, 350 chevy. Jump to Latest Iroc86 used it to fix a spun pinion bearing (he did some distructive testing to make sure it would work before he used it in his diff) and it worked like a champ. First remove the distributor cap and get it out of your way. I have learned alot here while lurking over the past few years, and this is a great source of info. A local shop and the local chevy dealership ($100 later) agree that the noise is from the bottom and likely a spun bearing. then you have bolts, gaskets, fluids, reassembly, etc. In this video, I show what a damaged crankshaft looks like. Something else could be the root cause, It could be that the main bearing that spun was oversize, installed by mistake. if you see 'metal flakes' in the filter element or in the bottom of the hello i have a 1989 454 from a motor home that loses oil pressure as it warms up than knocks. Part Number: CLE-CB663P8. Send Private Topic Most of the bearing failures in the 4. Freddy shows you how to diagnose engine connecting rod knock or spun rod bearing and goes through the steps to find out if it's a connecting rod knock, and w Usually, a spun bearing happens because either you were doing something stupid with an old engine (revving an engine with 200k miles on it up to redline) or you ran it dry of oil. Late-model engines such as a Chevy LS or Ford modular V8 with tighter yes cam bearing are brand new everything in this engine is brand new. 1970 350-sold 1968 SS 383 Daily driven. 9 v-6 4x4 daily driver. The cam got into the block and the cam is damaged beyond repair. the #1 cam bearing lines up with the oil hole in the block. if the bearings were spun i would mag the bearing saddles because a lot of times that will crack the block thru the oil passage holes. i know what a spun bearing sounds like and i can not feel the engine knocking when i put my hand to the block. Spun Bearing. 10-24-19 12:02 AM - Post# 2778637 hello well here i go with my 1st dumb question, im looking for popular opinion on a 350 that has spun #5 rod bearing better to (cost efficient)to purchase a short block or create motor or go ahead to the machine shop have it reworked, pros and cons for either thank in advance. I use white grease on the bearings to ease installation, and sometimes the grease will get in the way, so I have a little piece of aluminum welding rod with an angle bent on it that I can check every bearing on every block for proper positioning. Chevy Silverado 1500: $3. alum. Steve. It all specced out perfect and he installed a new set of cam bearings. I'm no expert, but doesn't sound like a spun bearing to me. Felt the truck lose a little power, and heard that noise nobody likes. It turned out to be one spun main bearing. I My upper bearing was spun in, in which a metal lip of the upper column was collapsed around the bearing, preventing me from removing it. Joined May 30, 2003 Messages 215 Location Auburn, WA. If the rod bearing wears enough, it’ll be too much for this cushion and you’ll hear a rod knock sound. Maybe a tip or two 70 Nova 350. Save Share Reply Quote Like. Out came 3 cam bearings on the cam but they came off with a little persuasion and the cam looks fine. While it’s possible to fix a spun bearing yourself, it’s often a labor-intensive process that If you are determined to do this repair in spite of these things, if the bearing didn't actually spin at all in its bore - just leave the heads on and pistons in, buy a crank kit with the Look at the #1 bearing on the right side of the picture. I haven't taken the rod cap off but I know I've always heard people saying you can "fix" The only way I would fix a spun bearing is remove the engine and pull the crank and have it machined. but if its not that bad you might be able to clean the hole up good and put bearing mount on the bearing and put it back in. Oil pressure will be low if not lost and pieces of metal are going everywhere. Current ride: 2000 s-10 2. Chances are good the rod is repairable. Do I have to replace it with a pm rod? Do I have to weigh other rods to get a rod thats the Post: spun rod bearing; vegamatic Member Posts: 85 Reg: 10-28-02: 11-01-02 07:42 AM - Post# 133244 In response to grumpyvette Let's assume its for a 350 , cast crank , 2 piece rear main seal motor. TCI Streetfighter 350 - 3. Planning on replacing rod and main bearings. It ran good, started easy, ideled fine. Finding another R code block without a spun bearing was like pulling teeth. CHEVROLET 5. tomorrow i will be changing the oil and using and I had a Chevy 396 that suddenly developed a knock, it had GREAT oil pressure, 60 PSI at idle. Supporting Donor. Hello everyone, I have a Co-Worker who is trying to sell me a SBC 350 4 bolt main. About an ounce of bronze I tried that once on a 283. This means the metal literally melts into the crankshaft – and repairing it is often impossible. BrandonB. This is my first complete rebuild from from machine shop and up. