Pinion seal on 8.2 10 bolt rear end leaking, replaced still leaking?! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-28-2011, 05:21 PM
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Pinion seal on 8.2 10 bolt rear end leaking, replaced still leaking?!

I have a 8.2 10 bolt rear end installed in my 1950 chevy p/u. I had a pinion seal leak and I got around to fixing it this weekend. While I was at it I swapped the 3.73's for 3.08's since the 3.73's were just a little to steep for my application. Anyways, I swapped the gears, replaced the pinion seal and got everything back together. I fired it up and went for a test drive, wouldn't ya know it that damn front seal is leaking just as it was before. Now, I already learned my lesson once on that front seal and I know I am not mistaking oil leaking through the splines between the pinion and the yoke. (it got a healthy dose of RTV) has anyone else had this problem? I am thinking maybe using a seal that fits tighter around the pinion? Any help with this would be greatly appreciated. Hopefully the next time I open up that pumpkin will be the last.

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Old 03-28-2011, 05:34 PM
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Quote:
Originally Posted by artillerystevens
I have a 8.2 10 bolt rear end installed in my 1950 chevy p/u. I had a pinion seal leak and I got around to fixing it this weekend. While I was at it I swapped the 3.73's for 3.08's since the 3.73's were just a little to steep for my application. Anyways, I swapped the gears, replaced the pinion seal and got everything back together. I fired it up and went for a test drive, wouldn't ya know it that damn front seal is leaking just as it was before. Now, I already learned my lesson once on that front seal and I know I am not mistaking oil leaking through the splines between the pinion and the yoke. (it got a healthy dose of RTV) has anyone else had this problem? I am thinking maybe using a seal that fits tighter around the pinion? Any help with this would be greatly appreciated. Hopefully the next time I open up that pumpkin will be the last.
If you replaced the seal with the correct one, I doubt that installing a different one will help. I would check and make sure the vent is not clogged. If the rearend can't vent, pressure will build up and cause a leak.
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Old 03-28-2011, 05:36 PM
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Vent is currently removed, completely. One thing I have not done is try fishing a wire down through the hole in the casting to see if it is plugged there. I will investigate that one. Thank you!
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Old 03-28-2011, 05:49 PM
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The part# you need should be National 8611N. You might make sure you installed the correct seal.

Any grooves on the seal surface of your yoke? Speedy sleeve#99152 if needed

Make sure your pinion is Preloaded correctly.If your pinion is loose,that will cause a leak.

You could always double check and make sure you didnt knock the spring off the seal when you did the install.
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Old 03-28-2011, 06:12 PM
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Sounds like I have some work to do. Thank you for the input. I will let you know what I find out.
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Old 03-28-2011, 06:50 PM
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Make sure the housing is not damaged at the seal bore. I have people make a mess of removing the old seal resulting in the need to glue the new seal in with Right Stuff to stop a leak on the seal OD.
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Old 04-10-2011, 03:57 PM
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seal

check the diff vent. stuff a piece of wire down it and if free put a diff vent back in. otherwise you will get dirt/water in your new parts soon.
when you replaced the gears did you also replace the crush sleeve and do a preload on the pinion bearing properly? otherwise the bearing preload is only being helod by the pinion nut and there is an air gap behind the bearing.is the oil slinger washer still in there behind the seal?
check the wear surface on the yoke, speedisleeve as required.
be sure the seal bore is clean of old seal remains and then install the new seal nice and aquare. a big thick flat washer works well, that the pinion can stick through, then you can use a piece of pipe to hammer on the washer so the seal doesn't get damaged.
see if you can see where the oil is actually coming from, the seal surface or the outside edge of the seal where it fits into the bore.sometimes the bore can get damaged and have some score marks.
good luck,
keep us posted
dsraven
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