Westerbeke 8.0KW-60Hz Service Manual page 42

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FUEL INJECTION PUMP
NOTE: Injector pump servicing should be peiformed by a
qualified injector shop.
Disassembly Procedure
1.
Tappet
removal.
a. Hold the injection pump in a vise with the side that has
the tappets up.
b. Straighten the lock plate away from the tappet guide
pin with a screwdriver.
c. Rotate the tappet guide pin 180' to unlock it from the
housing.
d. Remove the tappet guide pin with a needle-nose pliers
while pushing down on the tappet. Remove the tappet.
e. Do Steps (b) through (d) again for the remainder of the
tappets.
A
CAUTION:
The tappet can be thrown from the
housing when the tappet guide pin is removed. Hold the
tappet to prevent it from falling.
2. Plunger removal.
, ,a. Remove the tappet adjusting shim.
b. Remove the ,lower spring seat and plunger with a
tweezers.
c. Remove the plunger spring.
d. Remove the upper spring seat and control sleeve.
e. Do Steps (b) through (d) again for the remainder of the
plungers.
f. Remove the control rack.
3. Delivery valve removal.
a. Thm the injection pump upside down and hold it in
a vise.
b. Remove the delivery valve holder.
c. Remove the delivery valve spring.
d. Remove the delivery valve gasket.
e. Remove the delivery valve with a tweezers.
f. Do Steps
(b)
through (e) again for the remainder of the
delivery valves.
g. Remove the barrels from the housing.
NOTE: When replacing the plungers and barrels or delivery
valves, do not loosen the adjusting plates between the
pumping elements.
After these parts have been replaced, the injection
quantity must be measured. A Pump Tester Cam Box is
needed for the measurement of the injection quantity.
Keep the disassembled injeciion pump parts in clean
diesel fuel.
DISASSEMBLY
SEQUENCE
• AND INSPECTION POINTS ' , '
CHECK THE SPRING
, FOR FATIGUE
'.
' .
A
CAUTION:
The delivery valves, plungers and
barrels are finely finished parts. Keep them as clean as
possible.
Keep the plungers with their respective barrels for
installation. Do not use plungers or barrels with other
barrels or plungers.
Assembly procedure
1. Put each barrel in position in the housing with its slot in
alignment with the dowel of the housing and put it
straight down into the bore.
NOTE:
If
the slot in the barrel is not aligned with the dowel of
the housing, the O-ring will not seat correctly (still visible)
after the delivery valve holder
has
been installed.
2. Install the delivery valve, gasket, spring and O-ring on
the barrel and tighten the delivery valve holder finger
tight. Do this step for the remainder of the delivery
valves.
A
CAUTION:
Anytime the injection pump is
disassembled,
a
new O·ring must be installed.
Make sure the threads of the delivery valve holder do
not cause damage to the O·rings.
WESTERBEKE
Engines & Generators
36
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