Most Stanadyne pumps, JD included are timed at TDC, end of injection. Actual beginning is in 15 to 20 degree range. Even Bosch inline 4430 running timing is 28 BTDC. TDC is used for timing, but after port closure, beginning injection on # one barrel is found pump cam is turned 14 degrees and mark applied. To help starting Bosch has a retard start notch cut on plunger that only works at full rack travel that closes the port 5 to 10 degrees later depending on how deep it's cut.
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