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Westerbeke 20B TWO Manual de instalación Pagina 48

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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.
ENGINE
COMPRESSION
Check the engine's compression pressure at 500 and 1250
operating hours or whenever engine performance is reduced.
Remove each glow plug and check each cylinder's
compression pressure. The engine's cranking speed is
at
280 rpm.
MEASURING
COMPRESSION·.
CheckJ.le compression pressure.
To
do this warm 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
motor until the pressure reaches
a maximum value. Repeat
this process for each cylinder. Look for cylinders with
dra-
matically (at least 20%) lower compression than the average
of
the others. Compression pressure should not differ by
more than 35.5 psi (2.5 kg/em') 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
INJEC-
TORS. 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
VALUES
STANDARD
(AT
280
RPM)
398.16
PSI
(28Kg/cm')
MINIMUM
(AT
280
RPM)
355.5
PSI
(25Kg/cm'l
MAXIMUM
ACCEPTABLE
DIFFERENCE
BETWEEN
35.5
PSI
(2.5
Kg/cm'l
40
DRIVE
BELT
ADJUSTMENT
Excessive drive belt tension can cause rapid wear
of
the belt
and reduce the service life
of
the fresh water pump's bearing.
A slack belt
or
the presence
of
oil on the belt can cause belt
slipping, resulting in high operating temperatures.
The drive belt
is
properly adjusted
if
the belt can be
deflected no less than
3/8
inch (lOmm) and no more than
112
inch (12mm) as the belt is depressed with the thumb at the
midpoint between the two pulleys on the longest span
of
the
belt.
A spare belt or belts should always
be
carried on board.
A
WARNING:
Never
attempt
to
check
or
adjust
the
drive
belt's
tension
while
the
engine
is
in
operation.
Adjusting
Belt
Tension
1.
Loosen the alternator pivot bolt.
2.
Loosen the alternator adjusting bolt.
3. With the alternator loose, swing it outward until
the
drive
belt is tensioned correctly.
4.
Tighten both bolts.
5.
Check the tension again after the engine has been in
operation.
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