Cougar/XR7 V8-4.6L VIN W (1997)
Pinion Bearing: Adjustments
DESCRIPTION
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The absence of differential bearing preload causes noise as driving loads tend to move the gear pattern to the outside (heel) of the ring gear. If the
preload is not set right, it can move out to the edge and score the gears.
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Both the differential pinion bearing and differential bearing preload must be checked so the pattern will stay in place under load.
NOTE: Lower front of axle to perform this check.
PROCEDURE
1. Check the pinion bearing preload by putting a 0-25 Nm (in. lbs.) torque wrench on the pinion nut and measuring the torque effort it takes to turn
the pinion. Compare the reading with the preload specification for used bearings.
NOTE:
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The rear axle drive pinion seal will offer a resistance equivalent to 0.056-0.451 Nm (0.5-4.0 in. lbs.). If the bearings are preloaded, a reading
higher than 0.056-0.451 Nm (0.5-4.0 in. lbs.) on the torque wrench scale must be obtained. If not, there is no preload.
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Another indication is some threads protruding from in front of the nut. Normally about 2.29-2.54 mm (0.090-0.100 inch) of threads protrude if
the preload is set properly. If the nut is flush with the end of the stem, chances are the preload was not set.
NOTE: The absence of preload here may indicate that the differential drive pinion collapsible spacer must be replaced if sufficient pinion nut
torque is not achieved when tightening new pinion nut to desired rotational torque.
2. Tighten the pinion nut, rotating the pinion occasionally to ensure proper bearing seating. Take frequent drive pinion bearing torque preload
readings until the original recorded preload reading is obtained.
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If the original recorded preload is lower than specification, tighten to specification.
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If the preload is higher than specification, tighten to original reading as recorded.
