What happens if you spin a bearing

You may have seen the episode where Marty's WRX spun a bearing , but what exactly happens when you "spin a bearing" in a motor, and why is it so bad? We all know traditional four-stroke piston engines rely on a crankshaft spinning in block, which also has connecting rods attaching that crankshaft to the pistons shooting up and down the cylinder bores. The crank and rods can spin at high-speed without melting together because they sit in specially-measured bearings that have a micron-thin amount of oil lubricating the spinning metal.

You might have seen shows where people built engines and they talk about bearing clearance and measuring - this measuring is critical for bearings as they rely on a thin film of oil that comes through the oil passeges in the block and lubricate the crank and rod bearings as the engine spins. When that oil film runs dry, or if the bearing stops spinning due to another problem, the high-speed all these parts spin at means the damage is instantaneous and catastrophic.

The familiar knocking noise AKA "rod knock" is the connecting rod banging around on the crankshaft doing horrific damage. 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.

And is the selection of heat or AC, controlled by a va I changed the battery but the problem continued. The motor runing but some electrical parts stop to work like head light,turn light ,radio,Please help me.

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Report Follow. Login now! You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter Blitzed95Eclips Start date Apr 10, Blitzed95Eclips Proven Member. Im trying to be hip with the lingo. What does it mean when you spin a bearing. I constantly hear of people doing this and it destroying their motor. I figure it has to do with the same bearings i had to replace because of crankwalk.

Defiant DSM Wiseman. Nearly, but not usually. It's very rare that they'll finish a lap, most often they'll get just far enough that the tang that's supposed to hold them in place wedges again, then if it's a connecting rod, the rod will often snap, and if it's a crank bearing, it'll seize the motor up.

It's also common that only one half of the bearing will seize, and you'll find it stacked on the other half of the bearing still in the saddle. It's very nasty, and often results in both a block and crank that are no longer useable.

The "crankwalk" bearing has another pair of faces on it, front and rear, besides the one the crankshaft rotates on: it's the thrust face, and is a part of the crank bearing that wraps up along the cheeks of the middle crank bearing saddle, and has surfaces which the cheeks of that crank journal bear against during axial crank load, such as cornering and when using a clutch.

These extra faces make it a little less likely to spin, unless there's an oiling failure, and even then it probably won't be the first one to go.

I just had this happen with my motor. I actually spun two of the rod bearings with only 67K miles on the car. I wanted to try to find out how common this is in the 4g63 engines.

I hear a lot about crankwalk, but not much about spun bearings. Are there any resources or websites to check this out? RallyxDave Proven Member. Check out my website and you can see what a spun bearing looks like I had it happen to me early last year. RallyxDave, I looked at your site.

It looks like you have a lot of fun with your talon. It also looks like your engine sees more abuse than the normal daily driver. What were the repairs that you needed? Spun bearing victim It wasn't that bad. Just snapped the rod and put one end through the side of the blockr resulting in a 3 in.

The big end of the rod that connects to the crank was actually ripped off the crank. One of the bolts that holds the cap down was ripped out and the other bolt was somehow twisted and mangled along with the rest of the cap. I fell out when I dropped the oil pan.