U joint snap rings PW/WC


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Posted by Kaegi [108.162.246.116] on Thursday, November 16, 2017 at 14:18:52 :

I guy over on the WW2 forum did this home work on new v stock snap rings on Ujoints. WCs us the same as PW so this stuff applies here is the quote:

"I just finished a little empirical research- It has been noted that there is some play to the bearing caps on the replacement U-joints from the usual sources. I myself have noted some movement within the yoke area from a sliding u-joint, and this can cause drivability issues, as well as potential damage... This movement is caused by a problem with the snap rings & grooves in the bearing cap...

I found that using a piece of .040 safety wire, tightly pulled between the inner side of the slot and the snap ring, that it would shim it enough to tighten everything up properly. I dd this to my rear driveshaft a few months ago, but am just getting around to doing the front driveshaft, which was decidedly loose.

While I had it out, I managed to find four original U-joint caps, complete with original c-clips. As suspected, there is some difference. Unsuspected was the difference in the slot I noted

The original clip averages about .094" thick: (This is an average of about 6 different measurements (each) on 4 original, used clips)The original groove on the cap is 0.110" wide, for a clearance between the two of .016" and a cumulative of .032". The new clips are about .073", with the groove 0.116, for a massive clearance on each side of .043! This makes a combined clearance of .086", or just under 1/10th of an inch! No wonder there is so much slop in these u-joints!

I am going to use original clips in the new cap grooves, for a clearance of .022"(. 044 cumulative) or .012 more than originals, yet .021" less (.043" cumulative) than with the new clips. I may still use some .021 safety wire as a shim, but do not think it will really be necessary...

(By "cumulative" I refer to the total movement of the u-joint towards either end cap from all the way one way, to all the way the other.)

These numbers reflect the problem with the caps where they have the attaching clamps- I did not see a need to check the ones which are pressed into the driveshaft side, as they feel tight, with no slip..."




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