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On the AMAC manual it is item #25 on page 1
http://cdn.greenmountaingenerators.com/wp-content/uploads/2012/10/Ambac-M50-Diesel-Fuel-Injection-Pump-Metering-MEP002A-MEP003A.pdf
I tore down my pump to rebuild it and notice that it was missing the Thrust Washer that goes between the face gear and pump. It is item #29 in the TM. It appears this would change the backlash in the gearing, but would this have a impact on the timing?
Matt