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Calculating front bearing shims on the bench
- Thread starter steveg
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Bob_Spidell
Yoda
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There's a lot of variance due to the 'slop' of the bearing rollers in their cage. Usually takes 0.030" of shims, give or take (there are exceptions as noted by others). My guess is your hub will be locked up tight with 0.014" of shims. Please let us know how it goes.
OP
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Ha, Ha - No Nobel Prize after all for my little science project.
One side took .055" of shims and the other took .041". This with new bearings, light oil, and the castellated nut tightened as tight as I could get it. I used the entire Moss kit except for 2@ .003 shims.
Interesting to me is the way the nut works in combination with the two cotter-pin holes which are at 90 degrees. The thread is 16 tpi; one full turn is .0625"; moving from one slot on the nut at one hole 1/12 of a turn until the other hole lines up. That's .005". Therefore when it's too tight and you back the nut off until the bearings rotate easily but without slop, you can theoretically guess the thickness of shims to be added by the amount of rotation of the nut. In practice, though, that's not very accurate. I like the process of putting a lot of shims in then taking them out better than starting off tight as I did and adding shims.
One side took .055" of shims and the other took .041". This with new bearings, light oil, and the castellated nut tightened as tight as I could get it. I used the entire Moss kit except for 2@ .003 shims.
Interesting to me is the way the nut works in combination with the two cotter-pin holes which are at 90 degrees. The thread is 16 tpi; one full turn is .0625"; moving from one slot on the nut at one hole 1/12 of a turn until the other hole lines up. That's .005". Therefore when it's too tight and you back the nut off until the bearings rotate easily but without slop, you can theoretically guess the thickness of shims to be added by the amount of rotation of the nut. In practice, though, that's not very accurate. I like the process of putting a lot of shims in then taking them out better than starting off tight as I did and adding shims.
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That's where I get my muffler bearings and turn signal fluid!
Rob Glasgow
Jedi Knight
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I've used their poka-dot paint for years with very good results. Most can't tell the difference between their single can solution and a professional job. Wish they would expand the color offerings.....
Keoke
Great Pumpkin
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I used these measurements to calculate I need .014" of shims to get the perfect fit.
These dimensions may work for you .However. the machieng tolerances of the distance piece was not precise so variations will be seen car to car.
Consequently,others will be required to follow the book,s instructions to be sure theirs is correct.
These dimensions may work for you .However. the machieng tolerances of the distance piece was not precise so variations will be seen car to car.
Consequently,others will be required to follow the book,s instructions to be sure theirs is correct.