In both cases above a stuck injector needle valve could be the cause,if an injector needle valve is stuck in the delivery position it will allow compression to pass out through the injector and into the injector pump causing an air lock in the delivery head of the pump,(you can't do this test if the pump is off the engine)see if you have an injector blowing back,undo the injector pipes at the injectors,put a squirt of oil into each nipple of the injector,protect your face,get someone to crank the engine over on the starter while you watch the injectors,if one blows back that is the trouble,if none blows back the trouble is in the pump,often with a Lucas CAV pump the metering valve can stick in the stop position,the newer pumps with the electric stop usually had a manual lever stop in front of the throttle lever on the top cover of the pump so the engine could be stopped manually,it does not have a cable attached,check it out,if the pump is off do not turn the engine till it's back on again and timed.
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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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