Installation manual
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.
VALVE
CLEARANCE
ADJUSTMENT
The valve clearance must
be
adjusted every 200 operating
hours. or whenever the valve rocker
is
abnormally noisy.
Valve adjustment should only be done when engine
is
cold.
Cold engine valve clearance
is
0.0157
in
(0.40 mm).
~..J
~D.D1571N
'D.4DMMI
~VE
~
~~EARANCE
NOTE:
The head bolts have been tightened with the
"Angular Tightening Method". Therefore, it
is
not necessary
to
retighten the cylinder head bolts before adjusting the valve
clearances.
3. After adjusting the valves with piston No. I at
IDC,
rotate the crankshaft 360
0
again aligning the TDC mark
and the pulley mark. This brings piston
No.6
or
No.4
to
TDC, then adjust the remaining valves.
INJECTION
TIMING
CHECK/ADJUSTMENT
Improper injection timing can cause engine failure. In normal
servicing, this check and adjustment
in
unnecessary, however,
it
might be necessary in conjunction with other related work
such as
an
engine overhaul.
TIMING
MARKS
.........
'~::7'l'---TDC
MARK
PULLEY
MARK
ADJUSTMENT
PROCEDURE
CRANKSHAFT
PUllEY
Chart
shows
six
cylinder
model
Cylinder
No.
1
2
3
4
5
6
Valve
arrangement
I
E I E I E I E I E
I
E
When
No.1
cylinder
is
at
TOC
in
the
com-
O 0
0
0 0 0
pression
stroke
When
No.6
cylinder
is
at
TOC
in
the
com-
@ @ @ @ @ @
pression
stroke
1.
In
order to bring No. I or
No.6
piston (six cyl.)
No.4
piston (four cyl.)
to
the top dead center
in
the compression
stroke, align the TDC mark and the crank shaft pulley
mark.
2.
Do the adjustment on the circle marked valves
in
the
above table where No. I piston
is
in the
IDC
in
the
compression stroke. After these steps, do the adjustment
on the double circle marked valves where the
No.6
piston
(six cyl.)
No.4
piston (four cyl.)is on
IDC
in the
compression stroke.
Chart
shows
four
cylinder
model
I-
Z
=
a::
II.
Cylinder
No.
Valve
arrangement
When
No.1
cylinder
is
at
TDC
in
the
com-
pression
stroke
When
No.4
cylinder
is
at
TOC
in
the
com-
pression
stroke
1
I E
O 0
2 3
4
I
E
I E I
E
0 0
@ @
@
@
CHECK
PROCEDURE
Bring No. 1 piston to the top dead center on the compression
stroke. Turn the crankshaft pulley
c1ockwi~e
(viewed at
engine front) and align the mark on the crankshaft pulley
with the
IDC
mark.
Remove the access cover at the front
of
the injection pump
and check the alignment between the pointer
A on the
injection pump gear lock plate and the projected pointer
B on
the timing gear case.
If
A and B are
in
alignment, the timing
is
set correctly.
If they are
in
alignment, No. 1 cylinder
is
at the TDC on
the compression stroke.
If
it
is
in
misalignment, recheck by
turning the crankshaft pulley one more tum to repeat the
procedure to make sure that it
is
in
alignment.
INJECTION
PUMP
MARKS
Engines & Generators
34