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Found the source of oil on rear brakes.

Posted: Wed Dec 10, 2014 5:00 pm
by Sarge
After many posts, much head scratching, innumerable gaskets, O rings and oil seals, it seems I've been barking up the wrong tree for some time. :(

Cleaned and polished the hub sealing face to within and inch (or should that be 4/1000 of an inch :wink: ) of its life, put in a new gasket, gasket gunk and put everything back together. Tighten and left for half an hour before returning to take off the wheel and re-tighten everything again.

Oil drip noted already :evil:

Rotated hub to check where it was coming from and sort of wish I hadn't.

I know see why I leak oil - there is an eccentric rotation of the hub. At "9 o'clock" everything is snug, but by rotating to "12 o'clock" a gap opens up between the gasket and the sealing faces, about 1mm, which opens and closes during rotation.

Dodgy half shaft ? Issue with my diff ? Just what I didn't need before Christmas :-?

Re: Found the source of oil on rear brakes.

Posted: Wed Dec 10, 2014 5:16 pm
by bmcecosse
Well -you found it... well done ! Swap the shaft in from the other side - just to see if it's ok with that shaft (don't run it like that) . If not - then the problem is in the hub. Or - is it just wear in the bearing?

Re: Found the source of oil on rear brakes.

Posted: Thu Dec 11, 2014 8:43 am
by kennatt
Yes,but does it not close up when the wheel is on and fully tightened up,If it was a permanent fault surely you would feel the wobble because the movement would be transfered to the wheel. Support the back end under the axle,start it up and in gear have a look at the wheels,see if you have a wobble (obviously well supported and front chocked). Or fit the wheel nut and see if the gap closes.My ser11 does exactly the same,if I tip it with the wheels off oil gets into the downwards drum,( No O rings on ser 11).

Re: Found the source of oil on rear brakes.

Posted: Thu Dec 11, 2014 10:10 am
by bmcecosse
I agree - tighten up the 4 wheel nuts (put them on back to front with a couple of washers) - how does it look now? I suspect the bearing is loose in the hub.

Re: Found the source of oil on rear brakes.

Posted: Sun Dec 14, 2014 9:30 am
by Sarge
Seasonal festive duties and work getting in the way of Minor surgery, but I'll let you know how things progress.