G28/13 Gearbox - Replace Front Seal

[Duckworth]

I have an '87 gearbox sitting out of the car and would like to change out the front seal around the main shaft area. There is a 4 " heavy circlip that sits around an aluminum housing.....but I'm curious if there are many more stages of removal inside the box to allow the oil seal to be replaced...

Lube is coming out of this location consistently...and can be plainly seen.

I would rather not go full overhaul on the box since all the rest of it seems fine.

If DIY is not recommended - what would an average price run for an individual who works with gearboxes - on one seal ?

Shops to visit in Pa...... ?

.....Thanks !!!!!

Phil
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'80 928

[Danglerb]

You need a monster racheting style snap ring tool. Snapon has one in Blue point, and Harbor Freight also sells one.

Be real careful taking that off and putting it back on.

[Duckworth]

Hi Danglerb.....appreciate your feedback (on many areas of 928's).

The snap ring is out - however - the housing (or correct name for it) that is at the perimeter of seal does not seem to budge at all.

Does it receive a push from the inside - or does it draw out with the help of
some grip at the outside ?

Nothing came up on a search here on Pelican....hmmmm.


Wish me luck !

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[vilhuer]

Alu cover around seal can be pulled out using two ears in it. Its held in with o-ring around it but should move when pulled uniformly. There should be some pics in Rennlist archives under my user name.

[Duckworth]

Originally Posted by vilhuer

Alu cover around seal can be pulled out using two ears in it. Its held in with o-ring around it but should move when pulled uniformly...

Vilhuer - a very great thanks to you for chiming in.....I got on rennlist but couldn't find help there.

For anyone who desires to change the seal ...a couple of things to add (after heavy snap-ring is out) to remove the cover housing :

You can't see as you work from the outside, that alum housing has a wall diameter 'depth' that fits snug into the case of the g.box (as well as an o-ring in there). However - the wall clearance of the housing is held tight on it's own - so heat is not a friend here in removal... Also, 'ears' on either side offer little material to 'grab' - so you have to be slow and methodical to massage this out.

WD-40 the perimeter...and my preference was to 'rotate' the housing to get things sliding a little - from years of sitting in one spot...

..Fit a long punch in position at the lower base of the housing - against the raised edge there - and it'll start turning 5 - 10 degrees back and forth. ...Then :

Grab the small 'ears' with long nose locking type pliers - and the method I found useful - pull on one ear at a time - and you'll see slight movement at each side, not much, but enough to basically, start 'rocking' it out.

The gearbox is best put in a horizontal position with your feet up against it.
If progress halts (as mine did) - a small size box wrench over the bolt end of the plier... with taps of a hammer will 'impact' gently one side at a time - until it is out completely....

Then, you can address the oil seal easily.



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[2Quick4u928]

Duckworth,
Where was this leak located exactly when all was in the car? I have a constant leak up near the gearbox area (Aft portion of car near center), but am clueless. Explained the issue to 928 Specialist and they sent me a replacement gasket BUT>>>> I need to get on my PET IPB to see where this particular gasket goes. Hope an easy job, thanks.

[Duckworth]

As long as you can take a strong light and look above the exhaust - you will see
a 'U' shape opening on the bottom center where the gearbox mates to the torque tube.....about 4" above - looking in that opening - you can just make out the seal's location.

That said, it really has to be out of the car - to notice it fully.

One other thing you might try is cut and position some wood to fit in the fin areas across the bottom of the box...below the U shape. After you silicone in the wood, you can cut some thin aluminum 4 - 6" pc and screw it into the wood...creating a shelf basically. Then fold up a rag on top of the shelf to keep the area clean until you're ready for things to come down.


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'80 928