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I would not worry toooooooooo much about the roll pin. Its not a failure seen all that often. I worked on Army gen sets almost 30 years, and never saw that failure.

Good job. And posting pictures is number 1! So few people do that.

Bad oil pump is a rare bear.

Again, good job!

I have known and worked on this type gen set and engine,since 1973. And this engine is used on more equipment then you would even guess. NEVER have I seen this failure. Good job!

Now I see why I was confused. The 3 different gaskets are to compensate for wear in the pump. Looking at fig. #50, I was thinking about a simple gasket between the pump and engine. And could not remember ever replacing one. Having never in my whole time working with this set, never seen a pump...

Indeed. This is where you should start. The by-pass or filter could cause this type of failure. The oil pump itself is very dependable. And, yes, its much easier to check the other things before going to the pump itself.

I am confused. What gaskets? Page #, item # and figure #?

7-13. OIL BY-PASS VALVE. a. Test on Equipment (see figure 7-20). High oil pressure may be caused by the by-pass valve plunger sticking closed. Low oil pressure may be caused by the by-pass valve plunger sticking open. If these conditions exist, clean and inspect by-pass valve. This is from the...