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 Post subject: Rear pinion seal
PostPosted: Sun Jul 07, 2013 1:42 pm 

Joined: Sat Jun 14, 2008 1:15 pm
Posts: 142
Location: ohio us
Is it hard to change the rear pinion seal on a 1983 corolla lift back? my is leaking or is this something professional should do ?I really want to learn how too do it rather than pay someone to do it could someone give me a step by step how to do it? Thanks


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 Post subject: Re: Rear pinion seal
PostPosted: Mon Jul 08, 2013 10:36 am 

Joined: Sun May 13, 2012 2:05 pm
Posts: 8
It's not that difficult--in theory. Four bolts to drop the driveshaft, and one big ass nut that holds the pinion flange on, slide off pinion flange, pry off old seal. Install is basically reverse of removal. The tricky parts are:

1) Do you have/can you get a socket for that nut (I forget the exact size, but it is something like 24 or 27MM)

2) Getting the new seal back on without damaging it. If you have changed a seal before, chances are that the shaft you are sealing was not installed at the time (i.e. you remove the axle to change the axle seal, or you remove the hub from the spindle to change the wheel bearing seal). On a diff the pinion shaft is still there, which makes seal installation more difficult.

3) Here is the trickiest part: The procedure for tightening that big ass nut is not to a torque spec, but a preload value. Basically you tighten it until you get a certain amount of resistance when turning it. Too loose or too tight could destroy your diff after a while. What I did on mine several years ago (because I had no way to measure the preload at the time) was to just keep tightening a little at a time (like 1/8 of a turn) until I got a slight increase in drag when turning it. After driving it a bit it got noisy, so I went back under the car and found it was spinning too easily, so I tightened it a little more. After that , it worked fine for years. I just took this diff out last weekend and it still looks great after about 75,000 miles.

I would say you could do it IF you are relatively mechanically inclined, have changed some kind of seal before, AND are open to the possibility of damaging this diff (like you can get another one at a pick a part if you mess this one up). Otherwise have someone do it.

I hope this helps.

Mark


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 Post subject: Re: Rear pinion seal
PostPosted: Mon Jul 08, 2013 3:50 pm 
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Joined: Mon Jul 30, 2012 4:36 pm
Posts: 353
Location: Coarsegold California (around fresno)
Wow. Nice write up with tips. I may be doing this as well. The only thing I can add is: You can take out the carrier / diff and bring it to a shop to save some $$$ rather than having them pull it all out. You can learn about your car while saving $$$.

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