Hello, To clarify, are you wanting to just replace the individual pumps in the main body? If yes, then yes it can be done without the micrometer....however you will need good eyesight.
Remove the cover of the housing were the rack rides, override the rack oil pressure control. By that I mean remove the 1/8 pipe plug in the housing and insert a rod to trip the oil pressure safety plunger, that then will give you full range on the throttle lever. ( make sure you disconnect the throttle linkage first) Remove one of the injection pumps as per the manual. Now this is were the good eyesight is needed. Look into the hole, move the throttle lever back and forth to count the number of teeth on the rack. Half that number up, then the tooth that makes up that half count, hold the rack so that it stays in the center of the hole. Then center up the teeth on the new plunger and then with the check valve and spring, set the assembly in place. Torque down the retainer ring. For easy assembly, roll the engine as needed to lower the cam lobes in the pump for each cylinder. As for counting the teeth on the rack and holding it on center, I made up a small plate that could bolt onto the pump, located and drilled a hole to match the rack. Then welded a 1/4 nut on the plate. Then used a piece of threaded rod to make contact with the rack, screwed in either direction to move the rack left or right. For safety, have the air filter line removed and be ready with a piece of board, etc to smother the engine incase there is a runaway. I hope this helps, and not confuses you. This plan is a bit rough, however when miles in the field, what do you do ???? Good Luck with it. Dan
