1990 UK spec auto TT

 

Alright so a long time ago I had the subframe/diff off for refurb, removed the diff cooler and pipes (including the area circled in green), blocked them off with bolts, had the diff upside down and drained all the fluid.

 

Fitted it all. Finally got round to filling the diff now with fresh oil. Seen posts saying I'll need upto 2.1L of diff oil for the UK spec model.

 

Now this is where my problem occurs..

 

The normal drain plug (which is square) was very corroded/stuck, hence draining when it's flipped. I was unaware of a filling plug, assuming it is filled from the upper pipe cycled below with the (temporary) wheel nut in it.. where I have now filled about 2.8L worth of fluid and do not see an end in sight..

 

So. What in gods name have I just done to my diff? Are there two areas with two separate fluids?

 

how to upload an image to the internet

 

Damn. Pic link:

https://ibb.co/dCVLmF

Well that could just be the same compartment, the diff is not supposed to be filled completely full as the gears should not be fully submerged. The fill plug is designed so that it is about half way up, and when it starts coming back out the hole, it is full. I would say drain it and refill it to the proper level.

Edited March 23, 20178 yr by Alic

The pipe you have circled is the breather vent pipe. Do not fill from there.

As Alic has lready said the fill plug is approx half way up the diff at the back.

A diff should be filled from there when its level till it starts to trickle a few drops out.

Reckon it'll be okay then if I drain it and fill it with 2.1L?

 

As for the breather, I pulled off a pipe, but googling I see posts about a plastic breather cap?

Reckon it'll be okay then if I drain it and fill it with 2.1L?

 

As for the breather, I pulled off a pipe, but googling I see posts about a plastic breather cap?

Personally i wouldn't chance it as often they have some residue left. Just get a tube and pour in the fill hole until it starts to pour out.

1990 UK spec auto TT

 

Alright so a long time ago I had the subframe/diff off for refurb, removed the diff cooler and pipes (including the area circled in green), blocked them off with bolts, had the diff upside down and drained all the fluid.

 

Fitted it all. Finally got round to filling the diff now with fresh oil. Seen posts saying I'll need upto 2.1L of diff oil for the UK spec model.

 

Now this is where my problem occurs..

 

The normal drain plug (which is square) was very corroded/stuck, hence draining when it's flipped. I was unaware of a filling plug, assuming it is filled from the upper pipe cycled below with the (temporary) wheel nut in it.. where I have now filled about 2.8L worth of fluid and do not see an end in sight..

 

So. What in gods name have I just done to my diff? Are there two areas with two separate fluids?

 

how to upload an image to the internet

 

what you have here is uk diff its not a breather unless some has fitted one that used to link to a oil cooler on a loop when you remove the uk oil cooler you loop the pipes on the diff looks like some one has blocked the holes with bolts

Dan yeah that was me, at the time I saw the bolts as an easier alternative to linking the pipes. Do you think i do not need a breather for the UK diff, or should I get one now that I have blocked them off instead?

Dan yeah that was me, at the time I saw the bolts as an easier alternative to linking the pipes. Do you think i do not need a breather for the UK diff, or should I get one now that I have blocked them off instead?

 

i looped mine so the oil would just push its way round over and over only the uk cars had this i guess you could just blank it the jap cars dont have it i would just loop it

All sorted, cheers for the help.

 

Just for future reference on anyone trying to undo a rusty plug, good ol' WD40 did the trick. Luckily I had time, so I sprayed it every 2 days for 2 weeks and it came off no problemo.

Did you end up blanking off the top and bottom outlet that connected to the diff cooler, or did you join both with a hose?

Diff cooler was removed. I blanked both of them off for now, but I'm looking for a breather plug just incase

All sorted. Blanked both pipes, as is turns out the breather for the UK spec diffs is entirely separate. Quote from Bigh on another forum post when trying to find a part

 

Hi,

 

the two IN/OUTS for the UK diff cooler can be capped off without issues. See attached photo of mine which I have labelled up for you.

 

 

[ATTACH=CONFIG]106582[/ATTACH]

 

Hope this helps?