Shimming the gearbox shaft (Ducati ST2)
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- Shimming the gearbox shaft
To establish the total shimming for the primary shaft "SA" and the secondary shaft "SB", proceed as follows:
Measure "A" and "B" on the primary and secondary shafts (on the latter, you must also include the shim adjustment thickness "C" of 2.3 mm);
Measure the depth corresponding to the distance between the contact surface between the clutch side crankcase halves and the chain side and the support surface of the inner bearing raceway for the primary shaft "PA1" and "PA2" and the secondary shaft "PB1" and "PB2";
An axial clearance of 0.25 mm must be obtained, therefore: SA=PA1+PA2-A-0.25 and SB=PB1+PB2-B-0.25.
To establish the size of a single shim, note that:
SA=SA1+SA2 and SB=SB1+SB2 where "SA1" and "SA2 " represent the primary shaft shims on the clutch side and chain side and "SB1" and "SB2" represent the corresponding secondary shaft shims.
This gives:
A similar procedure is used to establish the total shimming "S" for the gearbox drum; given that:
This gives: S=P1+P2-A-0.25.
Given that S = S1+S2, we get S1=P1-59-0.125 and so S2=S-S1.
Measure "A" and "B" on the primary and secondary shafts (on the latter, you must also include the shim adjustment thickness "C" of 2.3 mm);
Measure the depth corresponding to the distance between the contact surface between the clutch side crankcase halves and the chain side and the support surface of the inner bearing raceway for the primary shaft "PA1" and "PA2" and the secondary shaft "PB1" and "PB2";
An axial clearance of 0.25 mm must be obtained, therefore: SA=PA1+PA2-A-0.25 and SB=PB1+PB2-B-0.25.
To establish the size of a single shim, note that:
SA=SA1+SA2 and SB=SB1+SB2 where "SA1" and "SA2 " represent the primary shaft shims on the clutch side and chain side and "SB1" and "SB2" represent the corresponding secondary shaft shims.
This gives:
- SA1=PA1-64-0.125 and SB1=PB1-64-0.125
- and therefore SA2=SA-SA 1 and SB2=SB-SB1
A similar procedure is used to establish the total shimming "S" for the gearbox drum; given that:
- P1 = clutch side casing depth
- P2 = chain side casing depth
- A = gearbox drum shoulder
- 0.25 = axial clearance (mm)
This gives: S=P1+P2-A-0.25.
Given that S = S1+S2, we get S1=P1-59-0.125 and so S2=S-S1.
See this article in russian language
This article has been reviewed: Evgeny Bogomolov
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