Help with diff leak

[berg]

So yesterday after 4 runs at santa pod my diff started pissing its oil out

 

It seems to be coming from the diff cover, also has vibration inside when rolling, steering wheel vibrating and can feel it in the seat too which became apparent as soon as i crossed the finish line which is why i checked the car over and noticed the leak

 

Is it possible for a few strip runs to cause so much extra pressure inside to cause the leak or should i be looking elsewhere?

 

The vibration is making me think otherwise

 

I will be removing the diff next week to inspect but im not convinced just sealing the cover will fix the issue

 

I thought just check inside the diff to make sure its good, reseal and maybe have the propshaft checked for balance

 

Any ideas?

[wile e coyote]

Manual or auto?

 

 

[berg]

Manual but I’m using an A02B diff from an auto

 

Seems it’s leaking from the breather on top and also from the cover so I don’t think a blocked breather has caused it

 

I can’t see it being over filled either as I done the fluid when I put the diff in and has covered a few thousand miles without issue

[bignum]

You may have cracked the casing which would also explain the vibration but thats worst case scenario.

[berg]

Fingers crossed it hasnt then

 

Is that what these fancy billet diff covers are all about?

 

Or do you mean the cracked actual diff casing itself and not the cover?

[bignum]

https://www.google.co.uk/search?q=supra+diff+cracked&rlz=1C1GGRV_enGB753GB755&source=lnms&tbm=isch&sa=X&ved=0ahUKEwis6LnSt4fXAhUBahoKHdOdBKsQ_AUICygC&biw=1920&bih=974#imgrc=fDDaMRA07Otb3M:

[Hemanhead]

Fingers crossed it hasnt then

 

Is that what these fancy billet diff covers are all about?

 

Or do you mean the cracked actual diff casing itself and not the cover?

 

Yes, that is why people buy the billet diff covers because they can crack. The smaller diffs are renowned for it apparently hence everyone wanting a bigger Bo3b diff.

 

I bet you were wheel hopping a fair bit off the line.

[berg]

Well dropped the diff out this morning

Thankfully no cracks

 

First thing I noticed was the oil has been coming straight out of the breather, there was no cover on the top of it either just a open hole

 

Is there meant to be a cover or seal on the top to stop fluid coming out of it??

 

Have took the cover off the diff and fully drained it and no signs of any other small parts in there that could have fallen off it

 

Any ideas how these breathers work?

 

 

Edited October 25, 2017 by berg (see edit history)

[Scooter]

I have a couple of diffs in the garage I'll try and get a pic. I do recall from memory they will leak if orientated so the fluid gets to breather ( I think I stored it prop flange up and found that out), but I think there is a plastic/rubber cap so splashing fluid doesn't escape.

[Rob W]

Yes there is meant to be a cover on the top, just looked at pictures of mine when I was replacing the ear mounts.