On The Injection Pump, Shaft. There Is Awoodruf Key With Diffferent Stamps. Apparently The Key , By Size And Stamp, Effect Pump Timing. Does Anybody Know What The Size And Specification Mean As Far As Timing.? Ive Seen .034 Or .036

 

I See The Keys Are Different ...99-200 And 2001-2002?/?

 

I guess your talking about VP44 keys right? Each key is unique to its own VP44 for timing reasons.

 

I Think Each Key Is Somehow Fit To The Truck Year Itself. When Changing The Pump, Dc Wants You To Take The Key Off Of The Original Pump, And Replace The One On The New Pump.
Whats That All About Mike?

 

the key has to do with the pump not the year of the truck ,its installed when the pump is run on a test stand and is aprt of the pump timing