Hi all,
My brother has an '85 Jetta with a 1.6L diesel engine. The injection pump is leaking diesel fuel at a pretty good rate (enough to make it not driveable)... It appears to be coming from the bottom of the pump, but I haven't identified exactly where yet. It does not appear to be an injector or line, it is almost certainly coming from the bottom of the pump.
He has a spare pump that is said to be in good working condition. I haven't looked at the spare yet (to see what the bottom looks like), but he says there's a small metal 'plate' on the bottom that looks like it could be the source of the leak on the one on the car... Anyone have any idea as to if that may be the case, and if so, can it be fixed with the pump in place?
Failing that, what's involved with changing an injection pump? Could I just lock the cam in place (as if I were doing a timing belt), then line the replacement pump up using the same tool (a 10mm deep socket IIRC) to align it?
I don't really know how to ask this question, but does everything "happen" inside the pump in one revolution of the gear? In other words, is a fixed point in the rotation of the gear (say the place where you lock it in place when doing a T-belt change) the same on every single rotation? It seems to me that if this is the case, we'd be able to change the pump and 'time' it using the method mentioned above.
Am I on base here, or is there something I'm mising?
Thanks in advance, Craig