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Hope this information isn't too late:
First: Here is the Wiki link with lots of information: http://www.steelsoldiers.com/showthread.php?62648-MEP-002A-and-003A
Second: For information on the IP better than TM gives:
Selecting Correct Injection Pump Timing Button and Injection Pump...
I can't tell very well from the pictures... But, on mine, I had an oil leak near there also. There is a fitting behind the IP on the block. Look in TM 9-6115-584-24P page 128, Figure 38, Item 32. That was were mine leaked oil. Got the parts to fix it at ACE hardware store.
Don't be afraid of...