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Clutch pilot bushing vs roller bearing
#1350872 Fri Mar 20 2020 09:38 PM
Joined: Feb 2020
Posts: 16
B
Grease Junkie
I'm getting ready to transplant a recently rebuilt 235 into my 49 3/4 ton. It'll be bolted up to the original truck flywheel, bellhousing and granny gear 4 speed. The donor motor came from a 1957 210 series car with a manual 3 speed. I'm pretty sure that motor originally came with a bronze pilot bushing in the end of the crank but it now has a roller bearing.

I'll be replacing the old bearing before the transplant. My question, is there any advantage to replacing it with another roller bearing, or should I go back in with a bushing?


Thanks in advance,
Steve


1949 3600
Re: Clutch pilot bushing vs roller bearing
baldilocks #1350874 Fri Mar 20 2020 09:51 PM
Joined: Feb 2004
Posts: 20,351
H
Boltergeist
Using a needle bearing in that application is like putting lipstick on a pig- - - - -there's no real reason to do it, and the result might have some real downsides. There are too many moving parts that can fail in a roller bearing setup, so I can't imagine any good reason to substitute it for the old reliable oilite bushing that has worked for decades in untold millions of vehicles.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Clutch pilot bushing vs roller bearing
baldilocks #1350931 Sat Mar 21 2020 05:42 AM
Joined: Sep 2011
Posts: 702
B
Shop Shark
Bushing less likely to damage imput shaft v.s. bearing if it fails.


BC
1960 Chevy C10 driver 235 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
G.M dealer tech since 1980 & counting
Re: Clutch pilot bushing vs roller bearing
baldilocks #1350983 Sat Mar 21 2020 03:45 PM
Joined: Oct 2018
Posts: 49
C
Wrench Fetcher
Why some applications use a ball/roller bearing, and others use a bushing is something I have wondered about for along time.

Awhile back, I bumped into a retired driveline engineer, so I asked him that question. He said that some engineers would specify a bearing, if it was anticipated that the vehicle might be used in situations that required the clutch to be disengaged for extended periods of time. He did not elaborate of any specific applications and I kind of got the feeling that the choice was more subjective, than driven by any hard data.

I have also read that some transmissions need a more precise alignment of the input shaft, requiring a bearing. But that is just internet chatter, and I have no personal experience along those lines.

I am in the bushing camp. I have seen a number of input shafts damaged by bearings. None by bushings.

Edit: Actually, just happen to have transmission in my garage now, with a damaged input shaft...

Attached Files
Input Shaft.jpg (22.58 KB, 152 downloads)
Input Shaft
Last edited by CrowbarBob; Sat Mar 21 2020 04:01 PM. Reason: Added extra info
Re: Clutch pilot bushing vs roller bearing
baldilocks #1350994 Sat Mar 21 2020 04:42 PM
Joined: Dec 2017
Posts: 739
D
Shop Shark
Take a pass on the roller bearing. They are generally harder then the input shaft and will always cause damage. Use a real oilite bronze bushing, not a cheap bronze version, but the real deal impregnated bushing.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=988781

Last edited by Dragsix; Sat Mar 21 2020 04:44 PM.

Mike
Re: Clutch pilot bushing vs roller bearing
baldilocks #1351000 Sat Mar 21 2020 04:59 PM
Joined: Feb 2011
Posts: 894
R
Shop Shark
On my 39 216 it uses a roller bearing. The diameter hole in the back of the crank is larger than a bronze bushing diameter. Do any of you know of a manufacturer of a larger diameter bushing?

Rick

Re: Clutch pilot bushing vs roller bearing
baldilocks #1351015 Sat Mar 21 2020 06:29 PM
Joined: Dec 2008
Posts: 950
5
Shop Shark
Like Dragsix says, buy the good bronze bushing, NOT the one that a magnet will stick to.


Brian
My 1955 Truck

My other 1955 Chevy

The older I get the more dangerous I am!!!!!
Re: Clutch pilot bushing vs roller bearing
baldilocks #1351023 Sat Mar 21 2020 07:03 PM
Joined: Feb 2004
Posts: 20,351
H
Boltergeist
Rick, drop me a PM- - - - -I can either make you a bushing from a piece of oilite round stock, or a reducer sleeve to make a standard bushing fit your crankshaft. All I need is an accurate measurement of the trans snout and the hole in the crankshaft.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Clutch pilot bushing vs roller bearing
baldilocks #1351027 Sat Mar 21 2020 07:21 PM
Joined: Apr 2005
Posts: 8,654
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Isn’t there 2 different sizes?


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
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Re: Clutch pilot bushing vs roller bearing
Justhorsenround #1351029 Sat Mar 21 2020 07:45 PM
Joined: Sep 2001
Posts: 30,005
ace skiver
Originally Posted by Justhorsenround
Isn’t there 2 different sizes?
What years?
0.649 bearing [chevy.oldcarmanualproject.com] 1939-1957 (or to 1966 or 1987 in some applications), except Powerglide.

Did the Powerglide engine/crankshaft have no busing bearing?
I recall seeing vendors sell such a bearing for Powerglide 235 engines later used with a manual transmission (I'll post a link, if/when I find it - Dorman 690-034 [dormanproducts.com]).

Last edited by tclederman; Sat Mar 21 2020 07:48 PM. Reason: Powerglide crankshaft use with manual transmission

Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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