Opening the dieselpump? (leakage)

[AudiRS]

Hello!
I`ve bought my self this 1993 Audi 80 1,9 TDI 1Z and it got a small leak from the diesel-pump .
It`s seams to be comming from the top of the pump, where I think there is a rubberseal that has failed.
There are 4 bolts to open "the lid", but is it OK to open the pump here? (Don`t want any parts getting loose)
Anyone got a picture/how-to/drawing of how the pump is gathered?

Thx.

[audinut]

yes you can just pop the lid off ,u will need a metalnerd socket though if you want to change the actual leaking seal , and this will require vag com to re adjust the timing


its very easy and there is a full guide on youtube

[AudiRS]

Why do I need to re-adjust the pump? Is`nt this just the "lid" of the pump?
I can take it of without taking the pump out of the car I presume?

The "lid" is seen in the back at this picture I found online(and the failed sealing is showed):

[saltinot]

If you remove the lid only then you will not need to adjust the pump. If you remove the quantity adjuster, which is the part underneath the lid (part in the foreground of the picture above) then you will need to make adjustment. Before you remove the QA you need to make a mark so you can put everything back together close enough to get the car running again and then adjust from there. Don't disassemble without making the marks first.

Normally the leaks occur from three places......the seal between the lid and the QA, the seal between QA and the pump, and at the head (o-ring). You can buy the Bosch rebuild kit for cheap. It includes everything to do the rebuild, I replaced the 3 seals above and binned the rest.

The o-ring on the head is the trickiest one. You can back out the four bolts on the head until you can just see the o-ring. Before you attempt this you will need to turn the crank manually until the pump is loaded up. If you don't, there is a smal shim that will drop out....then you're in for a rebuild of the entire pump. This video should get you started. TDI pump seal replacement

[AudiRS]

Thanks guys! I will try to get the sealings on monday and have it a go!

[audinut]

yes thats what i was saying ... lid ok , but it will be leaking from the other seals ... just change them all bosch keep them in stock , just remember when you remove the centre part to relocate the quantity adjuster in the correct posistion (its easy)

[re2500]

There are YouTube videos that I used to rebuild the pump I found on tdiclub, theyre definitely worth a look before you start.

[AudiRS]

Well, I`ve changed this gasket on the top cover of the dieselpump and got it sealed.
But I can now see that there are pimpeling some drops of diesel out of this red thing in front of the pump. What is that ment for?
And how to make it good again?

[AudiRS]

Anyone know what this red thing in front of the pump is?