Installation manual

ENGINE ADJUSTMENTS
NOTE: WESTERBEKE recommends that the following engine adjust-
ments be pe/formed by a competent engine mechanic. The information
below is provided to assist the mechanic.
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 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 chart.
OIL GALLERY
MECHANICAL
OIL PRESSURE GAUGE
DlL GALLEIiY
ENGINE COMPRESSION
Check tile 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 tl10 starter
motor until the pressure reaches a maximum value. Repeat
this process for each cylinder. Look for cylinders with
dramaticaliy (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/cm'). at 280 rpm.
If
a weak cylinder is flaaked 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.
Abnonnally high readings :on all cylinders indicates heavy
carbon accumulations, Ii condition that might be
accompanied
by high pressures and noise.
COMPRESSION TESTER
ADAPTER", . .f- .'
TESTING ENGINE· "" . i""",,'".
COMPRESSION ""'~~INJECTOR DR
'.. ~ . GLOW PLUG HOLE
. COMPRESSION PRESSURE AT 250 RPM
626 psi - 44 Kgf!crtf -4.32 Mpa
ALLOWABLE LIMIT AT 250 RPM
472 psi -33.2 Kgf!crtf -3.26 Mpa
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,
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 (IOmm) and no more than 112
inch (12mm) as the belt is depressed with the thumb at the
mfdpoint 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 altemator 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.
Englne_s &.Generators
ADJUSTING
BOLT
26