How much bigger for oversized bearings?
Thread Starter
Teching In
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How much bigger for oversized bearings? First off, this is not a LS1 or even chevy motor. Its on a 1999 Pontiac Sunfire. Sorry to post it on this website but there arent any "Sunfire Forums" and I know you guys know what your doing. Even tho i have a low post count, I spend alot of time on this site. With that said..
I spun a bearing on my #4 cylinder. So i dropped my oil pan and replaced the bearing with a new one and put it all back. There must be some play still on the rod beacuse anything after 2k RPM theres a slight knock. Not that bad tho. I went to Orileys to get an oversized bearing and they said they came in incriments of 10/1000ths. How can i find out how much bigger I need? Also if I need say 25/1000 oversized could i buy a 30/1000 and have a machine shop shave some off? Just remember this is a puny 4 cyl. (2.2) and I just want a temporary fix or any other suggestions that might stop the knock... Once i sell this one I will be talking to someone here for a WS6
Thanks!
-Paul
I spun a bearing on my #4 cylinder. So i dropped my oil pan and replaced the bearing with a new one and put it all back. There must be some play still on the rod beacuse anything after 2k RPM theres a slight knock. Not that bad tho. I went to Orileys to get an oversized bearing and they said they came in incriments of 10/1000ths. How can i find out how much bigger I need? Also if I need say 25/1000 oversized could i buy a 30/1000 and have a machine shop shave some off? Just remember this is a puny 4 cyl. (2.2) and I just want a temporary fix or any other suggestions that might stop the knock... Once i sell this one I will be talking to someone here for a WS6
Thanks!
-Paul
Copy & Paste Moderator
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From: Eastern MA
I think plasti-gauge (sp?) will tell you the clearance you have. Then you can compare that measurement to what the clearance is supposed to be and get a bearing that is larger by that difference.
Thread Starter
Teching In
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Originally Posted by VIP1
I think plasti-gauge (sp?) will tell you the clearance you have. Then you can compare that measurement to what the clearance is supposed to be and get a bearing that is larger by that difference.
Copy & Paste Moderator
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From: Eastern MA
I think you can take the measurement without removing the crank, but aren't you going to remove the crank anyway to replace the bearing? You might want to take the measurement twice, once on the main cap side and once on the block side to see if the clearance is the same.
I'm not an engine expert, though. I'm just going off what I do know.
I'm not an engine expert, though. I'm just going off what I do know.
Thread Starter
Teching In
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Originally Posted by VIP1
I think you can take the measurement without removing the crank, but aren't you going to remove the crank anyway to replace the bearing? You might want to take the measurement twice, once on the main cap side and once on the block side to see if the clearance is the same.
I'm not an engine expert, though. I'm just going off what I do know.
I'm not an engine expert, though. I'm just going off what I do know.
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Thread Starter
Teching In
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ive also had a few people tell me to put some sawdust in my oil, put in some lucas oil additive or try a super heavy weight oil. would this do anything? really the knock isnt that bad, its quite at idle.
Last edited by pecosbull; Jun 30, 2007 at 02:34 PM.
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Verdad Gallardo Copy & Paste Moderator
Joined: Apr 2002
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From: Eastern MA
Originally Posted by pecosbull
I was not planning on removing the crank. I thought the only way to get the crank out of the car was by basically pulling the enitre motor. I would like to make this a quick fix by going throught the oil pan, can the crank be removed from here?
Originally Posted by pecosbull
ive also had a few people tell me to put some sawdust in my oil, put in some lucas oil additive or try a super heavy weight oil. would this do anything? really the knock isnt that bad, its quite at idle.
Copy & Paste Moderator
Joined: Apr 2002
Posts: 9,764
Likes: 208
From: Eastern MA
Maybe you should post in the internal engine section.
Generation III Internal Engine:
https://ls1tech.com/forums/forumdisplay.php?f=5
Generation IV Internal Ingine:
https://ls1tech.com/forums/generation-iv-internal-engine-80/
You might get better/more-knowledgeable responses.
Generation III Internal Engine:
https://ls1tech.com/forums/forumdisplay.php?f=5
Generation IV Internal Ingine:
https://ls1tech.com/forums/generation-iv-internal-engine-80/
You might get better/more-knowledgeable responses.
yes u can so it that way if its a two piece seal but u have to unbolt the tranny obviously and with a spun bearing the rod hole has gone oval hence the knock, still no matter what bearing u put in there it will end up causing more damage. there is no temp fix for it. when this bearing fail which its almost there just hope nothing else happens like the rod snaps in half. anything worth doing is worth doing at least halfway right. get the crank turned 10 under and replace that rod.
