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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.
FUEL SHUT-OFF
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-
ual loss of oil pressure usually indicates worn bearings. For
additional infonnation on low oil pressure readings, see the
ENGINE TROUBLESHOqTING chart.
OIL GALLERY
MECHANICAL
OIL PRESSURE GAUGE
OIL GALLERY
ENGINE COMPRESSION
Check the compression pressure. To do tllis 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
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
2 )
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.
Abnonnally high readings on all cylinders indicates heavy
carbon accumulations, a condition that nlight be
accompanied by lligh pressures and noise.
1. Loosen the locknut on the
idle adjustment bolt.
2. Adjust the bolt so that the
throttle control lever will hold
the engine at a quiet idle
( 800
to
1000 RPM).
3. Tighten the locknut.
. 4. Race the engine several
times to ensure the idle
DRIVE BELT ADJUSTMENT
Ia
STOP CONTROL
CAiRE
ENGINE STOP ADJUSTMENT
POSITION CABLE SO THAT THE
STOP CONTROL WILL SHUT THE
ENGINE DOWN.
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 l/2
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.
Engines & Generators
ALTERNATOR
ADJUSTING
BOLT
26
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Troubleshooting
