Engine Adjustments; Valve Clearance Adjustment - Westerbeke 8.0KW-60Hz Service Manual

ENGINE ADJUSTMENTS
VALVE CLEARANCE ADJUSTMENT
Make the following adjustments when the engine is cold.
a. Remove the cylinder head cover.
b. Slightly loosen the cylinder head bolts and retighten them
to the specified torque in the number sequence shown
below.
TIGHTENING TORQUE 65
±
4lb·ft (88
±
5 Nm)
010
04 02
05
O?
•
4 CYLINDER
OS
06
01
03
014 012 011 013
FOUR
FRONT
04 02
07
3 CYLINDER
010
01
09 03
THREE
c. Find top dead center compression position for No.1
piston by llsing the procedure that follows:
d. Turn the crankshaft until
IDe
mark on the crankshaft
pulley is aligned with the mark on the timing gear case.
TOC (TOP DEAD CENTER)
MARK FOR NO.1
AND NO.4 PISTONS
,\,
\
~
,
\
, I
~
..
~
TOC MARK FOR
NO.2 AND NO.3 PISTONS
TIMING GEAR
CASE MARK
e. With No.1 piston at top dead center on the compression
stroke, the rocker arms will not be moved when the crank
shaft is turned approximately 20° in both directions.
f. If the rocker rums move, No.1 piston is at top dead center
on the intake or exhaust stroke. In such a case, turn the
crankshaft 360
0
in the direction of engine rotation again.
No.1 piston is now at top dead center on the compression
stroke.
g. Loosen the locknut for the adjusting screw. With a feeler
gauge inserted between the rocker arm and valve cap,
adjust the valve clearance by turning the adjusting screw.
Make certain to adjust all the valves.
I
%;\''''''~i1
:
O.25rnm
-----1C
(0.0098 INCHES)
-
~ INTAKE
& EXHAUST
h. Hold the adjusting screw and tighten the locknut.
i. After the valve clearance on the valves for No.1 cylinder
has been adjusted. turn the crankshaft 180' in the
direction of engine rotation and adjust the valve clearance
on the valves for the remainder of the cylinders in firing
order (injection sequence),
INJECTION SEQUENCE:
3 1·3·2 240
0
CRANKSHAFT ROTATION
4 1.3-4-2180
0
CRANKSHAFT ROTATION
j. After the valve clearance on the valves for all the
cylinders have been adjusted, tum the crankshaft two or
three times and make certain the clearance is correct.
k. Install the cylinder head cover.
HEAD COVER BOLT TORQUE 2·3 ft·lb (0.3 . 0.45 m·kg)
Engines & Generators
47