I'm making a new thread, in the hopes one day somebody can find the info easily.

On my new to me 180d-om636 engine. I'm having some wicked IP pump issues. Its all due to old/ bad fuel sitting in it for many years.

This has the bosch Pes4 unit-with the diaphragm on the rear.

Anyway, the rack was jammed up hard. So I loosened all of the delivery valve holders, and removed the diaphragm. With a bunch of spray lube, and a rawhide mallet I got the rack moving very smoothly.

Had all of the delivery valves freed up, and what I thought clean. Put it back together, tightened the holders back down. And the rack jammed again. While leaking down through the little springs inside the cover...

Clearly it wasn't clean enough.

So, how does one disassemble these pumps? -As in to take the valves and rack out? Doesn't really matter if it should come apart. It's gonna happen...

I already popped a known working pump on it. Still haven't got it running though..