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Injection Pump Timing Adjustment (Spill Timing)
If your engine's fuel injection timing is not properly adjusted, the engine will not operate properly and will be
difficult to start. Have the injection pump delivery rate checked by a well-established fuel injection shop. Ad-
just the injection timing as follows:
NOTE: The fuel shut-off lever must be in the RUN position while making the adjustment or no
fuel will flow from the fuel injection pump.
Refer to the illustration below when servicing the fuel injection pump. First remove the high-pressure fuel
line from between the No. 1 injector and the No. 1 fuel delivery valve holder. Remove the No. 1 fuel delivery
valve holder and remove the delivery valve spring beneath the holder. Reinstall only the delivery valve holder
and reattach the high pressure fuel line to the delivery holder. Attach it so that the end that would connect
to the fuel injector is pointing away from the engine. Fuel will flow from this line during the timing check.
Rotate the engine's crankshaft in its
normal direction of rotation to posi-
tion piston No. 1 at the beginning of
its compression stroke
Move the throttle lever to its full open
position and operate the electric lift
pump. Slowly rotate the crankshaft
clockwise (as viewed from the front),
catching the fuel from the No.1 fuel
line, until the instant the fuel com-
pletely stops flowing (no drips). At
this instant, the 19
0
BTDC timing
mark on the crankshaft pulley
should be directly aligned with the
timing indicator on the front of the
gear case (refer to the illustrations
on pages 70 and 71).
DELIVERY VALVE HOLDER
SPRING
DELIVERY
VALVE
PLUNGER SPRING
FUEL
CONTROL
RACK
TAPPET
If the specified injection timing (19
0
BTDC) cannot be attained, adjust the timing by increasing or decreas-
ing the thickness of shim material under the injection pump's mounting flange to change the injection timing
point. Changing the shim thickness by 0.004 inch (0.01 mm) changes the injection timing by approximately
one degree. To advance the timing, decrease the shim thickness, as required. To retard the timing, increase
the shim thickness, as required. Refer to your generator's Parts List for shim part numbers.
Westerbeke Generators
72
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