Engine Adjustments; Govemor - Westerbeke 4.5 BCG Operator's Manual

ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine
adjustments be peiformed by a competent engine mechanic.
The information below
is
provided to assist the mechanic.
ENGINE SPEED (HERTZ) ADJUSTMENT
Governor
The belt-driven, mechanically operated governor maintains
the engine's rpm under various load conditions. Engine speed
determines the hertz and voltage output of the generator.
Governor Adjustments
Operate the generator to bring the unit up to operating
temperature before adjusting the governor.
NOTE: If
the governor is severely out of adjustment, manually
adjust the linkage at no-load to obtain a safe output voltage
before proceeding with the adjustment.
There are three adjusting points on the governor
(see illustration).
1.
Increase/Decrease Speed Adjustment.
This adjusting bolt ·
sets the no-load speed of the engine. (The linkage arm
between the governor arm and throttle lever should be
adjusted to hold the throttle full open when the engine is
not running.) Make sure this linkage moves freely and
that the ball joint connectors are properly lubricated. Use
graphite lube for this purpose. Disconnect the ball joint
and apply graphite lube to the inside of the joint.
2.
Hunting/Regulation Adjustment. If
the variation in
engine speed between no-load and full-load is too great,
adjust this eye bolt to draw the spring closer to the lever
hub. The increase/decrease speed bolt may need to be
adjusted as well.
If
the governor surges under load, adjust this eye bolt to
move the spring away from the lever hub (check speed
adjustment).
3.
Bumper Screw Adjustment.
This screw is used to remove
a no-load surge ONLY. NEVER tum the bumper screw
into the governor so far that it increases the no-load speed.
Governor Maintenance
· 1. Periodically lubricate the linkage arm attaching points at
the governor arm and throttle lever. Use a graphite
lubricant or equivalent
NOTE:
Free movement of this linkage arm is imponant for
proper governor/throttle operation.
2. Governor Oil Capacity: 3 ounces SAE lOW/30 oil.
(Synthetic oil is recommended) Change the oil every 250
operating hours.
NOTE:
Do not oveifill the governor.
3. To change the oil, remove the oil fill plug. Place a small
container under the governor and remove the governor
drallt plug.
Allow the oil to completely drain. Replace the governor
drain plug. Then remove the
alle~
head oil fill level plug
located on the back of the governor. Fill the governor
with three ounces of oil or more until oil ·starts to flow
out of the oil fill level opening. Replace the allen head
plug and the oil fill plug.
LINKAGE ARM
KEEP LINKAGE
WELL LUBRICATED
THRO TILE
LEVER
HUNTING .
REGULATION
ADJUSTMENT
INCREASE/DECREASE
SPEED ADJUSTMENT
4. Periodically adjust the governor belt tension (see DRIVE
BELT ADJUSTMENTS).
Since belts stretch slightly, this
stretching will, to some degree, affect the governor's
action.
Engines & Generators
28