Cautions During Operation - Yanmar 6LY3-STC Operation Manual

ENGINE OPERATION
CAUTIONS DURING
OPERATION
Note: Engine trouble can arise if the engine
is operated for a long time under overloaded
conditions with the control lever in the full
throttle position (maximum engine speed
position), exceeding the continuous rated
output engine speed. Operate the engine at
about 100 rpm lower than the full throttle
engine speed.
Note: If the engine is in the first 50 hours of
operation, see New Engine Break-In on
page 9.
Always be on the lookout for problems
during engine operation.
Pay particular attention to the following:
1. Is sufficient seawater being discharged
from the exhaust and seawater outlet
pipe?
If the discharge is small, stop the engine
immediately; identify the cause and
repair.
2. Is the exhaust color normal?
The continuous emission of black
exhaust smoke indicates engine
overloading. This shortens the engine's
life and should be avoided.
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3. Are there abnormal vibrations or noise?
CAUTION! Excessive vibration may
cause damage to the engine, marine
gear, hull and onboard equipment. In
addition, it causes noticeable
passenger and crew discomfort.
Carefully select engine mounts and
propellers when you design Yanmar
Marine engine applications.
Depending on the hull structure, engine
and hull resonance may suddenly
become great at a certain engine speed
range, causing heavy vibrations. Avoid
operation in this speed range. If you hear
any abnormal sounds, stop the engine
and inspect.
4. Alarm buzzer sounds during operation
. NOTICE: If any alarm indicator with
audible alarm sound appears on the
display during engine operation, stop the
engine immediately. Determine the
cause and repair the problem before you
continue to operate the engine.
5. Is there water, oil or fuel leakage, or are
there any loose bolts?
Check the engine room periodically for
any problems.
6. Is there sufficient diesel fuel in the diesel
fuel tank?
Replenish diesel fuel before leaving the
dock to avoid running out of fuel during
operation.
6LY3 LDC Operation Manual
© 2008 Yanmar Marine International