Mainshaft Thrust Clearance Adjustment
Mainshaft Thrust Clearance AdjustmentSpecial Tools Required
^ Mainshaft holder 07GAJ-PG20110
^ Mainshaft base 07GAJ-PG20130
NOTE:
^ Take measurement at normal room temperature.
^ Clean all the parts thoroughly before installation.
1. Remove the 82 mm shim (A) from the transmission housing (B).
2. Install the ball bearing (A), 3rd/4th synchro hub (B), 4th/5th gear distance collar (C), 5th/6th synchro hub (D), distance collar (E), and 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 end of the transmission housing and ball bearing with a straight edge and depth gauge. Measure the at three locations, and average the readings.
4. Measure the distance (2) the depth of the clutch housing with a straight edge and depth gauge. Measure the at three locations, and average the readings.
Shim Selection Formula
5. Select the proper 82 mm shim from the chart. Follow the example below, and use the measurements you made in steps 3 and 4.
(Basic Formula)
(2) - (1) - (0.85 + 0.14) = shim thickness (maximum)
(2) - (1) - (0.85 + 0.21) = shim thickness (minimum)
^ Subtract distance (2) (step 4) from distance (1) (step 3).
^ 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)
21.04 - 17.97 - (0.85 + 0.14) = 2.08 mm (0.082 in.)
21.04 - 17.97 - (0.85 + 0.21) = 2.01 mm (0.079 in.)
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 (044 in.) shims.
NOTE: You may use more than one 82 mm shim to achieve the correct value.
6. Install the selected 82 mm shim (A) in the transmission housing (B).
7. Thoroughly clean the spring washer before installing it on the clutch housing. Note the installation direction of the spring washer.
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.
11. Lightly tap on the mainshaft with a plastic hammer.
12. Attach the mainshaft holder (A) and mainshaft base (B) to the mainshaft as follows:
^ Back out the mainshaft holder bolt (C), and loosen the two hex bolts (D).
^ Fit the 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 plastic 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 end play.
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 may 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.
Standard: 0.14 - 0.21 mm (0.006 - 0.008 in.)