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No, I don't have any issue with the paper element itself. It is the sealing interface (cork) and the o-ring on the shaft that I don't trust to be 10 micron tight.

The button on the LDS427-2 is a BO901 and all of the rest from LDT to LDS are BO903. Ambac specifies that the BO903 is the replacement for the BO901. The ambac manuals also specify that the replacement buttons must be lapped to the plungers. I have NO doubt that anyone with a couple of...

Measuring vertically from the top of the plunger, the only difference between the plungers is the height of the groove around the plunger; about 0.012 taller on the LDT head. The vertical location of all ports is the same. I don't the means to easily measure the "timing" of the ports.

I appreciate the insight, Rusty. However, both of these pumps had the same maximum governed speed: 2600 rpm. Only the LDS427-2 and LDS465-2 had higher governed speeds (2800 rpm). I like the comparison to a distributor on a gas engine. However, on a distributor, the timing of the spark is...

Probably even less meaningful after noting that the cam determines the injection event and those are all the same.

I have wondered for quite awhile why there is a different hydraulic head on the LDS engines. I wasn't able to find any differences in the military or Bosch documentation. It wasn't clear why a different hydraulic head was specified for such a minor difference in horsepower. I have accumulated...