Crankshaft Thrust Bearing Clearance

[mxke]

Curious on your opinion please...
With standard thrust bearings in place, I get 0.008" end float measured with a dial gauge.
This is over the 0.004"-0.006" float in the specs.
The .004" oversize will not go in...probably due to the fact that they are 0.006" over...quality!
Do I:
1) Reorder oversize thrust washers and hope to get something closer to spec? Or slightly under...?
2) Use one oversize and one standard size thrust washer?
If option #2 above, would you put the oversize to the rear or front?
Thanks in advance.
Mike

[abowie]

Frustrating.

Ideally I'd be chasing a correctly sized new washer.

If you plan to reuse an older one I'd put the thick on the front face as it's your foot on the clutch pushing the crank forward that causes some of the wear.

[christopher storey]

There is something in the measurements here which does not add up . If with standard thrusts you have .008 of play, then with a nominal .004 ( but actual .006 ) oversize you should still have .002 of end float. That suggests to me a measurement error somewhere. You have been checking the end float with the main caps fully torqued down ? Or in calculating that the new thrust is out of dimension, have you been comparing it with a worn standard thrust ? before getting desperate, I should start again and re-measure

PS looking at your location, have you been having very low temperatures ? That could just have an effect on the situation

[mxke]

Yes standard thrusts that measure at 0.092" x 2 each = end float of 0.008"
The two oversize thrusts at 0.098" x 2 each = no fit due to 0.012" oversize total.
Hard to fit those thrust washers into a 0.008" space.

Shop is at 60 degrees F, so no temperature effect.

Do I reorder a set of standard thrusts in hope of getting something slightly oversize, or mix a standard and oversize thrust to get the correct clearance?

Not sure a set of proper sized oversize thrust will do the job as they would take up all of that that 0.008" float...(0.004" x 2).

[christopher storey]

Right , Mike - I hadn't appreciated that you have two thrusts over their nominal size . I hesitate suggesting it, but you might try lapping down the backing of the oversize ones with valve grinding paste on a sheet of glass

[ysmalkie]

This is exactly what I asked my machine shop to do.

Right , Mike - I hadn't appreciated that you have two thrusts over their nominal size . I hesitate suggesting it, but you might try lapping down the backing of the oversize ones with valve grinding paste on a sheet of glass

[steve3.8]

All options are possible
I would do option 2 [ one of each ] which should give .002" end float --- that leaves you just .002" to remove to get to the .004" spec ---that could be just a thou off each one which helps to keep them nice and parallel -for that small amount it can be taken off the lead copper.

[mxke]

A generous owner near me had a proper 0.004" oversize thrust bearing. I installed it in the forward position and my end float is now 0.004"
Thank you to all for your assistance!