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Crankshaft Thrust Bearing Failure

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Ted

10-11-2002 22:32:31

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Just wondering if any of you ever have problems with the thrust bearings on high reving engines. I have a turbo charged Oliver with a double disk clutch. I hold the clutch in while building boost and around 5800rpm I let off the clutch. Is this too much strain and rpm pushing ahead on the thrust bearing? I started out with .008" crankshaft endplay and now I have .028" endplay. I know I have to fix this but if I don't do something different it is just going to do it again. Is this one of the reasons the big guys run centrifical clutches?So the are not pushing ahead on the crank so much at the high rpm's? Just thought I'd ask you guys what you thought-any response is appreciated.

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Goldsburg

10-14-2002 20:01:05

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Re: Crankshaft Thrust Bearing Failure in reply to Ted, 10-11-2002 22:32:31

Ted -

It sounds like that at high RPM and high thrust loads, the bearing washer is being starved for oil. I have seen this happen before. I would try either filing some (more?) VERY shallow grooves in the thrust bearing (like .015 to .020in deep and on both sides) OR I would look into having the thrust surface of your crankshaft coated with an anti-friction coating. There are quality coatings out there that only require approximately 300 deg F to cure them. Ideally your thrust bearing should rotate at approximately 1/3rd to 1/2 the speed of your crankshaft thus maintaining reasonable surface speeds on both sides of the thrust bearing washer.
If you have an engine with a thrust bearing built onto the main bearing, like some Olivers, then you may have to go straight to the anti-friction coating.

Good Luck,

Goldsburg
goldsburg@att.net

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Ted

10-15-2002 11:26:08

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Re: Re: Crankshaft Thrust Bearing Failure in reply to Goldsburg, 10-14-2002 20:01:05

Thanks for the response! I am glad to see that at least there are other guys that have run into this. I will check into the coating and see what I come up with. Mabee I'll file the grooves in the bearing also and give it a shot. One guy that races NHRA told me that on some of the top fuel engines they have a accumulator that shoots a burst of oil to the thrust bearing when the throttle is opened up- I dont think that that I need to go this dramatic though! Thanks again

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