Mainshaft Thrust Shim

1. Remove the thrust shim and oil guide plate from the transmission housing.




2. Install the 5th synchro hub (5-speed) or collar (4-speed) and transmission side ball bearing on the mainshaft. Install the assembly in the transmission housing.
3. Measure the distance B between the end of the transmission housing and mainshaft.

NOTE:
- Use a straight edge and feeler gauge.
- Measure at three locations and average the readings.




4. Measure the distance C between the surfaces of the clutch housing and bearing inner race.

NOTE:
- Use a straight edge and feeler gauge.
- Measure at three locations and average the readings.




5. Select the proper shim (or shim pair) on the basis of the following calculations:

NOTE: Do not use more than two shims.

(Basic Formula)
(B) + (C) - 0.95 = shim thickness

Example of calculation:
Distance B (2.01 mm) + Distance C (0.09 mm) = 2.10 mm subtract the spring washer height (0.95 mm) the required thrust shim (1.15 mm)

NOTE: Carry out measurement at normal room temperature.




6. Check the thrust clearance in the manner described below.
1. Install the shims selected in the transmission housing.
2. install the spring washer in the mainshaft.

NOTE:
- Clean the spring washer and shim throughly before installation.
- Install the spring washer and shim properly.

3. Install the mainshaft in the clutch housing.
4. Place the transmission housing over the mainshaft and onto the clutch housing.
5. Tighten the clutch and transmission housings with several 1 0 mm bolts.
6. Tap the mainshaft with a plastic hammer.




7. Attach the collar and shaft holder or the special tool (Mainshaft Thrust Clearance Inspection Tool) to the mainshaft and tighten the three bolts.

CAUTION: Screw the three bolts into the below the spline. Never screw into the splined area.

8. Attach the special tool (magnet stand base) to the clutch housing and set the dial gauge on the top of the mainshaft.
9. Turn the bolt clockwise and measure the clearance.

CAUTION:
- Do not turn the bolt more than 60 degrees after the needle of the gauge stops moving. Be careful not to over tighten.
- Measurement should be made at room temperature.

10. Clearance is correct if the reading is between 0.13-0.20 mm (0.0051-0.0079 in). If not, re-check necessary shim thickness.