Pinion Depth

PINION DEPTH

Special Tools:










PINION DEPTH VARIANCE





Identifying numbers for the ring gear and pinion are marked on the pinion (1)(Figure 1). A plus (+) number, minus (-) number or zero (0). The pinion depth variance/deviation (1) is the amount the depth varies from the standard depth setting of a pinion marked with a (0). The standard depth provides the best gear tooth contact pattern.





The pinion depth is set by selecting the shim (1)(Figure 2) that fits between the pinion housing and the axle housing.

PINION DEPTH MEASUREMENT





1. Install arbor disc (1)(Figure 3) into differential cover (2).





2. Install arbor disc (1)(Figure 4) into differential case.





3. Install arbor bar (1) into arbor disc.





4. Install O-rings (1)(Figure 6) on arbor bar.





5. Install cover (1)(Figure 7) to housing.
6. Install and torque cover-to-housing bolts to:
- M10x40 - 65 Nm (48 ft. lbs.)
- M8x25 - 34 Nm (25 ft. lbs.)





NOTE: Make sure gauge plate surfaces are clean to insure an accurate reading

7. Install gauge plate (1)(Figure 8) to pinion opening.





8. Install plate-to-housing bolts (1)(Figure 9).





9. Install Scooter Block (2)(Figure 10) and dial Indicator (1) on gauge plate (3).





10. Zero dial indicator (1)(Figure 11).





11. Take reading (1)(Figure 12) with the dial indicator, measure gage rod protrusion.
12. Record gage rod protrusion reading on the dial indicator. The dial indicator reading represents the amount that this particular assembly deviates from the design height.

PINION ASSEMBLY HEIGHT MEASUREMENT





1. Install measuring sleeve (1)(Figure 13) over pinion assembly (2).





2. Install Scooter Block (2)(Figure 14) and dial Indicator on (1) measuring sleeve (3).
3. Record reading on the dial indicator. The dial indicator reading represents the amount that this particular assembly deviates from the design height.

SHIM CALCULATION





By adding the sum of the above readings you will be able to determine the correct shim needed.

Your base line shim will be 2.047 mm, add this to the pinion depth variance/deviation (1)(Figure 15). The variance/deviation marking on the pinion head in 0.01 mm increments. Therefore, for the graphic shown, 0.03 mm (0.0012 in.) would be added to the shim thickness.





Add your dial indicator reading measurement for pinion height (1)(Figure 16).





Add your gage rod protrusion measurement (1)(Figure 17).





The sum of the above will be the shim size needed (1)(Figure 18).