Cub Cadet 8454 Service Manual page 40

CHAPTER 2 8454
c. Amount of Fuel Delivery
(A) No fuel delivery
At the engine stop position of the control rack (3), the
lengthwise slot (1) on the plunger (2) aligns with the
feed hole (5). The delivery chamber (4) is led to the
feed hole during the entire stroke of the plunger. The
pressure in the delivery chamber does not build up
and no fuel is forced to the injection nozzle.
(B) Fuel delivery
The plunger is rotated by the control rack and the feed
hole is not aligned with the lengthwise slot. When the
plunger is pushed up, the feed hole is closed by the
plunger. The pressure in the delivery chamber builds
up and forces the fuel to the injection nozzle until the
control groove (6) meets the feed hole. The amount of
the fuel to be forced into the nozzle corresponds to
distance A.
d. Delivery Valve
The delivery valve prevents the fuel in the injection pipe
from flowing back into the delivery chamber and the
fuel in the injection nozzle from dribbling after injection.
2-18
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(1) Slot
(2) Plunger
(3) Control Rack
(1) Valve Spring
(2) Valve
(3) Valve Seal
569W233A
(4) Delivery Chamber
(5) Feed Hole
(6) Control Groove
569W234A
(4) Fuel Chamber
(5) Valve Face
(6) Relief Plunger
D569-W02 May-2003