ZA Oil Pressure Problem

doc37172 · Apr 9, 2011

A few days ago my ZA was running fine and holding 20-25lbs oil pressure. All of a sudden it now starts, builds pressure to 20lbs, but drops quickly to almost zero in 15-20 seconds. It will do this every time I start it. Adjusting the pressure will increase the pressure initially but it still drops in a few seconds. I have changed the gauge, cleaned the crankcase, oil pickup and oil lines of sludge. The oil pump adjustment passage looks good. I'm running a spin-on filter with 30wt oil. My next step is to pull the pump I guess, but I wanted to check here first. If the keys in the pump were broken it wouldn't generate any pressure, right? Any suggestions? I saw this same issue posted a few months ago on a ZT but never saw what the diagnosis or solution was.

doc37172 · Apr 9, 2011

I meant to post this on the MM board

BCnT · Apr 9, 2011

was the crankcase and pickup real dirty? could be the top end is full of sludge and not letting oil return to pan fast enuff.
also there should be a pressure relief valve either on the pump or somewhere on oil system...spring could be getting weak.
one last thing...did you check main and rod bearings while you had pan off?

ZA Oil Pressure Problem

doc37172

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doc37172

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BCnT

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