Tuesday, August 19, 2008

Changing the rear pinion seal

Last night we replaced the rear pinion seal on Jenny's XJ. Her Jeep has the Chrysler 8.25 rear end. The gear lash of the differential is set partly by the amount of crush on the spacer under the pinion bearing, so changing the seal has the potential to up set the alignment of the gears.

After removing the drive shaft, we carefully marked the nut and the pinion shaft. Then while holding the yoke with a pipe wrench and turning the nut with a socket, we carefully counted the turns required to remove the nut. In our case it was nine turns exactly.

The yoke came off easily with the nut removed. I used a chisel under the metal lip of the old seal to drive it out. After cleaning up all the surfaces, and inspecting the yoke for wear, we installed the new seal.

I used a hammer and a seal driver to press the seal in flat against the differential housing.

We then installed the yoke being careful not to damage the new seal.

We then reinstalled the nut and carefully counted the turns to put it back into the right spot. A little dab of lock tite was put on the threads as a precaution.

After tightening the nut back to precisely the same spot as it came off, I turned it just a little bit more to ensure it was tight.

We then reinstalled the drive shaft and filled the diff with fluid to replace what had leaked out.

A quick test drive shaowed it was all sealed up. No more stinky burning diff lube on the exhaust!

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