Pilot bearing vs. pilot bushing
02-12-2013, 07:48 AM
#1
Launching!
Thread Starter
Pilot bearing vs. pilot bushing I just pulled out my trans at 147,000 miles after a slight grinding noise and difficulty getting in to first gear on two occasions. Pilot bearing was bone dry, and input shaft had some slight wear. Anyone have any luck with pilot bushings? I think that would be a better way to go over the pilot bearing that uses the input shaft as the inner race.
02-12-2013, 08:52 AM
#4
Here's a good post from Jeremy @ RPM Transmissions:
https://ls1tech.com/forums/16900194-post12.html
https://ls1tech.com/forums/16900194-post12.html
You guys are forgetting that this is an LT1 car. They don't have an LS style slave. They still use a clutch fork.
First thing I would do is pull the clutch apart and make sure the disk is in the proper direction (rookie mistakes happen) just check it to be 100% sure. Then make sure you have a pilot BEARING in the crankshaft. I know, I know. Your dad and grandpa used bushings for 50 years and they were fine. But the T56 transmissions HATE bushings. If the trans is even slightly worn the bushing drags on the input shaft too much and won't allow the trans to shift well. Then inspect your clutch fork and make sure it isn't worn out. Also make sure the plastic cup hasn't fallen off the slave cylinder ball. Also inspect the throw-out bearing. They are a problem in the LT1 clutch system. Make sure the lip that the fork pulls against hasn't cracked and distorted.
Check all these things and I have a feeling one of them will be your problem.
Good luck.
Jeremy
First thing I would do is pull the clutch apart and make sure the disk is in the proper direction (rookie mistakes happen) just check it to be 100% sure. Then make sure you have a pilot BEARING in the crankshaft. I know, I know. Your dad and grandpa used bushings for 50 years and they were fine. But the T56 transmissions HATE bushings. If the trans is even slightly worn the bushing drags on the input shaft too much and won't allow the trans to shift well. Then inspect your clutch fork and make sure it isn't worn out. Also make sure the plastic cup hasn't fallen off the slave cylinder ball. Also inspect the throw-out bearing. They are a problem in the LT1 clutch system. Make sure the lip that the fork pulls against hasn't cracked and distorted.
Check all these things and I have a feeling one of them will be your problem.
Good luck.
Jeremy
02-17-2013, 09:13 PM
#5
Launching!
Thread Starter
Thanks for the responses, you two convinced me to get the bearing and a reworked input shaft. I'm also going replace everything from the rear main engine seal to the rear axle pinion seal (new clutch, slave, rebuilt trans, etc.) as I don't want to be doing this again.
Pilot bearing has a seal on the clutch side, anyone add extra grease? Are there any other pilot bearing options? I saw a larger sealed pilot bearing similar to what I had in my 1965 GTO that fit further rearward on the crank, I would assume this would work with a shorter input shaft from another vehicle.
Pilot bearing has a seal on the clutch side, anyone add extra grease? Are there any other pilot bearing options? I saw a larger sealed pilot bearing similar to what I had in my 1965 GTO that fit further rearward on the crank, I would assume this would work with a shorter input shaft from another vehicle.
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05-12-2013, 11:31 AM
#11
Launching!
Thread Starter
