Westerbeke 65B-FOUR Manual de instalación Pagina 31

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ENGINE
ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine adjust-
ments be
performed
by
a competent engine mechanic. The information
below is provided to assist the mechanic.
CHECKING
VALVE
CLEARANCE
Valve
clearance must be checked and adjusted when engine
is cold.
1. Remove the head cover.
2. Align the
lTC
mark line
on
the flywheel and projection
on
the housing so that the No.1 piston comes to the
compression
or
overlap top dead center.
3. Check the following valve clearance
(1) marked with
~
using a feeler gauge.
4.
If
the clearance is not within the factory specification,
adjust with the adjusting screw.
VALVE
CLEARANCE
0.23
0.27mm
(0.0091
0.0106in)
The TC marking line
on
the flywheel is
just
for the No. 1
There is no
TC marking for the other cylinders. The No.1
piston comes to the top dead center position when the
TC
marking is aligned with the projection in the window on
the flywheel-housing.
Tum
the flywheel 0.26 radius {15°)
clockwise and counterclockwise to see
if
the piston is at
the compression top dead center
or
the overlap position.
Now, referring to the table below, readjust the valve
clearance.
The
piston is at the top dead center when both
the IN. and EX. valves do not move.
It
is at the overlap
position when both the valves move.
Finally, turn the flywheel 6.28 radius
(360°) and align the
TC marking and the projection perfectly. Adjust all the other
valve clearances as required.
After turning the flywheel counterclockwise twice or three
times, recheck the valve clearance.
After adjusting the valve clearance, firmly tighten the locknut
of
the adjusting screw.
Adjustable
Valve
a·rrangement
cylinder
4
CYL.
location
of
piston
IN.
EX.
No.1
* *
When
No.
1 piston
is
No.2
*
compression
top
dead
center
No.3
*
. '
No.4
No.1
When
No.
1 piston is
No.2
*
overlap position
No.3
*
No.4
*
*
TIMING
WINDOW
·
-=-
(located
on
the
engine
bell
housing)
Engines & Generators
25
ADJUSTING
SCREW
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