Most Bosch VE rotary pumps have an orifice in the RETURN line banjo bolt, and SOME NH machines return bolt/cap assemblies had a small valve in the bolt. Sometimes that valve will stick, USUALLY from internal parts wear inside the pump that makes it's way toward the return line. Several cold start/run advance systems have been used, and the most common problems are with the advance housing/solenoid models that have TWO small steel lines attached. There's a small C clip that will break inside, USUALLY caused by running out of fuel, or filter plugged. Then, the advance will hammer loudly when fuel starved as air gets into advance area, eventually breaking the C clip. There's also a chance the X drive plate between the cam plate and drive shaft tangs has one "ear" broken, that will make a clicking noise while running, but engine USUALLY won't accelerate when that happens. I saw that on a Case/IH three cylinder VE pump a couple years ago.
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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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