Westerbeke BCGB - Valve Clearance Adjustment; Ignition Timing

ENGINE ADJUSTMENTS
NOTE: WESTERBEKE recommends that the following engine
adjustments be performed by a competent engine mechanic.
The information below is provided to assist the mechanic.
VALVE CLEARANCE ADJUSTMENT
NOTE: Retorque the cylinder head bolts before adjusting the
engine's valves (see TORQUING THE CYUNDER HEAD
BOLTS).
1. Remove the rocker cover and gasket.
2. Rotate the crankshaft in the normal direction
of rotation,
placing the No. 1 piston at the top
of its compression
stroke with the exhaust and intake valves completely
closed. Adjust the intake and exhaust valves for No. 1
cylinder, the exhaust valve for
No.2 cylinder, and the
intake valve for
No.3 cylinder (see chart).
3. Rotate the crankshaft
180° in its normal direction of
rotation. Locate the piston in No. 1 cylinder at the top of
its exhaust stroke. Adjust the intake valve for No.2
cylinder and the exhaust valve for No.3 cylinder (see
chart).
CYLINDER #
CRANK ANGLE
1 2 3
When No. 1 piston is set at top of IN
•
•
compression stroke
•
•
EX
When No. 1 piston is positioned IN
•
at top of exhaust stroke
EX
•
4 •• Replace the rocker cover along with a new rocker cover
gasket..
Rocker cover torque: 2.9-5.1 Ib-n (4 - 7 Nm)
VALVE
CLEARANCE
Valve Clearance: Intake 0.20mm (.008 inches)
Exhaust 0.30mm (.0012 inches)
IGNITION TIMING
1. Attach a timing light to the #1 spark plug and mark the
front timing pointer to indicate
1'5°. Locate the timing
mark on the crankshaft pulley and mark it with white
chalk or a crayon.
2.
Start the engine and warm it up to its normal operating
temperature. Make sure the generator is operating without
a load on it.
3. Using the timing light, align the timing mark in the front
crankshaft pulley so it is
just slightly before the fITSt tim-
ing pointer. Do this by loosening and slowly rotating the
distributor body.
Use the following timing specifications:
Timing Specifications: 15' ± .5° BTDC at 1800 rpm
(no load on generator)
IGNITION TIMING
CHOKE SOLENOID
The choke solenoid is a 12 volt DC 9perated unit that func-
tions to close the choke plate in the carburetor when the
ON
switch is depressed during engine start-up.
The choke solenoid de-energises once the engine starts and
the
ON switch is released. Some unstable running may be
present when the engine starts cold but should smooth out
as
the engine reaches operating temperature.
Keep this solenoid
dry and periodically lubricate the linkage
between the solenoid and the choke lever.
CHOKE
SOLENOID
Engines & Generators
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