Leaky gear diff B5M

[andrewc]

Hi all

Would have put this in Associated thread but hope there might be feedback from other brand users.

As title; gear diff, leaking. Not completely emptied itself by any means, but enough to give transmission a good coating and a very slight seepage (oil stain rather than oil as a liquid) through transmission casing joints.

Similar situation for a few B5M's at our club; all decent car builders too. Some were fine first time built, and have deteriorated with several oil changes (to be expected with paper gasket) others have leaked since first build.

Varying oil thickness, mostly very light though, 1-3000. All filled to cross pins as per instructions, cranked down opposite screws in sequence etc.

I'm considering using blue hylomar as an alternative to paper gasket, but would be interested to hear thoughts of others on here about alternative solutions?

Thanks in advance

[HOTSHOT III]

Not sure about the B5M but on the RB6 the paper gaskets are very thin, so perhaps you could use 2 or 3 as long as it doesn't adversely affect the internal gear mesh.

[Pitman Ed]

We've run a few meetings with the gear diff in our B5M with 3K Team Ass. oil. I opened the case yesterday with the intention of going thicker as the inside wheel is diffing out more than I'd like. I was surprised to find the same result - everything in the gearbox coated with oil. Fill level as per instructions - top of cross pins.

I built the diff correctly I thought, and Andrew's report suggests it's a common feature. Cars are running hot on outside tracks at the moment with this nice weather, and I wonder if the relatively thin 3K oil is not helping. Anyway I've used 10K now and we'll try that at the weekend (outside astro).

I've noticed that even after spilling what looks a lot of oil, the diff felt very similar to when it was full. So maybe using slightly less oil is key.

Let's hear some advice from SC10 gear diff users - I think the diffs are the same design.

[h0m3sy]

When I had my b5m, I built the diff as per instructions as well but I used to get a cotton bud and apply a thin layer of this stuff on top of the paper gasket before screwing the top on. I used to do the same when building my 1/8 scale diffs. Never had one leak yet.

http://pages.ebay.com/link/?nav=item...d=380986612180