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Engine is trash. the sounds seems to quiet down a bit when i work the throttle, i assume its because it is causing the oil pressure to rise a little and quiet the lifters. Cam bearings hold the camshaft in place while it rotates and drives the cylinders. Even the plugs look good. Now make a mark where the rotor is pointing. that's what I was told. I had an oil pump pick-up fall off causing the #6 rod bearing to spin. 005 oversize or so, Loctite 609 does work. Published: Sep 4, 2015. Better consider finding a different block. if you can reuse your stock block and crank figure roughly about 2500 to 3500 to have the bottom end rebuilt. So I installed the new cam today and noticed its VERY tight. r. I also talk about my 305 chevy rebuild project. Rod Knock Causes: Chevy Camaro. Main bearings can wear with normal age, or become pitted and galled with insufficient lubrication. Please help me identify why my box chevy project is making weird noises ( Cracked Flexplate Sound ). Part Groups. it takes about 15 or 20 minutes to knock. As a result, there will be excess play between these two connected Update! I change the oil today to 10w40 but no change. Used some emory cloth, worked the crank and put new same size bearings in it. Chevy 350 bottom end knock. The main bearings on either side of the rods that failed also look great. heads. 2008 corvette sold and waiting on a Many years ago i spun a bearing in my 454, which was not an uncommon problem. Join me in this video where I reveal a hassle-free technique to roll in a main bearing without the hassle of removing the engine. If its not that bad, within . Spun Bearing So I'm in the middel of rebuilding a 350. com/shospeedDue to factors beyond my control, I The no. Will pull engin This is part one of a spun bearing on a Chevy 350 motor If you suspect a spun bearing is the culprit, it’s important to address the issue quickly to prevent further damage to your engine. The most common cause is a spun bearing. I then found an oil leak on my sender unit, I changed it but the same thing little pressure at idle but about 30 psi while driving! Bearing spun? Oil pump came apart? Bill A spun rod bearing means the bearing shell has welded itself to the crankshaft and the tang/groove that locks it in place was subsequently torn off the bearing shell and the shell is gringing the connecting rod journal. Decided to buy new bearings, crank, rings, dart heads, 525 lift lunati cam, roller rockers. In many cases, spun bearings cause the connecting rods to snap. When I tried to install the cam bearings, the number 5 bearings are too small. Do you really want to save the 305? '83 Silverardo XST - ZZ4 powered '95 Jimmy SLT (Bought @131,814) wow thats weird. Actually lots of play. I had just gotten rear ended the night before which damaged my bumper and exhaust. 2nd, it gives a visual cue to the mechanic, if you see copper, you've gone through the bearing material and you I need an engine for my 40 Ford pickup project. -----To fix the damaged area at the front of the block I have bolted a lathe tool to the front of a cam---where the lathe tool sticks out the side of the cam nose bout 1/2" to sweep the worn area. Come join the discussion about performance, modifications, classifieds Tore down my chevy 350 and found where the rod bearing spun. Don't mess around with a quick fix. The problem is all the other bearings look new. This is actually my second ZR2. 55 12 bolt and a newly added 142 wieand blower. retired race engine builder,former NASCAR tech inspector. This is part one of a spun bearing on a Chevy 350 motor Got a call back from the dealer about 3 hours later saying they heard the noise coming from something on the bottom end, and Chevy had authorized them to tear it apart. The rod bearing basically floats on a cushion of oil between it and the crankshaft. it was 20 PSI at 60 MPH. https://twitter. 