22. Balance Shaft Cleaning and Inspection

Balance Shaft Cleaning and Inspection

Repair Procedure




1. Remove the No. 1 taper head screw plug.
2. Inspect balanceshaft thrust clearance.
3. Inspect balanceshaft oil clearance.




4. Remove the balanceshafts (1, 2).
5. Install the balanceshafts.




6. Using a dial indicator (1), measure the thrust clearance while moving the balanceshaft back and forth.

0.05 to 0.09 mm (0.0020 to 0.0035 in)

0.09 mm (0.0035 in)

7. If the thrust clearance is greater than the maximum, replace the balanceshaft housing and bearings. If necessary, replace the balanceshaft.
8. Clean each bearing and journal.
9. Check each bearing and journal for pitting and scratches. If a bearing or journal is damaged, replace the bearings. If necessary, replace the balanceshaft.
10. Place the balanceshafts onto the crankcase.




11. Lay a strip of Plastigage (1) across each journal.

Note: Do not turn the balanceshafts.

12. Install the balanceshaft housing.
13. Remove the balanceshafts.





Note: Remove the Plastigage completely after the measurement.

14. Measure the Plastigage (1) at its widest point.

0.022 to 0.049 mm (0.0009 to 0.0019 in)

0.049 mm (0.0019 in)

15. If the oil clearance is greater than the maximum, replace the bearing. If necessary, replace the balanceshaft.
16. If replacing a bearing, select a new one with the same number.




17. Inspect the balanceshaft housing bolts.
18. Using vernier calipers, measure the length of the bolts from the seat to the end.

58.3 to 59.7 mm (2.295 to 2.350 in)

60.3 mm (2.374 in)

19. If the bolt length is greater than the maximum, replace the balanceshaft housing bolt.