Valve Adjustment/Injection Timing - Westerbeke 12C-TWO Operator's Manual

VALVE ADJUSTMENT /INJECTION TIMING
19°
CRANKSHAFT
PUllEY
TIMING MARKS
TIMING POINTER
Injection Pump Timing Adjustment (Spill Timing)
If your engine's fuel injection timing is not properly adjusted,
the engine will not operate properly, and may be difficult to
start. Have the injection pump delivery rate checked by a
well-established fuel injection shop. Adjust the injection as
follows:
NOTE: The injection pump fuel rack needs to be in the full
fuel delivery position when perfonning this spill timing. To
do this, unscrew the fuel shut off solenoid and remove the
side cover to expose the injection pump fuel rack. Manually
move the fuel rack to the full fuel delivery position (move
fully to the left) secure it in this position then proceed.
1. Remove the high pressure fuel line from between the
No. 1 injector and the No. 1 fuel delivery valve holder.
2. Remove the No. 1 fuel delivery valve holder over
"0" ring and remove the delivery xalve spring beneath
the holder.
3. 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 timirig check.
Rotate the.engine's crankshaft in its normal direction of
rotation to position 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 completely stops flowing
(no drips). At this instant, the(19" BTDC)timing mark on the
crankshaft pulley should be directly aligned with the timing
indicator on the front of the gear case
±
.5 degrees.
If the specified injection timing ( 19" BTDC) cannot be
attained, adjust the timing by increasing or decreasing 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 (0.01mm)
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 Parts List for shim part
numbers.
13
FUEL INJECTION PUMP
PlUNGER