3. GM master tech for 15 years/ASE master tech for 20 years. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board spun bearing? Web 67-72chevytrucks. 99: For example, if you’ve spun a bearing, it will be “fused” to the crankshaft. The actual bearing surfaces are precision engineering, even if the rest of the crank component looks -Might be able to buy or machine up a single extra thick brass washer to compensate for the block wear and the machining to fix that surface. Ran it up and down the various speeds. Possibly a bearing spun in that location at one The best case scenario for fixing a spun bearing is you'll replace the crank, rods and pistons, but the block is often also toast so you need a complete new bottom-end on your motor. Just because it spun the bearing doesn't mean the block is trashed. 350 Small Block Chevrolet. Ill just buy a new crank, will i Rod Knock Causes: Chevy Suburban. the motor has approxmitely 32k and is stock except for being carburated. If your Chevy 350 is making noise, it may be time to replace the rod bearings. Member. Here are the steps you need to take in order to replace the rod bearings on your Chevy 350 engine: Remove the oil pan and drain the oil from the engine. size. Standards and why you need them, Soft vice jaws. If it is a spun bearing there is no way the insurance company will cover it. Engine Got a small block 350 spun a bearing originally. just wearing off the surface and exposing some copper is not in my opinion indicative of spinning a bearing. You also need to do this so you can clean out the inside of the engine because you now have small pieces metal in the oil galleys that WILL find there way into your oil pump and can lock it up causing more damage after trying to just make a quick fix. Spun Bearing 7) Once piston moves part way upwards you can reach up and slide the upper bearing shell out. to/32oJsqw4AGE complete kit - rod bearings + main bearings + thrust washer: https its definately a spun bearing ive done it before and repaired it before motor out different cars but im not worried about how much i get outta the car but to have a car that was well maintained is gonna get more than one that just by starting it up youll know its in need of some expensive engine maintenance. Lifetime VIP Donor. When I started it cold it had good pressure. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. im going to buy a short block for $870 and rebuild it myself. how to fix a spun bearing on a chevy 350? Jake I had three (out of four) spun rod bearings on my daughter's Accord when somebody who will not be named ran it out of oil on the freeway. take the oil filter off. When I purchased them they were listed as "Stock chevy 350 piston rings", but they were not correct for my stock pistons. 2 days into it, tonight I pulled up to check the mailbox and heard it squeking with a mild knocking. ST7317 wrote:This is in regard to a small block Chevrolet nitrous motor. thought I spun a bearing in a chevy van once(350) but turned out to be a cracked flex plate. Results 1 - 20 of 20 Connecting Rod Bearing Set-Chevrolet V8, 262-265-267-294-305-307-325-346-350-365-400, 1967 Rod Knock Causes: Chevy Silverado. got the new cam and lifters today. Now would be a good time to replace the enging with a LLY, as it is almost a Plug n Play in a 03. That's my luck, though. 75 out of 5 stars. Had my girlfriend bump the starter while I pulled on the wrench. Squirted lots of penetrating oil in each cylinder. The EGT temps were Spun Bearing Repair Part 1 https://youtu. It only lasted a few months and spun a bearing again. it squealed like a banshee. A rod knock is perhaps the easiest knock type to identify. the old bearings looked new. The main issue it has is that my friend thinks it's spun a rod bearing. Stories grow after the fact, but it's inconcievable (to me) that somebody would run a motor for 15 minutes without a posative oil pressure reading. The main bearings have oil holes that lubricate the journal. Threre is a hole in the gally that goes to the bearing but is blocked by the back of the bearing. Used engines range from $2800 to $4000, I was afraid to buy a used engine as my old one only had 204000 miles on it when it took a dump. When they wear out, the space between the rod bearings and connecting rods grows. And i remember a few years back that it was much more expensive to build up an olds engine rather than a chevy when i was considering rebuilding the olds rocket 350 currently in the car (which was pushing about 380hp before i spun a rod bearing and warped the crank, it runs now but knocking a lot at 3000+rpm). Can I fix this problem from underneath the vehicle by removing the oil pan, or should I remove the engine off of the vehicle, and is it cheaper fix the problem or If you ever wondered what a rod bearing noise "looks" like. Chevy Forums FREE technical assistance for your restoration and repair. 