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Westerbeke 55A FOUR Manual de instalación Pagina 31

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ENGINE
ADJUSTMENTS
(Continued)
COMPRESSION
TEST
1.
Warm the engine up to operating temperature.
2.
Stop the engine.
3. Remove all four glow plugs.
4. Disconnect the DC power connection
to
the fuel
shutoff solenoid on the injection pump.
5. Install the compression tester glow plug adapter in
the
glo\y plug opening
of
#1
cylinder. Connect the
compression gauge to the glow plug adapter.
6. Crank the engine with the starter and allow the gauge
to reach its maximum reading.
7. Record the reading and proceed to the next cylinder.
8. Compare readings
to
the table below. Take corrective
action
as
needed.
Compression
pressure
kg/cm
2
(lb/in2)-rpm
Standard
30
(426)
-
200
Limit
27
(384)
-
200
NOTE:
Whenpeiforming the compression test, shut
off
the
raw water supply
to
the engine mounted raw water pump.
This
is
to
prevent filling
of
the exhaust system with raw
water while
peiforming the test.
FUEL
INJECTION
NOZZLE
TEST
When the injection starting pressure is too high or too
low or the fuel spray pattern is improper, an abnormal
fuel combustion takes place in the engine leading to
lowered power output, blackish exhaust smoke and un-
wanted combustion noise. Further, it can cause a piston
seizure or piston damage if not corrected. In such cases,
the injection nozzle test should be performed and the
faulty nozzle(s) replaced
as
required.
Use an injection nozzle tester to check the static injection
starting pressure and condition
of
the spray pattern every
800 operating hours.
Injection nozzle pressure is
1920 psi +
71
psi
(135 kg/cm2
+ 5 kg/cm2.
A
WARNING:
When
testing a
nozzle
beware
that
high
pressure
might blow
off
the
light oil
and
cause
injury.
Keep
away
from
the
nozzle
end!
GOOO
POOR
l-vvl
WESTERBEKE
I
Engines
&
Generators
26
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