What should I torque my pinion nut back to?
One Jeep dealership (no longer in business) used to re-use the old crush sleeve when doing a pinion bearing. They would torque the pinion nut back to around 275 foot-pounds, and it seemed to work okay. 500 foot-pounds? Be sure to let us know how long your pinion bearings last. The spec on a crush sleeve isn’t in foot-pounds.
How to remove bearing end play from pinion crush sleeve?
Tighten the pinion nut only enough to remove bearing end play using Tool J-8614-01 and a socket. Rotate the pinion when tightening the nut to seat the bearings evenly. Continue tightening the pinion nut to collapse the spacer and preload the bearings.
How big is the pinion nut on a Yukon?
The Yukon instructions specified 400-500 ft lbs on the pinion nut. Used 500 on the new one and double checked w. two torque wrenches. Still did not compress it enough. On re-assembly, used 500 ft lbs with the old one, checked preload, was okay.
How many pounds does a pinion crush sleeve take?
The spec on a crush sleeve isn’t in foot-pounds. It’s in inch-pounds, and it’s based on tightening (crushing) until it takes 10 inch-pounds (I think, or is it 15?) to turn the pinion. That’s when the preload is set. My shop tech pals tell me it usually takes about 300-foot pounds to achieve that.
When to replace crush sleeve on pinion nut?
Lastly if the pinion nut torque required to reach correct preload is less than 180Nm then the crush sleeve should be replaced. In my opinion crush sleeves shuold not be reused unless you absolutely have to. Generally speaking to much preload will overheat and destroy the bearings.
What happens when you tighten a pinion nut?
While tightening the pinion nut, the crush sleeve compresses to allow the bearings to preload slightly. Too much bearing preload will quickly overheat and cause bearing failure when driven, and too little preload may not allow the bearings to ride properly in the bearing races causing wear and potential failure.
Do you have to preload a pinion nut?
To little and bearings could move, gear alignment will suffer etc. The pinion bearings are just a plain old set of opposed cone bearings on a shaft not too complicated just need to be preloaded enough to eliminate any freeplay under all operating conditions (ie. hot and cold) and not too much that it creates excessive heat.
How much torque to set a new pinion nut?
They also use shims/spacers to set the pinion gear to ring gear depth or alignment. GM torque to SET a new Crush Spacer is 450ftlb (IIRC) since I never had a vehicle lift (you can’t get that kind of torque laying on the ground) I always re-used the Crush Spacer.