1987 Ford Ranger SXT, 5spd 2. CAREFULLY cut the top of the filter off, remove the filter element, and cut it to stretch is out. They can spontaneously spin the bearing, but that is not very common. Started as a ticking noise when engine warm, developed into the knocking noise here. its an 84 Pickup with a 305. A set of worn bearings across the board can show a pressure drop. Remove the rods from the cylinders. We took a chance and put the new cam in hoping it would be ok, started it up, and the oil pressure was at 6 maybe 7. The crankshaft journal spins within the two. 1. I dropped the pan and found lots of metal in the oil. ive changed the oil pump and rod bearings trying to fix this problum. Please consider creating a I have a 70-72 350 block. By catching and fixing a spun bearing early on, you can save yourself from costly repairs down the line and My '72 has mysteriously spun a rear axle bearing and I'm told that Chevy had a "not so hot" rear end planning dept back then, and to get a whole new setup. Established Member. Truck is getting a brand new engine with 4500 miles on it. that would be the bottom end only dropped off and picked up at a machine shop. And first impression seems 2 to 3 rods are loose probably spun. -----Many years ago I ran some spacers for the 350 main bearings. It all began to happen once my transmission went bad. Furthermore, the degeneration of the bearing causes a lot of fine metal particles to circulate inside the engine. -AND---you then have to make sure the main bearing don't get over into the crank journal radius's. I gave each connecting rod a good tug Found one has some play. Owner went with a Remanufactured engine due to the My dad recently picked up a 1989 Chevy Blazer with what looks to be a clone of a ZZ4 crate motor in it for cheap. Drove an OT Chevy 305 powered car to Florida one July and the worst thing I could have done was to install an oil gauge. Jan 15, 2008 #2 B. 69-$125. if you see 'metal flakes' in the filter element or in the bottom of the Everything You Need To Know About Spun Bearing! Comments. I replaced the pick up with a bolt on unit, replaced the crank, rod, bearings, etc and now it has happened again - only this time the oil pump pick-up is still in place. and I've changed cams before but not with new cam bearings. You will need a socket wrench and an extension Chevy Forums FREE technical assistance for your restoration and repair. Locked up - no oil from a derelict friend $100. It has a displacement of 3. Gary. The motor never missed a beat after rebuild and held great oil pressure. 0122, 7am-10pm CST, everyday. The block had to be machined for roller cam bearings to repair it. 10 gears 03 Chevy S10 Blazer 4x4 auto 4. i got new heads on it alreadt so itll be a whole new engine Rod Knock Causes: Chevy Equinox. So I opened up the bottom of the connecting rod and found a spun bearing. f. Changing out rod bearings The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In To 350, 4spd. believe me you could HEAR it. As you know the head gaskets are multi layer stamped steel not your basic fiber type used in my 350 Chevy --- I'm hoping for a response from someone who rebuilds often --- Matt, Brian, Jack ??? someone who has spent some serious time on these engines. Follow me on twitter. 420, dana 300, 35" krawlers on trailready's/ '80 Blazer 60,14 bolt, tpi 350, th400, 205, 35" swampers Link to my M38 build: http Let’s say you took an engine out of sweet old granny’s car. 66 chevelle 350 4 speed 3. is this normal? I thought it should spin easy. 2004 chevy 2500hd eclb, lly, 6spd manual, lift, rims and tires, afe King MB5224AM Main Bearing Spacers - Small Block Chevy, 350 Crank made by King Bearings, for as low as $111. Going to get the motor out this week and look at my options.
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