Yanmar 6LY3 series Operation Manual page 76

ENGINE OPERATION
CAUTION
New Engine Break In:
• On the initial engine start-up,
check for proper engine oil
pressure, diesel fuel leaks,
engine oil leaks, coolant leaks,
and for proper operation of the
indicators and / or gauges.
• During the first 50 hours of
operation operate your new
engine under a substantial
load at all times. For best
break-in results operate the
engine at various speeds.
• Operating the engine in
NEUTRAL must be avoided.
During the first 50 hours, avoid
operation below 2000 rpm.
• During the break-in period,
carefully observe the engine
oil pressure and engine
temperature.
• During the break-in period,
check the engine oil and
coolant levels frequently.
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.
Always be on the lookout for problems
during engine operation.
Pay particular attention to the following:
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1. Is sufficient seawater being discharged
2. Is the exhaust color normal?
3. Are there abnormal vibrations or noise?
0000011enMarine
from the exhaust and seawater outlet
pipe?
If the discharge is small, stop the engine
immediately; identify the cause and
repair.
The continuous emission of black
exhaust smoke indicates engine
overloading. This shortens the engine's
life and should be avoided.
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.
6LY3 Operation Manual
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