Adjusting Idle Speed; Engine Adjustments - Westerbeke 12C-TWO Operator's Manual

ENGINE ADJUSTMENTS
ENGINE IDLING SPEED
The engine idling speed is pre-set at the factory but once the
boat is operating in the water other variables such as pro-
peller size, shaft length, ahd the transmission can affect the
idle speed.
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THROTILE CONTROL
The normal idle speed for these engine models is 1000-1200
rpm at normal engine operating temperatures. Where ever in
this rpm range the engine operates the smoothest, does not
stall when the throttle is restarted and no damper chatter is
produces. ·
ADJUSTING THE IDLE SPEED
1. Loosen the locknut on the idle adjustment bolt on the
fuel injection pump.
2. Adjust the bolt so that the throttle control lever will
hold the engine at a quiet idle (1000-1200 rpm).
3. Tighten the locknut.
4. Race the engine several times to ensure the idle speed
remains as set.
OPTIONAL FUEL RUN/SHUT-OFF SOLENOID
The fuel run solenoid is mounted in a threaded hole on the
engine's block just aft of and below the engine's injection
pump. Proceed as follows when installing a replacement or
new fuel run solenoid.
1. Visual access to the fuel injection pump's fuel rack is needed.
To obtain this, 'remove the shut off lever and gasket just
below the fuel injection pump.
2. Thread the locknut onto the solenoid and then apply a small
amount of Teflon sealant to the threads on the solenoid
3.
Thread
the solenoid into the hole on the engine and
observe the solenoid plunger through the cover opening. ~
Allow the plunger to contact the fuel rack and move fully
lEVER
into the injection pump. Do not thread further so as to FUEL
RUN
push the plunger into the solenoid.
SOLENOID
4. Back the solenoid out 1/4 - 1/2 of a
tum
and secure it in
position with the locknut
LOCKNUT TORQUE VALUE 28.9-36.2 FT-LB (4.0-5.0 M-KG)
5. Properly connect the three electrical leads from the
solenoid. Two of the connections plug into the engine
harness and the third grounds to the engine block at an
adjacent inbmird threaded hole with an 8mm bolt.
6. Re-assemble the shut-off lever with gasket and test run the
unit. Make certain the unit stops when the solenoid is
de-
energized. If
it does not and only goes to idle. Thread the
solenoid in 1/8 - 1/4 tum till shut-off is obtained.
FUEL RUN SOLENOID
34
FUEL RUN SOLENOID
PUSH TYPE
VOLTAGE: 10V- 15V DC
Coil
resistance is 1.6
n
:t
10% (at 20" C).
STROKE: 0.394
:t
0.0197in (10
:t
0.5mm).
0.394
:t
0.0197in
(10
:t
0.5mm)