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.
TESTING
ENGINE
COMPRESSION
Make certain the oil level (dipstick)
is
at the correct level
and the air intake filter
is
clean. The battery and starter motor
must also be
in
good condition.
1.
Warm the engine to normal operating teITiperature.
2.
Move the control lever to a position for shutting off the
fuel. (Disconnect the wires
if
a fuel shutdown solenoid
is
used).
3.
Remove all the glow plugs from the engine and install
the compression gauge/adapter combination to the
cylinder on which the compression
is
to be measured.
MEASURING
COMPRESSION
DIAL
GAUGE
4.
Close the raw water seacock (thru-hull).
5.
Crank the engine and allow the gauge to reach a
maximum reading, then record that reading.
6.
Repeat this process for each cylinder.
COMPRESSION
PRESSURE
441
psi
(31.0
Kg/em')
at
200
rpm.
ALLOWABLE
LIMIT
370psi
(26.0
Kg/em').
MAXIMUM
PERMISSIBLE
DIFFERENCE
BETWEEN
CYLINDERS
28.44
psi
(2.0
Kg/em')
NOTE:
Jfthe readings
are
below
the
limit,
the
engine
needs
an
overhaul.
7.
Re-install the glow plugs and reset the fuel shut-off
to
the
run position.
S.
Open the
raw
water
seacock (thru-hull).
Low
Compression
When low compression
is
found, determine the cause
by
applying a small amount
of
oil
in
the cylinder thru the glow
plug hole. Allow the oil to settle.
Install the pressure gauge and repeat the above test. If the
compression reading rises dramatically, the fault is with the
rings. If the compression valve does not rise, the problem
is
with the valves.
A slight rise
in
compression would indicate a problem with
both the rings and the valves.
OIL
PRESSURE
The engine's oil pressure, during operation,
is
indicated
by
the oil pressure gauge on the instrument panel. During
normal operation, the oil pressure will range between
40 and
85
psi.
NOTE:
A newly started, cold engine can
have
an
oil
pressure
reading
up
to
85
psi.
A warmed engine can have
an
oil
pressure
reading
as
low
as 40 psi.
These
readings
will
vary
depending upon
the
temperature
of
the
engine,
the
load
placed
on
the
engine,
and the RPM's.
Low
Oil
Pressure
The specified safe minimum oil pressure
is
5 -
10
psi. A
gradual loss
of
oil pressure usually indicates worn bearings.
For additional information on low oil pressure readings, see
the ENGINE
TROUBLESHOOTING
chart.
Testing
Oil
Pressure
To
test the oil pressure, remove the oil pressure sender, then
install a mechanical oil pressure gauge in it's place. After
warming up the engine, set the engine speed at idle and read
the oil pressure gauge.
OIL
PRESSURE
15
-
20
psi
at
idle
speed.
SENDER
AND
SWITCH
TORQUE
9 -
13
n-Ib
(1.2
-
1.8
m -
Kg).
PREHEAT
SOLENOID
OIL
PRESSURE
SWITCH
20A
BREAKER
Engines & Generators
33