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| | | | Joined: Oct 2009 Posts: 171 'Bolter | | 'Bolter Joined: Oct 2009 Posts: 171 | Hello,
the end clearance at the intermediate bearing is at the crankshaft of my engine about .o16 inch. Is this too much to keep the engine working?
Ask
Wolfgang | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Do you mean the crank play fore and aft?
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Oct 2009 Posts: 171 'Bolter | | 'Bolter Joined: Oct 2009 Posts: 171 | | | | | | Joined: Feb 2004 Posts: 29,868 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,868 | Normal end play is .006" maximum. Are you working with new or used main bearings? A new bearing might get you closer to specification if the thrust face of the crankshaft isn't worn badly. Sometimes a wrong clutch adjustment will cause a constant pressure on the flywheel and crankshaft which wears out the thrust bearing and the crankshaft flange. Too much end play will sometimes cause an intermittent knock that's hard to find.
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!
| | | | | Joined: Mar 2010 Posts: 10,301 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,301 | What is the procedure for measuring crankshaft end play on an installed 235?
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Pull the pan, rock crank back and forth while measuring.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2004 Posts: 29,868 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,868 | A pretty close estimate can be done without pulling the pan. Mount a dial indicator on the lower part of the bellhousing with the stem on the flywheel, and pry the harmonic balancer forward and the flywheel back. The movement of the dial needle will be the end play of the thrust faces.
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!
| | | | | Joined: Mar 2010 Posts: 10,301 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,301 | Thanks Jerry. Thanks Ed, but what did I do to you lately for you to want to make me get all covered up with oil?  (Its a safe bet I do deserve it for something or another.) Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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