Installation manual
ENGINE
ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine adjust-
ments
be
peiformed
by a competent engine mechanic. The information
below is provided to assist the mechanic.
ENGINE
COMPRESSION
PLUG
Check the compression pressure.
To
do
this wann the engine,
. remove all fuel injectors, or glow plugs, disconnect the
fuel
"~Shut_Off
solenoid wire, and install a compression adapter
in
'''-.,. the injector hole or glow plug hole. Connect a compression
"-.,.
tester on the adapter and crank the engine with
the
starter
'Jif:ffI'~~
motor until the pressure reaches a maximum value. Repeat
this process for each cylinder. Look for cylinders with
Idnumltic,ally
(at least 20%) lower compression than
the
,m'enlge of the others. Compression pressure should not differ
OIL
PRESSURE
GAUGE
TESTING
OIL
PRESSURE
To
tesJ
the oil pressure,_l'effiove the oil pressure sender, then
install a mechanical oil pressure gauge in it's place. After
wanning
up
.the
engine, set the engine speed at idle and read
the
oil pressure gauge.
OIL
PRESSURE
WILL
RANGE
BETWEEN
50
AND
55PSI
AT
1800
RPM
LOW
OIL
PRESSURE
The specific safe minimum oil pressure
is
5 -
10
psi. A grad-
ualloss
of
oil pressure usually indicates worn bearings. For
additional information on low oil pressure readings, see
the
ENGINE
TROUBLESHOOTING
charlo
VALVE
ADJUSTMENT
Remoye the glow plugs from the cylinder so the engine can
be easily
manu3Uy
rotated. Remove the valve train rocker
cover. Rotate
the
engine crank manually and observe the
valve operatidnfor cylinder #1 and bring the #1 piston
up
to
Top
Dead
Center
of
the compression stroke. Adjust
the
valves
referencing the charl
below.
Rotate
the
crankshaft 360'. This
should put the valves for cylinder #1 in
the
overlap position.
Adjust the remaining valves following
the
ch;ut
below.
VALVE
CLEARANCE
(ENGINE
COLD)
0.23
-
0.27mm
(0.0091
•
0.0106
in)
IN
EX
IN
EX
IN
EX
When
No.1
1st
0 0
0 0 0
0
piston
is
2nd
0
0
0
compressed
3rd
0
0
Top
Dead
Center
4th
When
No.1
1st
piston
is
in
2nd
0
0
0
overlap
3rd
0
0
position
4th
0
0
.'::~~~
I
VALVE
CLEARANCE
it:
--'L
(ENGINE
COLD)
~
0.23
-
0.27mm
i!iIl
I·
(0.0091
-
0.0106
in)
by
more than 35.5 psi (2.5 kg/cm') at 280 rpm.
If
a weak cylinder is flanked by healthy cylinder, the problem
is either valve or piston related. Check the valve clearances
for the weak cylinder, adjust
as
needed and test again.
If
the
cylinder
is
still
low,
apply a small amount
of
oil into the
cylinder
to
seal the rings
and
repeat the test.
If
compression
comes
up
-
the
rings are
faulty.
Abnormally high readings on all cylinders indicates heavy
carbon accumulations, a condition that might be
accompanied by high pressures and noise.
NOTE:
In case
of
severe vibrations
and
detonation noise, the
cause
may
be
fuel
injector problems, see FUEL
INJECTORS. Poor
fuel
quality, contaminates
and
loss
of
positive
fuel
pressure to the injection
pump
will result in
injector faults.
When re-installing the glow plugs use anti-seize compound.
COMPRESSION
TESTER
ADAPTER", "
~
",:>;
..
,+~;./:.
~~~INJECTOROR
~
GLOW
PLUG
HOLE
TESTING
ENGINE
COMPRESSION
,.yo
WESTERBEKE
Engines & Generators
28