Partial Reassembly; Installation Of Cylinder Head Assembly; Valve Clearance Adjustment - Westerbeke 38B FOUR Service Manual

CYLINDER HEAD SERVICE
Partial Reassembly
1. Press in the valve guides to the specified height. (For the
installation procedure, see Valve Guide.)
2. Install the valve stem seals securely on the valve guide.
3. Apply oil to the valve stems and insert them into the
valve guides. Install the springs, retainers and retainer
locks in that order.
4. To assemble the rocker arms and shaft, place the rocker
shaft in such a manner that the identification mark (4)3
mm hole) at the front end of the shaft faces toward the
front of the engine. Install the front-most rocker arm and
retain it with a snap ring. In a similar manner, install the
other rocker arms, one after another. Finally, install the
rear-most rocker arm and retain it with a snap ring. Then
install the assembly on the cylinder head. When tighten-
ing the front and rear stays, be sure to install the bolt
seats and washers.
IDENTIFICATION MARK
• FRONT·
INSTALLING ROCKER ARMS
O~
ROCKER SHAFT
S. Tighten the glow plugs to the specified torque.
6. Install the nozzle holders and tighten the bolts temporar-
ily. After installing the high pressure injection lines,
retighten the bolts evenly to the specified torque. Do not
reuse any sealing washers.
7. Install the glow plug lead wires. (The glow plugs are a
taper sealed type; they do not require gaskets.)
Installation of Cylinder Head Assembly
1.
Install the cylinder head assembly with a new gasket. The
gasket does not require any sealant.
2. Tighten the cylinder head bolts to the specified torque in
the numerical order shown in the illustration. Start with a
slight torquing of the bolts, and after two or three stages
of moderate torquing, finally tighten to the ,specified
torque (see TECHNICAL DA1A). (Be sure to use a torque
wrench.) ,
<:J
~F_RO_N_T
____________
~
______________
~
,O®
CD
(~y
@
®
®
CYLINDER HEAD BOLT TIGHTENING SEQUENCE
(See Engine Adjustment section)
3. Be sure to use only new gaskets and packings. Apply
sealant to the specified sealing points.
Valve Clearance Adjusbnent
Position the piston in #1 cylinder at the top of its compres-
sion stroke. Observe the valves and timing mark on the front
crankshaft pulley (T.D.C.) when doing this. Adjust the valve
clearances for cylinder #1. Rotate the crankshaft 90° in the
normal direction of rotation (clockwise) and adjust the valves
for the next cylinder in the engine's firing order, cylinder #3.
Rotate the crankshaft another 90° and adjust the valves for
cy linder #2.
NOTE:
For additional information, see Adjusting Valve
Clearance under ENGINE AD] USTMENTS.
ADJUSTING SCREW
LOCKNUT
CLEARANCE (COLD) 0.25 MM
ADJUSTING VALVE CLEARANCE
Engines & Generators
20