I run two a4t-1600's. One has external pump and the other had internal. I replaced the internal pump with a new internal pump but it had a modification to allow extra oil flow to the critical drive gear from cam. This simple modification was made to the oil pump housing. A simple vertical groove about 1/16 deep and about the width of hack saw blade. It is made to the "shank" of oil pump housing to allow high pressure oil from oil gallery to squirt past to lube cam drive. A photo would be great but it's been in service for 15 years since with no issues. Check AGCO Parts for an image. It's a simple and effective next best solution to external pump.
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