Automatic Speed Advance Device Flashcards
Because both the engines ______ and _______ are variable a _______________ must be fitted to dpa type pumps
speed ,load, automatic advance mechanism.
where is the automatic advance mechanism located?
base of the injection pump
an automatic speed advance units consist of what?
a cylinder with two pistons and in between a ball leaver.
explain how each piston operates the ball leaver
one piston is a double action return spring which turns a cam ring to the retard position, the second piston is controlled by fuel pressure from the transfer puml as the engine speed increases which advances the system
what rotates to advance or retard the system.
a cam ring
the rotation of the cam ring forces plunger to do what?
force together earlier
the cam ring returns to the retard position. by the action of the
return spring
