Re: King Pin Thrust Bearing Clearance

Posted by H.L. Chauvin on Sep. 13, 1998 at 15:25:04

In Reply to: King Pin Thrust Bearing Clearance
posted by Roger Dean on September 13, 1998 at 09:49:34

: I am bench-rebuilding front end - just installed king pins - thrust bearing under head pin turns freely after steel shims --(2 on each side)- have .004" clearance between head of king pin and thrust bearing on one side and .007" on other - advice warns make certain weight of car carried by bearings and not felt washer cup at bottom of assembly - my guess is anything less than about .010" is good because felt washer cup will compress until load is carried by the bearing. But just don't know for sure. Can anyone help??? Thanks.

Hi Roger,

Been there recently -- appears shims, (referred in vendors catalogs as Front Spindle Shims, King Pin Shims, etc.) only sold in 0.010" increments; hence, adding 0.010" shim in 0.07" space tightens thrust bearing and spindle where both will not turn freely. Unless different shim thicknesses available, or other solutions are addressed, assumptions of any play less than 0.010" may be acceptable and correct.Final test is after weight of vehicle placed on axle assembly, whereby if one can rotate thrust bearings with vehicle weight applied, they are not carrying load as they should.RE: page 125, Vol. 3, "How To Restore Your Model A".

Best Wishes,
H. L. Chauvin




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