Front Axle - 186FIA: Adjustments

General Information/Description / Front Axle - 186FIA
Ring and pinion gears are supplied as matched sets only.

The identifying numbers for the ring and pinion gear are etched onto each gear (Fig. 8). A plus (+) number, minus (-) number or zero (0) is etched into the face of the pinion gear. This number is the amount (in thousandths of an in.) the depth varies from the standard depth setting of a pinion etched with a (0). The standard setting from the center line b of the ring gear to the back face of the pinion is 92.1 mm (3.625 in.).

The standard depth provides the best gear tooth contact pattern. Refer to Backlash and Contact Pattern Analysis for additional information.






Compensation for pinion depth variance is achieved with a select shim/oil slinger. The shims are placed between the rear pinion bearing and the pinion gear head (Fig. 9).

If a new gear set is being installed, note the depth variance etched into both the original and replacement pinion. Add or subtract this number from the thickness of the original depth shim/oil slinger to compensate for the difference in the depth variances.

Pinion Gear Depth Variance Chart:

Refer to the Pinion Gear Depth Variance chart.

Note where Old and New Pinion Marking columns intersect. Intersecting figure represents plus or minus the amount needed.

Note the etched number on the face of the pinion gear head (-1, -2, 0. +1, +2, etc.). The numbers represent thousands of an inch deviation from the standard. If the number is negative, add that value to the required thickness of the depth shims. If the number is positive, subtract that value from the thickness of the depth shim. If the number is 0 no change is necessary.