C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Would no pilot bearing cause problems?

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Old Jan 30, 2011 | 08:57 PM
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Default Would no pilot bearing cause problems?

Having just gotten my new clutch and flywheel I got all the parts to put it in correctly. Taking my old unit apart was my first time seeing the clutch and flywheel assembly and I never had a pilot bearing in there. My old unit was a replacement to the original. So the guy who did it I guess never used a pilot bearing.

What would the symptoms be if no pilot bearing was used? I am going to use a pilot bearing in my install don't worry !!
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Old Jan 30, 2011 | 09:04 PM
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the input shaft would have a tendency to wobble around damage the rear of your crank, while doing that the input shaft bearing would get loose and eventually destroy itself taking your transmission with it . it may be something new, but I've never seen one without a bearing or bushing. Sometimes the bushing will be corroded and look like its part of the crank, make sure to lube whatever you put in there. getting the old bushing out is sometimes a pita, but time well spent.

Last edited by oldalaskaman; Jan 30, 2011 at 09:06 PM.
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Old Jan 30, 2011 | 09:05 PM
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Surprised the thing didn't feel like it was way out of balance all the time. I would have though that would have destroyed the clutch disc in just a short period of time.
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Old Jan 30, 2011 | 09:06 PM
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I must have over looked my pilot bearing when taking my old unit out who knows. I just don't see it laying around anywhere where I put all my old nuts and bolts ect..I just worry about the lube getting on the clutch and buring it out. I had a bad seal leak oil all over my old unit.

Thanks
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Old Jan 30, 2011 | 09:09 PM
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Im pretty sure your transmission would not survive the ride home without the pilot bearing. It keeps the input shaft to the transmission aligned, and if the shaft were to move it would hurt the gears and bearings inside the trans. I would check the play on the input shaft to make sure its still good.
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Old Jan 30, 2011 | 09:10 PM
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dont put alot, just very lite, if your new bushing or bearing wont fit, the old one may still be in there?
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Old Jan 30, 2011 | 09:59 PM
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He had to have had one in there dont see how you could shift without it.
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Old Jan 30, 2011 | 10:12 PM
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The pilot bearing must still be in the crank. It won't fall out by itself. It's pressed/pounded in. It need to be removed with a puller or by the hydraulic piston method.
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Old Jan 30, 2011 | 10:32 PM
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Well maybe it is still in there. I didn't even think about it being in there still. Shoot because I mounted the clutch/flywheel already. I doubt it is still in there because I sent my motor to be rebuilt and the guy painted it. I will have to use a flash light and see if it is in there ! Thank god I ask some questions sometimes.

The pilot bearing that came in my spec package didn't look like a bearing. Didn't have a rotating inside. Just like a thick metal ring. Is this normal?
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Old Jan 30, 2011 | 10:37 PM
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Originally Posted by derekguzz
Well maybe it is still in there. I didn't even think about it being in there still. Shoot because I mounted the clutch/flywheel already. I doubt it is still in there because I sent my motor to be rebuilt and the guy painted it. I will have to use a flash light and see if it is in there ! Thank god I ask some questions sometimes.

The pilot bearing that came in my spec package didn't look like a bearing. Didn't have a rotating inside. Just like a thick metal ring. Is this normal?
Yup. Although some motors use an actual bearing (that is an option), normally the pilot bearing is actually a bronze bushing like the slug you're talking about.
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Old Jan 30, 2011 | 10:40 PM
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I didn't put it in yet and I already mounted my flywheel/clutch. I was watching the youtube videos and the guy put it on the shaft then put his trans in.

Go to the 2:20 second mark and you will see him put grease on it
http://www.youtube.com/watch?v=b7g7FdPTXiw

Here is mine:
Name:  bearing.jpg
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Size:  97.7 KB

Last edited by derekguzz; Jan 30, 2011 at 10:51 PM.
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Old Jan 30, 2011 | 10:45 PM
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Originally Posted by oldalaskaman
the input shaft would have a tendency to wobble around damage the rear of your crank, while doing that the input shaft bearing would get loose and eventually destroy itself taking your transmission with it . it may be something new, but I've never seen one without a bearing or bushing. Sometimes the bushing will be corroded and look like its part of the crank, make sure to lube whatever you put in there. getting the old bushing out is sometimes a pita, but time well spent.
Exactly what happens!

Originally Posted by derekguzz
I must have over looked my pilot bearing when taking my old unit out who knows. I just don't see it laying around anywhere where I put all my old nuts and bolts ect..I just worry about the lube getting on the clutch and buring it out. I had a bad seal leak oil all over my old unit.

Thanks
The pilot bearing is a bushing and is pressed in-not something that would just roll out of the end of the crank..recheck with a good light and magnifier if needed-it's a bronze-coloured bushing.
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Old Jan 30, 2011 | 10:52 PM
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So I need to take everything back off and press it in there? DANGGGG lol whoops..


Well after I mounted my flywheel, I then stuck the alignment tool in there and put the clutch over that to align that clutch. If my alignment tool stuck in thee and held the clutch does that mean there is a pilot bearing in there?

Last edited by derekguzz; Jan 30, 2011 at 10:59 PM.
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Old Jan 30, 2011 | 11:04 PM
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Either way it is going to be easier to take it apart and double check rather than tear it all down once I get more stuff bolted up.
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Old Jan 30, 2011 | 11:06 PM
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It should, but thats a huge chance to take. dont stick it on the end of your trans then shove it in, put the bushing in there first then put the trans in. Always a good idea to slide it over the input shaft just to see how it fits on there though. Dont chance it...

if you can get in there with a flashlight you should be able to see if the bushing is in there or not.
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Old Jan 30, 2011 | 11:13 PM
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But say it is in there, should I take it apart and put a new one in there? or will it be to worn?

previous actions of my car were, HUGE chatter in reverse, and light chatter in 1st, 2nd gear.

If the bearing has a chance of being worn I don't want it in there.
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Old Jan 30, 2011 | 11:27 PM
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Replace it, they are cheap and easy to get in and out.

Just watched that vid, nowhere in there was a pilot bushing that was the throwout bearing (dotn grease yours). Use a torque wrench too on your PP flywheel etc.
Some of those Youtube experts.
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Old Jan 30, 2011 | 11:30 PM
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Yeah now that I looked closer at the vid I don't see the bushing either ! haha. Sorry its my first time and its late for me.

Yeah I made sure I torqued the bolts on both the FW and PP and Bell Housing. Thanks guys. Ill post tomorrow when I tear it all apart and find out.
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Old Jan 31, 2011 | 12:40 AM
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Originally Posted by derekguzz
But say it is in there, should I take it apart and put a new one in there? or will it be to worn?

previous actions of my car were, HUGE chatter in reverse, and light chatter in 1st, 2nd gear.

If the bearing has a chance of being worn I don't want it in there.
with this kind of 'actions' you would be ahead, while you have it out , to replace, or get replaced at a minimum, the bearings in the trans. they are alot cheaper than replacing the trans when it becomes junk. if you dont put a light coating of grease on the nose of the input shaft, the bushing will attach itself to your input shaft and spin inside the crankshaft, causing more problems than its fun to deal with.

Last edited by oldalaskaman; Jan 31, 2011 at 12:52 AM.
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Old Jan 31, 2011 | 08:01 AM
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love you guys thanks ! I will post info of what I find and do in a couple hours when I take it apart again and find out whats in there.
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