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Mustang Technical Discussion > Pre 1973 > leaking pinion seal > Community Forums > Mustang Forum Australia - Mustang Tech

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seany-boy
Junior Mustang

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Joined: Aug 28, 2011
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About 3 years ago I had the 9 inch rebuilt and it has recently started weeping a little oil from the bottom of the pinion seal- or it has always wept a bit but it has become more noticeable recently.
Still not terrible but enough to be annoying, so a couple of questions.
1. Is this expected after such a short time relatively given the low mileage since rebuild?
2. do I need to worry about it?
3. Can I easily change it myself or should I get it done? i have read it is easy but then read the to do it properly I need an inch-foot torque as well as a pound-foot torque and it seemed a little complex.

Any advice welcome.


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jas24zzk
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Joined: Jan 23, 2011
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Its easy when you have done one.........so they say.

They all pretty much leak, regardless of type...ie Ford/holden etc.

The hardest part of doing this, is the resetting of the pinion tension as you have read. Once you do that, then you need to remesh the pinion and crown wheels. a laborius task at the best of times. get it wrong any you'll be up for a new gear set very quickly.

Personally, i'd clean things up and pay attention to how much you are using. Even logging how much you needed to add during service and get a history going. I.e a sharp rise in the usage/loss = time to do something more about it than keeping it clean.

However, if it is already spraying oil all over the underbody, then its probably time to have it looked at.

There is nothing automotive that scares me, but auto's and diffs I definately leave to the guys that do those. They are specialists for a damm good reason.

Jas


Jason Pigdon
Pigdon Automotive Services
Historic Smash Specialists
3/1 Burgess Road, Bayswater Nth, Vic.
(03) 9761-4801

PS: Forgive me for I was jilted by peterp

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Shaunp
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Joined: Jul 29, 2010
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Centre punch the pinion shaft , yoke and nut so you can match them, then count the number of turns you undo the nut. As long as you do recrush the spacer it will be fine.


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seany-boy
Junior Mustang

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thanks guys,

appreciate the advice. not spraying yet Jas just making my diff a bit messy so I will do as you suggest. just get sick of re-doing things that I paid to get done!- had the same thing with a/c compressor leaking after 18 months!
I will monitor it then follow Shaun's instructions if it gets worse.


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Shaunp
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Just make sure you get exact you can't go past the centre pop and come back , you get one go at it.


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seany-boy
Junior Mustang

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Thanks Shaun,

i will monitor the oil usage first before I decide to try anything Smile


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jas24zzk
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Seany,
it may be as simple as it may have been overfilled after rebuild. Although there is plenty of room for expansion within the diff housing, that doesn't mean a lot when a seal is subjected to withholding the 'dam' when it wasn't designed to.

If you are going to trend monitor it, then you need to be very accurate as to the cars position when you jack it up to get under. I.e if you jack the back up and top it off, then you are now overfilling. You need the car to be at the same level every time, and that should be level.


Remember oil is cheap Smile

(so is a rag)


Jason Pigdon
Pigdon Automotive Services
Historic Smash Specialists
3/1 Burgess Road, Bayswater Nth, Vic.
(03) 9761-4801

PS: Forgive me for I was jilted by peterp

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seany-boy
Junior Mustang

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Smile gotcha


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