Thread: D3 - front diff breather

was able to pull enough of the tube out so I could fit another length of clear hose over it and blow down. This is just straight tube with no breather fitted and I found I could blow very little if at all into the tube. Tiny bit of pressure came back out. I have no idea if you should be able to blow pressure into the diff at all??

Anybody know?

Reading the manual for the diff it shows there is a 90 degree fitting that goes on top of the diff and is described as "breather tube and cap" items 34 & 35.

Would either of these be likely to block?
As my back is damn tender at the moment the last thing I feel like doing is crawling about underneath and pulling access cover off etc.

breather on diff.JPG 34 & 35.JPG

Originally Posted by PeterOZ

was able to pull enough of the tube out so I could fit another length of clear hose over it and blow down. This is just straight tube with no breather fitted and I found I could blow very little if at all into the tube. Tiny bit of pressure came back out. I have no idea if you should be able to blow pressure into the diff at all??

Anybody know?

Reading the manual for the diff it shows there is a 90 degree fitting that goes on top of the diff and is described as "breather tube and cap" items 34 & 35.

Would either of these be likely to block?
As my back is damn tender at the moment the last thing I feel like doing is crawling about underneath and pulling access cover off etc.

breather on diff.JPG 34 & 35.JPG

Unlikely to block in my view, you should not be able to blow through this breather as this would indicate air is getting past the diff output seals. The 90 deg bend would stop any diff oil travelling up the tube.

I would say, as Scarry did above, remove the filler and then try - this way you have somewhere for the air to escape. I agree with Eric, there’s no reason it would get blocked unless you got unlucky and had a critter crawl in and die in there while it was open.