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. I cannot think of any newer saws that would be worth … First time i've seen a report of a 2.0 with spun rod bearings. Start the engine and point the timing down toward the crankshaft. You can probably just replace the crank, I have done many that way with great results. Carefully tap the bearing out and then tap in a new one. This bearing came from the 3.8l V6 in my 95 Mustang. This is why spun rod bearings also cause noise. I have a spare block since the same thing happened a year ago but it needs a rebuild. I feel like I could do it without removing the engine. Boosted I agree with you. Whether it be from no oil in the sump, pickup being starved or some other reason as to why oil was not circulating through the system. If it is spun to the point it damaged the connecting rod(or main bearing cap), you will need to do more extensive engine tear down and repairs. After the repair is competed, the new rod and main bearings need to be plastigauged to ensure proper clearance. Most of the truely trashed lower end bearings did damage beyond just crapping the bearings so the rod, bearings and pin need replaced, sometimes at least one of the crank bells. It seems like it would work no problem from what I remember doing it before so if anyone has tried something similar let me know what u did n how it worked out for … Ive had to replace a spun bearing before ...pain in the ass. The crank was cut once before showing that this motor has spun a rod bearing before. This video has great audio of a spun and knocking rod bearing. To much time and hassle tracking down new bits and assembely for something that can usually be purchased in the $200.00 or less range. But im just … Explaining what a spun rod bearing looks like. The engine was built about 6000k miles ago with acl bearing with eagle rods and wiesco pistons. I was just expressing my preference for using calipers. Can't I just pull the oil pan off and then pull the two bolts off the rod and replace it like that ??? After removal of the engine sump/oil pan, main bearing caps should be removed one at a time. Last edited: Aug 18, 2008. Recently got a spun rod bearing, I think , because I hear a knocking from 1900-3200 rpms. Tims97SVT Active Member Established Member. Or can I just replace the bearings? That’s really bad news because a broken rod flailing around inside an engine can obviously do a lot of damage! A spun rod bearing will tear up the big end bore in the rod, ruin the rod journal on the crankshaft, and sometimes break the connecting rod. 2) In most cases, if a rod bearing has spun, the crankshaft gets scored and damaged, and in many cases, the rod, too. You will need to pay special attention to the "spun" rod. If they are not wore that much than you could probably get by with a little fine emery cloth to the crank and replacing the bearing I've had the car for about 2 days, and I'm … If the motor has to come out I'm getting a replacement long block but I don't have the cash right now so it'll have to wait. Just recently had a spun rod bearing, had the shop I go to replace the bearings and they polished the crank and rod that had the spun bearing. Reply . Should of had a V8 that morning. phyregod!!YTINASNI. So check the failed rod bearing to a … Once you get a rod end cap off look to see if there are any deep scratches to the crank or inside the rod ends. Step 5. In many cases, with a spun bearing you will find a rod forming into a egg shape that is found more desirable to replace than an attempted repair including the use of oversized bearings. I spun a rod bearing and found quite a bit of metal flakes in oil pan even though bearing appears 99% intact. I can feel the knocking coming from the clutch ( where you bleed your clutch ) but not the oil pan . Will a Ford Fusion block work? There is so much work to get to the crank and rod bearings (pull the engine, tear it down to the short block, pull the crank, etc) that you're doing about 80% of the work to fix a rod bearing as you would to just replace the engine. Take all the rod bearing out and replace them ALL and you SHOULD be fine as long as you didn't drive it far at all. You can get another crank with bearings with a kit, or do what i did, i ran cut cranks before, holding up just fine. Gonna have to inspect that crank, just spun a bearing this past fall, got my crank cut a new bearings. If that's the case, you have to remove the crank and have a professional do the necessary machine work. Often this is caused by the rod … To fix this, the crankshaft has to be removed and turned, and