Balance Shaft: Testing and Inspection

NOTE: Inspect the balancer shaft before removing the right side cover and the balancer gear case.

1. Push the balancer shaft firmly away from the dial indicator. Zero the dial against the front end of the balancer shaft, then pull the balancer shaft firmly back toward the indicator.





- If end play is excessive, inspect the retainer and thrust surfaces on the balancer shaft.





- If end play is excessive, inspect the thrust washer and thrust surfaces on the driven gear and oil pump body.

NOTE: The thickness of the retainer (front) and thrust washer (rear) are fixed and must not be changed either by grinding or shimming.

2. Remove the balancer shafts.

NOTE: Clean the balancer shafts.

3. Inspect the surface of the balancer shaft journal and balancer bearing.
4. Replace the bearing or balancer shaft if there is wear, damage or discoloration on the surface of the bearing or the balancer shaft journal. When replacing the rear No. 1 bearing, be sure to replace the oil pump housing with a new one.

NOTE: A mirror-like surface is normal.





5. Measure taper at the edges of each journal.
- The difference between measurements on each journal must not exceed the standard.





6. Measure runout on the No. 2 journal of each balancer shaft to make sure the balancer shafts are not bent.








7. Measure the diameters of the balancer shaft journals.
8. Remove the crankshaft, the pistons and the other parts from the block, then clean the balancer shaft journal bearings in the block and the oil pump housing with a clean shop towel.
9. Check the surface of the bearings; if there is wear, damage or discoloration, replace the bearings or the oil pump housing.











10. Measure the inner diameters of the balancer shaft journal bearings.





11. Calculate the shaft-to-bearings oil clearances.