Torquing The Cylinder Head Bolts - Westerbeke 20.0KW sbeg Operator's Manual

ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine
adjustments be peiformed by a competent engine mechanic.
VALVE CWUlANCE ADJUSTMENT
NOTE:
Retorque the cylinder head bolts before adjusting the
engine~
va/ves. See TORQUING TIIE CYLINDER HEAD
BOLTS.
1. Remove the rocker cover and gasket.
2. Position the No.1 piston at Top dead Center (TDC) of its
compression stroke and adjust the # I and #3 exhaust
calves. While facing the front of the engine, rotate the
crankshaft 360" clockwise and adjust the remaining
valves.
EXHAUST
3. Replace the rocker cover and the rocker cover gasket.
ROCKER COVER TORQUE: 2.9 - 5:1Ib-ft (0.4 - 0.7 kg-m)
4. Adjust all valves to 0.012 (0.30mm) with the engine hot.
~~~rO.0·12(0.30mm)
IGNITION TIMING
1. Attach a digital timing light to the #1 spark plug and mark
the front crankshaft timing groove and the timing mark on
the scale embossed on the engine's front cover.
Each li!!Jing mark represents 2°.
TIMING
CRANKSHAFT
PULLEY
/
/ '
/
2. Start the engine and warm the engine
to
its normal
operating temperature.
3. Using the digital timing light, check the ignition timing
first with the vacuum hose disconnected from the distribu-
tor and then with it connected. Compare timing with the
specifications below. Adjust the timing as needed.
Timing Specilicolions: 16' BIDC 011800 rpm ± I'
(vacuum advance hose disconnected)
33' BIDC 011800 rpm ±1'
(vacuum advance hose connected)
TORQUING THE CYLINDER HEAD BOLTS
After the initial break-in period (approximately 50 hours), the
cylinder head bolts should be re-torqued.
Tighten the cylinder head bolts according to the sequence
shown. Make sure the engine is cold when this is done, and
loosen one head bolt one-half tum and then tighten it
between 43 - 511b-ft (60 -70 Nm). Then proceed to the next
head bolt in the sequence. Tighten the RS (rocker cover stud)
securely.
Engines & Generators
24