Operator`s manual

Valve Clearance Adjustment (W 38B FOUR and W 42B FOUR Engines)
CAUTION
Adjust the valve clearance when the
engine is cold.
Tighten the cylinder head bolts to the
specHied torque before adjusting the
valves. (See page 85.)
\.
TDC MARK Position for
Cylinder.
No.1 and 4
1. Pull off the air breather pipe from the rock-
er cover, and take off the rocker cover
bolts and the rocker cover.
\ ~'"'' '
2. Adjust the valve clearances atTDC (fop TOC MARK ~ ~
Dead Center) for each cylinder when they Po. i t ion for
are on their compression stroke. Remem- C y 1 i n d. r s
berthe engine's firing order is 1-3-4-2. The No.2 and 3
engine's valves must be adjusted in this
order while the
valves are closed. You
may find that turning the engine's
crankshaft is more easily accomplished
when the engine's glow plugs are
removed before the crankshaft is rotated.
CRANKSHAFT
PULLEY
A. Rotate the engine in the normal direction of rotation placing the NO.1 cylinder at the top of its compres-
sion stroke. The TDC mark on the crankshaft
pulley should be in line with the pointer on the front of the
gear case cover, and the
valves for the No.1 cylinder should be closed. Now adjust the intake and ex-
haust
valves for cylinder NO.1.
B. After adjusting the valves for cylinder No.1, rotate the front crankshaft pulley clockwise 180" so the TDC
mark on the
pulley is positioned approximately in the position shown in the illustration shown above for
cylinder No.3. Now adjust the intake and
exhaust
valves for cylinder NO.3.
C. Rotate the crankshaft pulley clockwise
another
180" and adjust the valve clearances
for the Intake and exhaust valves for cylinder
No.4.
D. Rotate the crankshaft pulley clockwise
another 180" and adjust the valve clearances
for the intake and exhaust valves for cylinder
NO.2.
Adjust each valve's clearance by inserting a 0.010
inch (0.25 mm) feeler gauge between the rocker
arm and the
valve stem.
87
ADJUST VALVES TO 0.010 INCHES
(0.25 MMJ
Westerbeke Diesel Engines