| fl59bug |
Tue Oct 28, 2008 9:39 am |
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I have a spare crankshaft, bearing and flywheel from a 40hp engine I used to have. I am trying to practice setting endplay, so I assembled the crank, (thrust?) bearing, and flywheel, and stacked feeler guages together and slipped them in the opening between the bearing and crank. I maxxed them out, so that not even .001" more would fit, really tight in other words.
With the 3 shims which also came out of the engine (.014", .012", .012") removed I obtained readings of .051" and .053". The .051" was obtained using the paper gasket in my engine gasket kit, and the .053" was obtained using the metal gasket. I am pretty sure I did this test correctly. This seems like way too much clearance, and there is no way that with all 3 shims installed and totalling .038" that I could ever get the endplay in specs (.004" - .006").
How could this be? Could the bearing I used be really beat up and crushed? I torqued the parts together by hand, not to 217 ft. lbs in the manual, but really hand tight. Could this be my problem? Just FYI, I remember that when this 40 hp was in my car, I didn't notice ANY noticeable front to back wiggle, so how could I be getting this much endplay?
If I can maybe find out what I am doing wrong (if anything) checking for endplay using the crank/bearing/flywheel method, I hope to apply this experience to checking endplay on my current 40 hp motor when I pull it soon to re-ring the pistons.
Thanks for helping a newbie to engine building "learn the ropes"!
Ted |
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| RIS |
Tue Oct 28, 2008 10:10 am |
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When you put it together did the thrust bearing fit tightly in the case?
Like this:
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| fl59bug |
Tue Oct 28, 2008 12:02 pm |
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RIS, I actually did all of this "on the bench". I no longer have the case that goes with the crank, bearing, and flywheel. When the crank, bearing and flywheel were actually in the case, I never really checked endplay, I only tried to wiggle the crank pulley in and out and noticed that there was no detectable movement.
What I did here was basically a dry run of checking endplay so I would know in the future how to do it on an running engine or one that I am rebuilding. The resulting .051" - .053" of endplay without shims really surprised me. It is a good thing I am not using this crank/flywheel in another motor if they have this much play. Maybe I should purchase brand new bearings and do the test again. Could it be that the bearing got damaged or something between the time I took it out of the other engine and then ran this endplay test?
Ted |
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