Cautions During Operation - Yanmar 6LT Series Operation Manual

CAUTIONS DURING
OPERATION
• 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. While
cruising, operate the engine at about 90% power
level - 2400 RPM.
• 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.
3. Are there abnormal vibrations or noise?
Excessive vibration may cause damage to the
engine, marine gear, hull and onboard
equipment. In addition, it causes noticeable
passenger and crew discomfort.
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.
6LT Series Operation Manual
4. Alarm buzzer sounds during operation.
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.
7. Never turn off the battery switch (if equipped) or
short the battery cables during operation.
Damage to the electric system will result.
ENGINE OPERATION
35