M/T Mainshaft Assembly Clearance Inspection

M/T Mainshaft Assembly Clearance Inspection

NOTE: If replacement is required, always replace the synchro sleeve and the synchro hub as a set.

1. Support the bearing inner race with an appropriate sized socket (A), and push down on the mainshaft (B).

2. Measure the clearance between 2nd gear (C) and 3rd gear (D) with a feeler gauge (E).
- If the clearance is more than the service limit, go to step 3.

- If the clearance is within the service limit, go to step 4.










3. Measure the thickness of 3rd gear.
- If the thickness is less than the service limit, replace 3rd gear.

- If the thickness is within the service limit, replace the 3rd/4th synchro hub and the 3rd/4th synchro sleeve as a set.










4. Measure the clearance between 4th gear (A) and the 4th/5th gear distance collar (B) with a dial indicator (C).
- If the clearance is more than the service limit, go to step 5.

- If the clearance is within the service limit, go to step 7.










5. Measure the length (1) of the 4th/5th gear distance collar as shown.
- If the length (1) is not within the standard, replace the 4th/5th gear distance collar.

- If the length (1) is within the standard, go to step 6.










6. Measure the thickness of 4th gear.
- If the thickness is less than the service limit, replace 4th gear.

- If the thickness is within the service limit, replace the 3rd/4th synchro hub and the 3rd/4th synchro sleeve as a set.










7. Measure the clearance between the 4th/5th gear distance collar (A) and 5th gear (B) with a dial indicator (C). If the clearance is more than the service limit, go to step 8.










8. Measure the length (2) of the 4th/5th gear distance collar as shown.
- If the length (2) is not within the standard, replace the 4th/5th gear distance collar.

- If the length (2) is within the standard, go to step 9.










9. Measure the thickness of 5th gear.
- If the thickness is less than the service limit, replace 5th gear.

- If the thickness is within the service limit, replace the 5th synchro hub and the 5th synchro sleeve as a set.










10. Measure the length of the MBS distance collar.
If the length is not within the standard, replace the MBS distance collar.

Standard: 24.03-24.08 mm (0.946-0.948 in.)