PAS pump

[Les Henson]

I have a PAS pump that was originally fitted in a 110V8. Although it runs smoothly, there is almost no pressure from it.

Has anyone ever taken one apart, know how they work, are bits available for them, from where, etc etc.

Ta muchly in advance.

Les.

[simonb]

I have a PAS pump that was originally fitted in a 110V8. Although it runs smoothly, there is almost no pressure from it.

Has anyone ever taken one apart, know how they work, are bits available for them, from where, etc etc.

Ta muchly in advance.

Les.

Thought someone had done this and posted pics a while back, clicky link any one???

[David Sparkes]

I haven't contributed on this topic before, (that I recall).

I did lose all pressure one cold morning a year or two back.

After finding out how expensive a new one was, and that no-one had an exchange item on the shelf, I took it from the car and opened it up, without any manuals.

I found, at the second attempt, that the pressure relief valve was stuck open,and obviously It stayed open even while I was manhandling the unit. It released easily enough when prodded in the right place with a screwdriver. I found a polished section on one side of the valve piston, so rotated it to bring another section into use. No further problems.

A ZF pump on a 38A. It seems a lot of pumps are the same, but have an intermediate bracket added to make them fit the 'proper' bracket on a particular engine. That was the case with my BMW diesel anyway. Pump + intermediate braket becomes a BMW part :-))