Does anyone know how to adjust the pressure on an oil pump on a 1991 4.3
litre Astro Van. Someone said there is a spring that has to be adjusted if
so were is it

Thanks Mike

Good news, yes there is a spring that can be shimmed to increase the oil
pressure or put a weaker spring in to lower the pressure.

Bad news, you have to drop the oil pan to get to it. The oil pump can then
be taken off the main bearing cap and taken apart. There is a pin holding
the spring in, that has to be driven out. While you have the spring out you
may as well pull the relief valve out and clean it, chances are you have
dirt in the relief valve, if the problem is truly the oil pump. The other
reason for low pressure is worn bearings.

Hope this helps!


"Mike & Chris" <mammendolia (AT) cogeco (DOT) ca> wrote



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Thanks that's what I thought. I replaced it with a new pump and the pressure
is 50psi instead of 40psi when the engine is warm.

Thanks again Mike
"Doug Adams" <adamsfam (AT) wcnet (DOT) org> wrote