[C2] Clutch pilot bushing
Thread Starter
Burning Brakes
Joined: Jun 2007
Posts: 1,062
Likes: 10
From: Dallas TX
Clutch pilot bushing
How tight should the bushing fit on the input shaft? Recently had transmission rebuilt and when test fitting the new (and old) pilot bushing on the input shaft, i need to slightly tap them on. To get them off, slightly tap.
I purchased another one and They all measure the same ID.
My buddy says the should slip on and off by hand.
1963 with T10.
I purchased another one and They all measure the same ID.
My buddy says the should slip on and off by hand.
1963 with T10.
Race Director
Joined: Apr 2005
Posts: 11,293
Likes: 2,149
From: Bowling Green, Kentucky
Your buddy is correct. 
Probably a few thousands clearance for a correct fit. Although if the correct Oilite bronze it will wear in with time.
Mike the end of the trans input shaft and tell us what you got. This is a known dimension for all factory produced parts.
Larry
Probably a few thousands clearance for a correct fit. Although if the correct Oilite bronze it will wear in with time.Mike the end of the trans input shaft and tell us what you got. This is a known dimension for all factory produced parts.
Larry
Last edited by Powershift; Mar 5, 2018 at 06:52 PM.
Racer
Joined: Dec 2010
Posts: 254
Likes: 28
From: iroquois ontario
Pilot bearing
Do not install fitting tight as it as. It will heat up before it wears in.use emery cloth and see if you can expand the hole in the brass bushing.
I just replaced mine with a napa bushing made in USA and it slides on
easily.
Fred
I just replaced mine with a napa bushing made in USA and it slides on
easily.
Fred
Race Director
Joined: Apr 2005
Posts: 11,293
Likes: 2,149
From: Bowling Green, Kentucky
FWIW.
Larry
Race Director
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From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
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I would try polishing the input shaft end before messing with the bearing. Dress it with fine emery cloth and then wipe it with brake fluid or lacquer thinner after. If that bearing is an import I wouldn't be surprised.....nothing fits right from offshore manufacturing. 
Yes, it should slip on easily but with no play.
.
Yes, it should slip on easily but with no play.
.
Last edited by Kerrmudgeon; Mar 5, 2018 at 08:42 PM.
Racer
Joined: Dec 2010
Posts: 254
Likes: 28
From: iroquois ontario
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
The bushing should be a press fit into the crank. The clearance to the input shaft can not be measured accurately until the bushing is driven into the crank because once this is done, the ID will tighten by a couple thou.
Last edited by 65tripleblack; Mar 6, 2018 at 08:16 AM.
Race Director
Joined: Apr 2005
Posts: 11,293
Likes: 2,149
From: Bowling Green, Kentucky
Interference fit to the crank is around 2-4 thousands (0.002 to 0.004 inch). Bushing will compress a bit from this installation......but to a slightly lesser degree.This is why a "dummy" input shaft is a good idea: both to install bushing and to make certain it is a loose fit after installation.
My old records show input shaft nose diameter is 0.590 inch and bushing ID is 0.592-.593 inch.
Autogear (CF Vendor) makes a VERY NICE Oilite bushing. Even custom sizes. Give them a call.
Larry
Last edited by Powershift; Mar 6, 2018 at 08:55 AM.
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