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Lapping
Lapped bearing noise occurs when fine particles of abrasive materials such as scale, sand, or emery circulate through the oil in the vehicle,
causing the surfaces of the roller and the race to wear away. Bearings that wear loose but remain smooth, without spalling or pitting, are the result
of dirty oil.
Locking
Large particles of foreign material wedged between the roller and the race usually causes one of the races to turn, creating noise from a locked
bearing. Pre-loading regular taper roller bearings to a value higher than that specified also can result in locked bearings
Pitting
Pitting on the rolling surface comes from normal wear and the introduction of foreign materials.
Spalling
Spalled bearings have flaked or pitted rollers or races caused by an overload or an incorrect assembly that results in a misalignment, a cocking of
bearings, or adjustments that are too tight. After completing these checks, refer to the
bearings, or adjustments that are too tight. After completing these checks, refer to the
bearings, or adjustments that are too tight. After completing these checks, refer to the
Check for a knock at low speeds.
Check for a noise most pronounced on turns.
Check for a clunk upon acceleration or deceleration.
Check for a clunking noise in turns.
Check for a vibration.
Check for a noise in the NEUTRAL gear with the engine running.
SYMPTOM DIAGNOSIS
Checks
"Diagnosis Chart"
"Diagnosis Chart"
"Diagnosis Chart"
in this section.
in this section.
in this section.
Action
Replace any worn drive axle CV joints.
•
Replace any worn side gear hub.
•
Correct any abnormalities in the differential gear.
•
Tighten any loose engine mounts.
•
Replace any worn drive axle inboard joints.
•
Replace any worn differential pinion shaft in the case.
•
Replace any worn side gear hub in the case.
•
Replace any worn outboard CV joint.
•
Replace any rough wheel bearing.
•
Replace any bent drive axle shaft.
•
Replace any out-of-round tires.
•
Balance any unbalanced tire.
•
Replace any worn CV joint in the drive axle shaft.
•
Correct an excessive drive axle angle by adjusting the trim
•
height.
Replace any worn cluster bearing shaft.
•
Replace any worn clutch-release bearing.
•
Replace any worn input shaft cluster gears.
•
Replace any worn first-gear/bearing.
•
Replace any worn second-gear/bearing.
•
Replace any worn third-gear/bearing.
•
Replace any worn fourth-gear/bearing.
•
Replace any worn fifth-gear/bearing.
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