Differential seal change
Thread Starter
|
New User
Joined: Jul 2001
Posts: 22
Likes: 0
Differential seal change
I need info on how to change the pinion seal on the differential of an 83 F100 with 9" rear (3.5 ratio). Any info or directions would help. Leaks really bad @ the flange. Thanks
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 60
Differential seal change
Are you talking about the pinion carrier or the actual pinion seal?
The pinion seal is fairly straight forward. You'll need to disconnect the driveshaft and the flange (use a long breaker bar or a good air wrench on the pinion nut)
After the nut is off everything can then come apart and take not where they go back.
Drive the seal out with a punch and then lightly tap the new seal into place. Tapping evenly around it.
Put it back together with a new gasket on the carrier.
Josh
The pinion seal is fairly straight forward. You'll need to disconnect the driveshaft and the flange (use a long breaker bar or a good air wrench on the pinion nut)
After the nut is off everything can then come apart and take not where they go back.
Drive the seal out with a punch and then lightly tap the new seal into place. Tapping evenly around it.
Put it back together with a new gasket on the carrier.
Josh
New User
Joined: Dec 2001
Posts: 3
Likes: 0
Differential seal change
Forgive my ignorance but is the carrier the gray nylon plastic seal that covers the seal? The reason I ask is that I've got a 91 F-150 and the differential is leaking at the pinion. I replaced the seal and the leak continued so I thought that I had messed up the seal installing it and replaced it again. Guess what, it still leaks. That little gray plastic thing that fits over the seal appears worn though but I thought that it was nothing more than a dust cover. Is this integral to the sealing of the differential?
Thanks in advance.
Thanks in advance.
Senior User
Joined: Sep 2001
Posts: 109
Likes: 0
Differential seal change
Have seen rears leak thru the spline for the yoke. Remove yoke, clean splines on pinion and yoke, apply small bead of silicone on pinion shaft, small bead on yoke spline, reassemble using torque spec on pinion nut. This should seal any chance of a leak past splines, unless splines are whipped. Don't retighten pinion nut with impact wrench, this will brinell the bearings in the pinion, (been there, done that)use a large ratchet/breaker bar, tighten until no end play on pinion is evident, then give 'er a good tug more. You should be able to feel when you come up against the crush sleeve. Pinion should have a slight drag when turned thru the backlash. If it freewheels it is too loose. If it is too tight, you will know in short order. Things will get hot, or howl, or tear up the gears. Now you have to tear it down for a rebuild. Get a service manual and find as much info as possible before you start if you haven't done this before. Good luck.
Postmaster
Joined: Jul 1999
Posts: 3,172
Likes: 4
Differential seal change
If you have a pinion seal leak the first thing that should be inspected is the vent for blockage . If the vent is clogged the pinion seal is the next easiest way for the pressure to release . Most of the time cleaning a blocked vent tube will stop a pinion seal leak .
Thread
Thread Starter
Forum
Replies
Last Post
88_F0RD
1987 - 1996 F150 & Larger F-Series Trucks
11
Aug 27, 2016 02:22 PM
FS88Bronco
Clutch, Transmission, Differential, Axle & Transfer Case
1
Apr 6, 2005 01:14 AM
highland boy
Explorer, Sport Trac, Mountaineer & Aviator
2
Mar 1, 2005 07:59 PM
