I wouldn't worry about it. Many of the older in-line pumps either get saturated with diesel fuel - or dry out and sieze plungers. All an in-line pump is - is a set of separate injection pumps - one for each cylinder - riding on a common camshaft. It's the camshaft that requires the oil. As those individual injector pumps get worn, they drip into the camshaft box. No big deal. Drain/check once in a while, refill, and don't worry about it. I've got several in-line Simms and some in-line CAVs - and they all do it. I've also had to unstick many that got run dry. Often - one pump plunger will get stuck and the tractor starts skipping. I've pried many loose with a screwdriver - then filled the cam box with fresh oil - and all worked fine again.
Newer pumps are often more sophisticated and use a common fill from the engine's oil.
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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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