Posted by doc37172 on April 09, 2011 at 04:57:59 from (74.179.245.74):
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.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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