Grand Cherokee WJ oil leak rear disc help ?

[pcn1]

Looking at the back of the rear disc brake. Covered in slightly wet oil. What's leaking, how do I stop it ?

Cheers

[Ray Luxury-Yacht]

Heya.

I'm pretty sure your WJ Grand Cherokee uses the same rear axle as my YJ Wrangler - a Dana 35 unit.

Basically - these rigid axle units have differential oil seals either side of the diff unit, which normally stop oil from leaking out of the diff unit, down the axle tubes, and onto the discs / hubs / wheels.

I have had the same problems as you appear to have - oil coming out of the end of the axles.

Means the seals are kaput.

Not a massively difficult job to do at home, depending upon your skill level and that. Means removing the drive shafts, differential unit, and replacing the axle seals. With a manual, this is not a difficult job to do.

If not, then it's a simple job for a competent garage to do - should take them no longer than 2 to 3 hours at most - so your bill (including parts) should be no more than 200 quid at most.

HTH!

[psychoR1]

I have a WJ too and had this problem at the last MOT so yours could be the same. WJ only has an outer diff seal in the hub. You you need to replace the wheel bearing when you do the seal but you can get the whole kit off eBay.
Check my posts for details or pm me.

[pcn1]

psychoR1 said:

I have a WJ too and had this problem at the last MOT so yours could be the same. WJ only has an outer diff seal in the hub. You you need to replace the wheel bearing when you do the seal but you can get the whole kit off eBay.
Check my posts for details or pm me.

PM sent

[psychoR1]

Pm replied

This is the link to the previous thread:

http://www.pistonheads.com/gassing/topic.asp?h=...

[pcn1]

Home made shaft puller. Off to get the new bearing pressed on tomorrow, must do it all in the right order!


[url]


|http://thumbsnap.com/MoaasGLv[/url]

[psychoR1]

Very good - in that first pic the home made shaft puller looks like a moped tho'!

Did it nactually need much of a pull to come out?

[pcn1]

Not too much really, but my "weight" was a bit on the light side so a few whacks !
Went to local metalwork shop to use their press, but its too small
Going to have to ask around local garages now and see if I can get one of them to press the bearing on.

[psychoR1]

I would give it a go then. Just apply even force as it slides on so it doesn't go on the skew!

[pcn1]

So I speak with a neighbor who is a machinist for John Crane (the mechanical seal people) he says He's got a mate local who runs his own machine shop business. We pop around to this hidden gem of an engineers man cave and 10 mins later it's pressed on ! Give the guy a "drink" and he's happy to help out.

This place will come in handy for future use !

Anyway it's all back in now, gave the caliper/park break shoes a good clean and bolt up. Just fitting the polybushes in the control arms and back on the road tomorrow I hope.