D8-2u fuel inj pump

I noticed the other day when I was changing the oil in the gear drive for the fuel injection pump it had diesel mixed in with it. Does anybody know if there is a seal that can be replaced or is this a tight clearance metal to metal machining issue? I know that finding any and all parts for this machine is going to be a problem. ser# d8-2u 12593
Thank you. Steve

The "normal" leakage from the inlection pumps should not accumulate in the oil of the pump housing. There should be a drip line from the housing that carries that leakage away. yhis may be crimped or plugged with dirt etc. These are sometimes T-ed into other drip lines at the front corner of the engine block. Not familiar with that engine as to how they are done.

Could also have a seal between pump housing and filter tower that is leaking. These frequently fill the engine oil pan with fuel though.

Thank you for the info, It leaked just enough to thin out the 30wt oil. That's how I noticed it. Thanks again, Steve