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Old 03-21-2010, 05:54 PM
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replacing seal

im looking to replace the pinion seal in my 12 bolt. the rear end is already disassembled because i put in new axle seals. What do i need to do to replace this seal? i was told something about replacing the crush sleeve

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Old 03-21-2010, 06:03 PM
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The crush sleeve does not need to be replaced to replace a pinion seal. Only replace a crush sleeve when changing out gears or pinion bearings.

Vince
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Old 03-21-2010, 06:06 PM
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im just replacing the seal but i did remove the axles, pinion shaft, and carrier to replace the seals. then im going to paint and reassemble. so the crush sleeve i have is fine then to put back in?
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Old 03-21-2010, 06:18 PM
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Quote:
Originally Posted by dman0712
im just replacing the seal but i did remove the axles, pinion shaft, and carrier to replace the seals. then im going to paint and reassemble. so the crush sleeve i have is fine then to put back in?
The "trick" is to get sufficient torque on the pinion nut- w/o crushing the sleeve any more.

You could opt for a solid sleeve, adjusted to the length of the crush sleeve. Then you can torque as normal.

Otherwise, use a fresh nut, clean the pinion threads until spotless, and use loctite.
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Old 03-21-2010, 06:49 PM
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how do i know when there is enough torque on the pinion nut?
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Old 03-21-2010, 07:33 PM
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Quote:
Originally Posted by dman0712
how do i know when there is enough torque on the pinion nut?
THAT'S the trick!! lol

When I once had to replace a pinion (whole thing- not just a seal) I did as I explained above, and when the nut got to the "tight" stage, I leaned real heavy on the breaker bar (no impact wrench- I didn't feel I'd have any 'feel' for how tight I was getting it), and when it just felt as though it was going to turn- I stopped.

I cannot tell you that I didn't change the preload any- but I CAN say the diff worked as it did before, w/o issues or any noise, etc.

I suspect if you ever tightened a crush sleeve, you'd know it takes a LOT to get them started, but less to continue crushing them.

Take it easy and I believe you'll be fine.

FWIW, don't change the seal unless it's leaking. A little dampness is normal if the diff has been in service long, and IMHO can be ignored unless there is a leak, not just some "moistness".
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Old 03-21-2010, 09:11 PM
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the thing is i dont know if it leaks. i found some jell stuff at the bottom that looks like it could be sealer. the seal looks fine though.
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Old 03-21-2010, 09:31 PM
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i already have a 10 bolt master rebuild kit. will any of the bearings or seals switch over to the 12 or no?
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Old 03-22-2010, 08:28 AM
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You can tell the point where a crush sleeve crushes. The pinion will turn easily as you are tightening it then you will feel some resistance to turning that is the point at which it crushes. If you had a torque wrench you could measure how much turning force it takes to turn the pinion vs what the spec requires. FWIW, I never use an impact wrench to crush the sleeve, I believe it hammers the new bearings too much. I know lots of people who do use the impact and have never had any problems. I just don't like to do it.

Vince
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Old 03-22-2010, 11:40 AM
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None of the 10 bolt parts will fit the 12 bolt. Did you remove the pinion gear from the housing? If you did then you need to inspect the bearings. Many times a pinion seal will start leaking because a pinion bearing went bad. If this is the case then you need to replace the bearigns and the crush spacer. This will require setting the preload ont he bearings again.

If the bearings are fine and you want to use the origianl spacer again then just use a new nut and torque it to 150 foot pounds. Use Locktite on the threads. Be sure to lube the seal and smear some sealant around the outside of the seal before you drive it in. Also be sure that you smear some sealant into the splines of the pinion yoke before you put it on.
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Old 03-22-2010, 07:58 PM
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is there a way to tell if the bearings bad? i can turn it and it rotates smoothly
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Old 03-23-2010, 08:15 AM
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See if there is any movement other than rotation. If you can move it up and down or in and out even a very little bit then there is a bearing problem, or the nut is loose.
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Old 03-23-2010, 08:23 AM
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Bad pinion bearings can sometimes be a bear to diagnose, especially if the ring gear is still in place. If you also can feel any roughness when you rotate the pinion that is an indication of bearings on the way out.

Vince
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