Check my math - FD shim - BMW Luxury Touring Community
 
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post #1 of 5 Old May 14th, 2010, 3:21 pm Thread Starter
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Check my math - FD shim

OK, I got the new bearing, and mounted it up with not much trouble, baked the cover, mounted and measured. Using the HF dial mic, get consistent 12, or .012".
.012 X 25.4 gives me .304 MM. Adding in the required .05 to .1 MM preload, I should be ordering a .35 or .4 MM shim. I'm going with the .35.
Anyone disagree?
I was going to do this via PM to Curtis, but I thought others might want to go through it too. I know I would.
Just FWIW, my old shim is .5 MM

Thanks.
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post #2 of 5 Old May 14th, 2010, 4:30 pm
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Re: Check my math - FD shim

Curious what Curtis says, but I'd go with .35 mm.

I've never read of one with too little preload - which might give a noisier gear set (oh horrors!).
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post #3 of 5 Old May 14th, 2010, 4:38 pm Thread Starter
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Re: Check my math - FD shim

I've never read of one with too little preload - which might give a noisier gear set (oh horrors!).

That's why they put a volume control on the radio!!
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post #4 of 5 Old May 14th, 2010, 6:05 pm
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Re: Check my math - FD shim

For 0.35 mm you'll need to get an 0.20 and a 0.15
The 0.15 is the only size they make in a "half size" so you need to combine it to get the in-between sizes.

2000 K1200LT - 94,000 mi. (49,000 mine since July 4th weekend, 2009)
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post #5 of 5 Old May 16th, 2010, 8:15 am
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Re: Check my math - FD shim

Looks good to me.

Attached is my Exel spreadsheet FD calculator.
Ignore the section for the BMW Service Manual Technique, obviously we don't have the data for those calculations.

Yes, for 0.40mm you'd need only one shim.
For 0.35mm you'll need a 0.20mm shim and a 0.15mm shim.

If your measurements are good, shimming either way would be okay in my opinion.
But, yes, I usually go to the lighter side of preload when the calcluations give me a choice.
Attached Files
File Type: xls fmplt Final Drive Calculator.xls (17.0 KB, 68 views)
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