Installation manual
ENGINE
ADJUSTMENTS
NOTE:
WESTERBEKE
recommends
that
the
following
engine
adjust·
ments
be
peifonned by a competent
engine
mechanic.
The
infonnation
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
ITC
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, tum 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, finnly tighten the locknut
of
the adjusting screw.
Adjustable
Valve, arrangement
I-
cylinder
4CYL.
location
01
piston
IN.
EX;
No.1
"*
"*
When No.1 pistop is
No.2
"*
compression top dead
center
No.3
*
, ,
No.4
No.1
When
No.1 piston is
No.2
"*
overlap position
No.3
"*
PROJECTION
1
ITG
MARK
ADJUSTING
SCREWS,
LOCKNUT
o
TIMING
WINDOW
\ \
FLYWHEEL
\1
/
.
FLYWHEEL
jHOUSING
No.4
"*
"*
r-:"'''''''''''~IIiI~
VALVE
CLEARANCE
'0
U'
0.23·
0.27mm
(0.0091
·0.010610)
~'a,
Engines & Generators
25