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kingpin shims

  • jayj
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31 Dec 2016 18:52 #176133 by jayj
Replied by jayj on topic kingpin shims
Greetings from Panama,

The upper and lower bearing support the steering knuckle and allow it to turn. Both bearing forces are working together. If one bearing is loose, the other will be loose as they are opposing each other. So if you add one shim, the free-play that is removed will be removed from both bearings.
Yes it is true that by adding shims to either the top or bottom will shift the centerline of the knuckle in relationship to the axle housing, but unless you were adding a mm of shims, the offset is insignificant. The only issue I can see looking at the drawings is the relation of the axle to the oil seal. If the offset is too severe, the oil seal could leak.

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17 Aug 2019 11:31 #212202 by yakuza
Replied by yakuza on topic kingpin shims

jayj wrote: Greetings from Panama,
The only issue I can see looking at the drawings is the relation of the axle to the oil seal. If the offset is too severe, the oil seal could leak.


Most suppliers of lip seals will allow quite a lot of offset as long as there is no throw. A shaft seal should easily cope with an offset of 0.2mm without it being a leak problem. Most seals should manage 0.4mm offset depending on the profile and design.

Especially if you fix the wooble and vibrations by adding a shim the seal will be more comfy :)

The reason for me reading old shim threads is that I am going to my garage to shim up my lower shims just as an quick fix before driving tonight to and from a music festival. I will do it properly later and change the bearings and all as a complete service, but driving yesterday I got fed up with the wobble.
So I am trying to find a tip i saw earlier on just adding shims to the lower pins as a test.. but i couldn't find it, or how much to add so I'll just "gefuhl" it. :)

Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.

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