Inspection
Balancer shaft inspectionNOTE: 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, and zero the dial against the front end of the balancer shaft, then pull the balancer shaft firmly back toward the indicator.
Front Balancer Shaft End Play:
Standard (New): 0.10 - 0.35 mm (0.004 - 0.014 in)
If end play is excessive, inspect the retainer and thrust surfaces on the balancer shaft.
Rear Balancer Shaft End Play
Standard (New): 0.06 - 0.18 mm (0.002 - 0.007 in)
If end play is excessive, inspect the thrust washer and thrust surfaces on the driven gear and oil pump housing.
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.
Journal Taper
Standard (New): 0.005 mm (0.0002 in)
6. Measure runout on the No.2 journal of each balancer shaft to make sure the balancer shafts are not bent.
Balancer Shaft Total Indicated Runout
Standard (New): 0.02 mm (0.001 in)
Service Limit: 0.03 mm (0.001 in)
7. Measure the diameters of the balancer shaft journals.
Journal Diameter
Standard (New):
No.1 journal:
Front: 42.722 - 42.734 mm (1.6820-1.6824 in)
Rear: 20.938-20.950 mm (0.8243 - 0.8248 in)
No.2 journals front and rear: 38.712 - 38.724 mm (1.5241 - 1.5246 in)
No.3 journals front and rear: 34.722 - 34.734 mm (1.3670 - 1.3675 in)
Service Limit:
No.1 journal:
Front 42.71 mm (1.681 in)
Rear: 20.92 mm (0.824 in)
No.2 journals front and rear: 38.70 mm (1.524 in)
No.3 journals front and rear: 34.71 mm (1.367 in)
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.
Bearing Inner Diameter
Standard (New):
No.1 journals:
Front: 42.800-42.820 mm (1.6850 - 1.6858 in)
Rear: 21.000-21.013 mm (0.8268-0.8273 in)
No.2 journals front and rear: 38.800-38.820 mm (1.5276 - 1.5283 in)
No.3 journals front and rear: 34.800-34.820 mm (1.3701 - 1.3709 in)
Service Limit No.1 journals:
Front: 42.83 mm (1.686 in)
Rear: 21.02 mm (0.828 in)
No.2 journals front and rear: 38.83 mm (1.529 in)
No.3 journals front and rear: 34.83 mm (1.371 in)
11. Calculate the shaft-to-bearings oil clearances.
BEARING I.D. - JOURNAL O.D. = OIL CLEARANCE
Bearing-to-shaft Oil Clearance
Standard (New):
No.1 front journal, No.3 front and rear journals: 0.066-0.098 mm (0.0026-0.0039 in)
No.2 front and rear journals: 0.076 - 0.108 mm (0.0030 - 0.0043 in)
No.1 rear journal: 0.050-0.075 mm (0.0020-0.0030 in)
Service Limit:
No.1 front journal, No.3 front and rear journals: 0.12 mm (0.005 in)
No.2 front and rear journals: 0.13 mm (0.005 in)
No.1 rear journal: 0.09 mm (0.004 in)