mf 50 perkins diesel

on the back (toward seat) of the injector pump on a 3 cyl. perkins is 2 tamper proof adjustments.........one is the high speed and the other is ????


never noticed till today....

Thanks
 
On the cover top rear is the high speed stop screw. There's another screw just below that's the light load advance screw for pumps with that feature. To set it the pump should be on a test stand, but I have set some on engine when tractor is on a PTO dyno. Most engines don't have light load advance, but if it does DON'T tamper with it.
 
thanks......I had not seen a pump with that on it that I could remember. Yes I know better than to adjust anything on a injector pump!
 

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