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ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends
that the
following engine
adjustments be performed
by
a competent engine mechanic.
The
z"nfoniiation 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 stfOke
• •
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 lb-ft (0.4 • 0.7 kg·m)
VALVE CLEARANCE
HOT: IN 0.25mm (0.0098 In)
EX 0.30mm (0.0118 in)
IGNmON TIMING
1. Attach a timing light to the
#1
spark plug and mark the
front timing pointer to indicate 10". Locate the timing
mark on the crankshaft pulley and mark
it with white
chalk or crayon.
2. Start the engllie and warm it up to its nonnal 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
first
timing pointer.
Do
this by loosening and slowly rotatiiig
the distributor body. Use the following timing
specifications.
Timing SpecHicallons: 111°
:1:
5° BTDC at 1800 rpm
(no load on generator)
IGNITION TIMING
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
36.2 - 43.4 lb-ft {5.0 - 6.0 Kg-m). Then proceed to
the next head bolt in the sequence. Tighten
the
RS (rocker
cover stud) securely.
6
4
2
,7
FRONT OF..,....,__,
ENGINE ......,._....
5
30
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