Originally posted by Julius
The B measurement is not fixed. It's defined by as you say:"the depth of the recess into the 1st gear pinion and the thickness of the thrust bearing and the bearing holder" AND the amount of shims between the steel holder and the thrust bearing!
This is where you set clutch gap on the Centax3 (as it was on the centax2).
After you set the gap you may notice that with bearings etc. installed you can still push the bell onto the clutch shoe. This is where the small shims come in. You put the between the clutch nut and the inner bearing. Make sure you have a little end play (about 0.2mm should be ok).
Julius, we have to define terms. The only purpose of the original calculation, is to determine the shim requirement; the "B" measurement IS fixed, as there are no shims present during the initial measurement process. "B" is modified only by the addition of shims between the thrust bearing carrier and the thrust bearing. If you choose to re-measure after adding a shim, the "B" is no longer "B". It becomes, for example, "BS" (for "B" with a shim). Does this matter? It matters; if "A" is less than 1.7 mm you cannot obtain the clutch clearance of 0.7mm.
Shim = A - B - 0.7
IN the initial measurement
Shim = 0
So,
0 = A - B - 0.7
transposing
B + 0.7 = A
"B" is fixed at 1 mm, so
1 + 0.7 = A
A = 1.7 mm
ANY VALUE OF "A" LESS THAN 1.7 MM RESULTS IN A NEGATIVE NUMBER FOR SHIM REQUIREMENT. FOR EXAMPLE
Shim = A - B - 0.7
Let A' = 1.6
let A = A'
B = 1
Then
1.6 -1 -0.7 = Shim
transposing
Shim = - 0.1 mm
I believe this text is as I remember it from the original Centax clutch instruction (although memory grows dim).
