Ford 9" leaking on both sides of the pinion retainer - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-16-2011, 10:17 PM
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Ford 9" leaking on both sides of the pinion retainer

There is a leak coming out from under the pinion retainer, that piece with the 5 bolts. There is also a leak on the other side from the seal were the flange comes into the Pinion retainer. So basically both sides of the pinion retainer are leaking.

This is my first time doing this job, so I've been researching online. I've seen a lot about replacing the pinion retainer seal, but none on the o ring replacement. Is it pretty simple?

Am I mistaken about there being 2 seals here?

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Old 09-16-2011, 10:18 PM
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btw I'm getting the part names Im using from this diagram:

http://www.angelfire.com/co3/vintage...ome/fo9dia.jpg
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Old 09-17-2011, 08:22 AM
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Quote:
Originally Posted by adam83
There is a leak coming out from under the pinion retainer, that piece with the 5 bolts. There is also a leak on the other side from the seal were the flange comes into the Pinion retainer. So basically both sides of the pinion retainer are leaking.

This is my first time doing this job, so I've been researching online. I've seen a lot about replacing the pinion retainer seal, but none on the o ring replacement. Is it pretty simple?

Am I mistaken about there being 2 seals here?
You can replace the O-ring by removing the driveshaft, the 5 bolts, and then pulling out the pinion carrier. Just don't lose the shims, they set the pinion depth and are critical for longevity.

Russ
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Old 09-18-2011, 04:54 PM
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Is your differential the same as the picture you posted? My Nova has 9" with the large Daytona carrier, and no "O" ring. I see the picture has the carrier with a built-in bump stop.
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Old 09-18-2011, 08:39 PM
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I'll take a picture and post it.
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Old 09-18-2011, 11:21 PM
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Here it is. I only have the cell phone to take pics with, and it's night time, so this is the best I could do.
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Old 09-19-2011, 05:53 AM
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Are you completely sure that the leak is at the joint and not oil that's wicking along the bolt threads? That oil will ooze and any air flow will spread it all over quite easily. I had a problem with the actual differential retaining stud/nuts on the three bottom after I put mine in the housing.

If it is the retainer seal, while it can be replaced while lying under the car, I believe that I would prefer pulling the entire differential and doing the repair on the bench. It's cleaner and the chances of messing up the new O-ring is much less. Might even consider replacing the pinion seal too.

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Old 09-19-2011, 10:39 AM
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I hosed it all down with Brake cleaner, and let it sit, and I could see oil starting to build up a little in the 2 places I mentioned. Every time I go out to the garage, there is a small but growing puddle under the diff. Im to busy right now to dive into taking the whole thing out. I would like to, but I've never done it before, I dont have help if I need it right now, and if I need special tools I cant afford them at the moment. It's just not in the cards right now.
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Old 09-19-2011, 11:08 AM
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Quote:
Originally Posted by adam83
I hosed it all down with Brake cleaner, and let it sit, and I could see oil starting to build up a little in the 2 places I mentioned. Every time I go out to the garage, there is a small but growing puddle under the diff. Im to busy right now to dive into taking the whole thing out. I would like to, but I've never done it before, I dont have help if I need it right now, and if I need special tools I cant afford them at the moment. It's just not in the cards right now.
If it is just leaking from the Pinion support NO need to remove the whole third member.

Remove the pinion support. Keep the original shim as you will want to reinstall it to keep your pinion depth the same.

Replace the o-ring. I use a little silicone on the o-ring to help with the seal.

Easy fix.
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Old 09-19-2011, 11:14 AM
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Google Ratech# 5102 for the o-ring.
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Old 09-19-2011, 11:40 AM
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I know that they use copper washers on the 10 studs that hold the center section to the axle housing. IF the oil is wicking around the threads on those 5 bolts on your retainer, this might be a possible fix for that as well?

Hmmm ... just had another thought.
Check your diff vent to make sure that it is clean and free. If the diff is pressurizing, it will push oil out the smallest of areas.
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Old 09-19-2011, 02:56 PM
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hey prostreet69, I saw your reply to this same question in another thread, but at what point in these instructions for replacing the O-ring do I replace the pinion seal on the flange?

Remove the 5 pinion support bolt's.

remove assemby.

Remove old o-ring

Clean the oil off pinion support and case

Install new o-ring with sealer

Install assembly

Clean any excess sealer
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Old 09-19-2011, 03:28 PM
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Unless you have access to a lift, that is a tough job while laying on your back with gear oil dripping off your elbows But of course, it can be done

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Old 09-19-2011, 04:27 PM
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Quote:
Originally Posted by adam83
hey prostreet69, I saw your reply to this same question in another thread, but at what point in these instructions for replacing the O-ring do I replace the pinion seal on the flange?

Remove the 5 pinion support bolt's.

remove assemby.

Remove old o-ring

Clean the oil off pinion support and case

Install new o-ring with sealer

Install assembly

Clean any excess sealer
Replace your pinion seal after you get the pinion support out. Make sure you put the pinion preload where it was.When your installing your pinion nut,put a little sealer on the back side of the nut. That will stop any leakage from the center of the yoke.

Dont get the pinion preload too tight!
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Old 09-19-2011, 10:49 PM
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oh crap... I dont know what pre load is...
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