the rod replaced. There is a possibility that the big end bore has stretched, or the rod has warped. You did the right thing stopping it and towing it home. In my opinion you'd be ahead of the game if you just swap out the engine. As for clearance, if you subtract the crank journal from the rod bore with bearings installed, you'll have it. The problem with spun rod bearings is that the "spun" material had to have gone somewhere. When a rod bearing fails, it usually causes engine damage, the severity of which greatly depends on the engine and the failure event in question. I'm hoping it's a rod bearing or something I can replace with the motor in the car. Here's how I know. Hook up the positive and negative leads of a timing light to positive and negative terminals on your battery. [/quote] I let my oil run dry. To replace a rod, the head has to be removed. Thinking aloud, the normal cause for a spun bearing is lack of oil. What parts do I have to replace (usually)? How Hard Is It To Replace A Spun Rod Bearing, Is It Something I Could Attempt With Out A Machine Shop, I Mean Allot Of Experience With Motors But Nothing This In Dept. I most likely spun a rod bearing at a track event yesterday. I spun a rod bearing the motor seized/locked up. Heres my old saturn lifter vs rod bearing noise Lifter: (only listen to the idle sound and try to ignore the connecting rod bearing noise in the background, this islifter and rod bearing) real lifter noise - YouTube Rod bearing: This is generally healthy lifters, with a spun rod bearing. Jan 18, 2009 #7. Do I need to do a complete tear down now? Subaru EJ motors have a common failure - in stock or modified engines, that is a spun bearing, typically it is a rod bearing. Turn the engine off. On a few cars replaceing rod bearings can be done inplace- early 19802 Mercury linx had rod bearings replaced for $200.00 - easy to get pan off, clearance for wrenchs. 1 cylinder. Oil looks clean so I'm not sure if metal flakes in pan are from car being 24 yrs old with 200k mi or from this bearing. It could also indicate a rod bearing that has spun on the journal. You could take it … Try not to drive the car if at all, take the pan down, do the wax gage and measure the size of the over sized bearing your going to need, and be done with it then man. Bearing was still in tact and just started wearing down. Re: 350 V8 Spun rod bearing 08-28-02 09:44 AM - Post# 21349 In response to Robert_May Robert, actually I have used it. The result is less oil between the bearing and its cover, resulting in metal-on-metal contact. Everyone believes what they want I guess, I just … Do the flakes in oil pan tell me everything I need to know on whether parts like oil pump need to be replaced now or should I cut open oil … A spun main bearing will tear up the main bore in the block but rarely will it cause the … Yes. The sound seems like its coming from the middle of the engine but I cant feel it anywhere with the screw driver. Most of it probably landed in your oil supply, but some of it also may have fused itself to the crank journal (no oil = hot metal). And I guess I don't consider it hysteria considering I have 7 engines to rebuild at the moment all with spun rod bearings. Spun rod bearings are the most common failure. If the bearing(s) have not spun then there's a good chance you would get by just replacing them. I like to see measurements expressed on a dial. What are my options other than ordering an over priced short block from the dealer? Seen quite a few 2.3s with that issue though. 06+ 2.0 has vvt. . Joined: Nov 14, 2006 Location: Somewhere. I spun a rod bearing in my '04 Mazda 3s. 04-05 2.0 has no vvt. Long story short, everything was good measured down to spec, used undersized bearings. Brian. This is because a spun rod bearing, i.e., a loose bearing that rotates independently of the connecting rod and the crankshaft, seals the oil holes on the crankshaft. I'm not sure what would have caused this to happen and now I'm not sure how to proceed. You cannot simply replace bearings when there is a bearing failure, you need to have the rotating assembly examined and possibly machined by a professional shop to correct damage. Messages: 2,509. Symptoms are I was low on oil, heard a weird flapping/knocking noise (difficult to hear at speed), loss of power, loss of virtually all oil pressure (I have a gauge), coughs a bit of smoke on startup. Step 4. Thise means you'll need to replace all the rod bearings. At that point you will know what parts need to be machined and/or replaced. 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