M/T Main shaft Assembly Clearance Inspection

M/T Mainshaft Assembly Clearance Inspection

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

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





2. Measure the clearance between 2nd (C) and 3rd (D) gears with a feeler gauge (E).

- If the clearance exceeds 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 exceeds the service limit, go to step 5.
- If the clearance is within the service limit, go to step 7.










5. Measure distance (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 exceeds the service limit, go to step 8.
- If the clearance is within the service limit, go to step 10.










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 standard, replace the MBS distance collar.