M/T Main Shaft Thrust Clearance Adjustment

M/T Mainshaft Thrust Clearance Adjustment

Special Tools Required

- Mainshaft Holder 07GAJ-PG20110
- Mainshaft Base 07GAJ-PG20130

NOTE:

- Take measurements at normal room temperature.

- Clean all parts thoroughly before installation.

1. Remove the 87 mm shim (A) from the transmission housing (B).






2. Install the angular ball bearing (A), the 3rd/4th synchro hub (B), the 4th/5th gear distance collar (C), the 5th/6th synchro hub (D), the 6th gear distance collar (E), and the angular ball bearing (F) on the mainshaft (G), then install the assembled mainshaft in the transmission housing (H).

NOTE: The angular ball bearing is directional. If installed the wrong way, the measurements will not be accurate.





3. Measure the distance (1) between the rim of the transmission housing and the angular ball bearing with a straight edge and a depth gauge. Measure at three locations, and average the readings.

4. Measure the distance (2) (the depth of the clutch housing) with a straight edge and a depth gauge. Measure at three locations, and average the readings.






Shim Selection Formula

5. Select the proper 87 mm shim from the table. Follow the example below, and use the measurements you made in steps 3 and 4.

(Basic Formula)





- Subtract distance (1) (step 3) from distance (2)(step 4).

- 0.85 mm (0.033 in): Spring washer, a dimension in the installation.

- 0.14 mm (0.006 in): Minimum thrust clearance.

- 0.21 mm (0.008 in): Maximum thrust clearance.

(For example)





Take the middle value 2.04 mm (0.080 in) of the minimum value and the maximum value, and select the 0.93 mm (0.037 in) and 1.11 mm (0.044 in) shims.

NOTE: It is acceptable to select two 87 mm shims and put them together to get the required thickness. Make sure the washers are clean and dry to achieve an accurate measurement.

87 mm Shim





6. Install the selected 87 mm shim (A) in the transmission housing (B).






7. Thoroughly clean the 64 mm spring washer (A) before installing it on the clutch housing (B).

NOTE: Be sure to install the spring washer in the direction shown.





8. Install the assembled mainshaft in the clutch housing.

9. Place the transmission housing over the mainshaft and onto the clutch housing.

10. Tighten the clutch and transmission housings with several 10 mm bolts.

NOTE: It is not necessary to use sealing agent between the housings for this procedure.

11. Lightly tap on the mainshaft with a soft face hammer.

12. Attach the mainshaft holder (A) and the mainshaft base (B) to the mainshaft as follows:

- Back out the mainshaft holder bolt (C), and loosen the two hex bolts (D).
- Fit the mainshaft holder over the mainshaft so its lip is toward the transmission.
- Align the mainshaft holder lip around the groove at the inside of the mainshaft splines, then tighten the hex bolts.





13. Fully seat the mainshaft by tapping on its end with a soft face hammer.

14. Thread in the mainshaft holder bolt until it just contacts the wide surface of the mainshaft base.

15. Zero a dial gauge (A) on the end of the mainshaft.





16. Turn the mainshaft holder bolt (B) clockwise; stop turning when the dial gauge has reached its maximum movement. The reading on the dial gauge is the amount of mainshaft thrust clearance.

NOTE: Do not turn the mainshaft holder bolt more than 60 degrees after the needle of the dial gauge stops moving. Applying more pressure with the mainshaft holder bolt could damage the transmission.

17. If the reading is within the standard, the clearance is correct. If the reading is not within the standard, recheck the shim thickness.