Westerbeke WPDS-20 Technical Manual page 51

A28
INJECTION PUMP
Removing
1. Disconnect the battery and remove the engine
cover panel.
2. Remove the high-pressure pipes from the pump
and injectors.
3. Disconnect the throttle return spring from the
pump.
4. Disconnect the throttle and stop controls from the
pump.
5. Disconnect the delivery and return pipes from the
pump.
Data
Injection timing
Method of adjustment:
1. Position No. 1 piston 25° B.T.D.C. com pression
(mark on front face of crankshaft pulley and degree
plate on timing cover).
2. Fit tool 18G 698 in place of the injection pump,
apply gentle clockwise pressure to eliminate chain
slack and set the timing pointer in line with the
mark on the tool as shown.
3. Position the master spline in the pump drive hub
in line with the master spline in the driving flange.
Fit the qUill shaft and injection pump to the engine.
lining up the mark on the pump flange with the
timing pointer.
Governed speed:
Maximum (light running)
Idling
6. Remove the three securing nuts and withdraw the
injection pump and qUill shaft from the engine.
Refitting
7. Reverse the procedure in 1 to 6, noting:
Q.
Time the injection pump to the engine as
described in Data.
b. Bleed the fuel system.
c. Adjust the maximum and idling speeds as
described in Data.
25° B.T.D.C.
3,700 r.p.m. (this gives a maximum speed under load of
3,500 r.p.m.).
500 r.p.m.
Method of adjustment (engine at normal running temperature and air cleaner serViced):
1. Adjust the maximum speed stop screw (1) to give
an engine speed of 3,700 r.p.m. Tighten the lock-
nut, fit the sleeve and seal it with wire and a lead
seal usi ng tool 18G 541.
2. Stop the engine and unscrew the anti-stall screw
(2) until it is out of contact with the governor arm.
3. Start the engine and adjust the idling stop screw (3)
to give an engine speed of 450 to 500 r.p.m.
4. Screw in the anti-stall screw until a slight speed
increase is noticed, then unscrew it one-third of a
turn.
5. Readjust the idling stop screw to give an engi ne
speed of 500 r.p.m. and tighten the locknut.
6. Test the anti-stall screw setting by running the
engine at 3,000 r.p.m. and releasing the throttle:
Q.
If the engine stalls. screw in the anti-stall screw
slightly and re-test.
b. If the engine deceleration is sluggish, unscrew
the anti-stall screw slightly and re-test
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