ENGINE
ADJUSTMENTS
NOTE:
WESTERBEKE
reco~nds
that
the
following
engine
adjustments
be
peiformed
by
a competent engine
mechanic.
The
information
below is provided to
assist_
the
mechani9
-
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
Z.
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.
l
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
stroke
•
•
EX
When
No.
1
piston
is
positioned
at
top
of
exhaust
stroke
IN
•
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
100.
Locate the timing
mark on the crankshaft pulley and mark it with white
chalk or crayon.
2. Start the engine 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
rotati.Iig
the distributor
body.
Use the following timing
specifications.
Timing
Specifications:
10"
±
5°BTDCat1800
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
shQwn.
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
lw/WESTERBEKE
)_Engines
&
Generators
3.0
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