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Jan 21st, 2020
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Joined: May 2015
Posts: 8,037
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
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Just a guess here, but wouldn't the hole in the rear have been machined enough to create a place for a live center for machining the main journals?
Kevin Newest Project - 51 Chevy 3100 work truck. Photos [ flickr.com] #2 - '29 Ford pickup restored from the ground up. First car '29 Ford Special Coupe Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
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Joined: Feb 2019
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I would at a minimum, I would do a runout of the bushing bore (or the bushing itself). That would confirm if it is usable as is. As per the “Chevrolet Truck Shop Manual” the pilot bearing runout should not exceed .008” TIR (Total Indicator Reading). That is quite a large tolerance so it may not be so critical.
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 Chevrolet 3100 Project JournalsStovebolt Gallery Forum‘59 235 w/hydraulic lifters “Three on the Tree” & 4:11 torque tube Updated to: 12v w/alternator, HEI & PCV
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Joined: Jun 2022
Posts: 341
'Bolter
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Dorman states the 690 034 pilot is "only used for automatic transmission conversion to manual transmission. Powerglide to 3 speed manual 1.06 OD."
Using guide pins, the tranny slides in place with no effort.
Runs smooth.
~~ Jethro 1954 3100Back to LifeIn the Dity Gallery1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020
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Joined: Mar 2010
Posts: 10,719
Renaissance Man
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The hole in my '53 235 "w/Powerglide" crankshaft accepted the Dorman 690 034 perfectly and ran true with a 3 speed and a T5 transmission. That hole looked to be machined to me.
Kevin brings up a good point about the need for a concentric hole for machining the journals.
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Joined: Feb 2004
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Kettle Custodian (pot stirrer)
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A dial indicator is your friend- - - - -like the slogan Sun used to put on all their test equipment- - - -"We test, not guess!"
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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Joined: Feb 2019
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If the Shop Manual is calling out a tolerance, it is something that should be checked. That bushing is tough to change after it all reassembled.
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 Chevrolet 3100 Project JournalsStovebolt Gallery Forum‘59 235 w/hydraulic lifters “Three on the Tree” & 4:11 torque tube Updated to: 12v w/alternator, HEI & PCV
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Joined: Jul 2000
Posts: 2,036
Insomniac
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I wish I had seen this thread last Fall when I was dealing with a stubborn pilot bushing extraction and install. Seems like shoddy workmanship on GM's part.
Gord
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1954 1/2 ton 235 4 speed
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Joined: Feb 2004
Posts: 26,953
Kettle Custodian (pot stirrer)
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Seems like shoddy workmanship on GM's part. Seems like pretty good production cost control- - - -not doing unnecessary machining on a crankshaft that was not expected to last beyond the warranty period, 60 years ago. Did the foundry and the engine factory really care that someone would be trying to fit a square peg into a round hole nearly a century after the engine was made? Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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