What is a typical pinion bearing preload?
Once the pinion depth has been set, pinion preload must be applied while rotating the pinion. For used bearings, set preload at 15 in. -lbs.; with new bearings, set preload with 25 in. -lbs.
How tight should carrier bearing preload be?
Carrier bearing preload is established by the tightness of the shims. The carrier should be shimmed tight enough that it must be tapped in with a plastic dead blow hammer. If the backlash is too tight, move or add shims to the right side.
How is side bearing preload adjusted?
Manufacturers use shims or threaded adjusting nuts to place a preload on these bearings. Proper preload keeps the case from wobbling inside the carrier and adjusts backlash between the ring and pinion gear. Misadjusted, worn, or faulty side bearings make a growling sound that increases with vehicle speed.
What can happen if the pinion bearing preload was set incorrectly?
The pinion gear rotates at driveshaft speed and can mimic a driveshaft speed-related vibration. Improper pinion bearing preload can cause what appears to be a pinion seal leak, but the seal is fine, the pinion gear is moving vertically, horizontally, or diagonally as is rotates.
What is side bearing preload?
Differentials: Side Bearings Proper preload keeps the case from wobbling inside the carrier and adjusts backlash between the ring and pinion gear. Side bearing preload adjustment is crucial to the differential’s operation.
How do you preload a bearing?
The simplest method of applying preload is to use a wave spring. The spring acts on the outer ring of one of the two bearings. This outer ring must be able to be axially displaced. The preload force remains practically constant, even when there is axial displacement of the bearing as a result of thermal elongation.
How do you measure preload on a bearing?
The required preload, which is expressed as a negative distance, requires measuring total axial positive displacement (end play) of the shaft relative to a fixed surface. This is typically done with a dial indicator.