Yanmar 4JH45 Specifications download pdf (Page 57)

ENGINE OPERATION

JH Series Operation Manual 51

12/05

CAUTIONS DURING

OPERATION

NOTICE

Engine trouble can arise if the engine is

operated for a long time under overloaded

conditions with the control handle in the full

throttle position (maximum engine speed

position), exceeding the continuous rated

output engine speed. Operate the engine

at about 100 min

-1

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 12 .

Always be on the lookout for problems

during engine operation.

Pay particular attention to the following:

• 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.

• Is the smoke color normal?

The continuous emission of black

exhaust smoke indicates engine

overloading. This shortens the engines

life and should be avoided.

• Are there abnormal vibrations or noise?

NOTICE

Excessive vibration may cause damage

to the engine, marine gear, hull and

onboard equipment. In addition, it

causes able 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.

• 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.

• Is there water, oil or fuel leakage, or are

there any loose bolts?

Check the engine room periodically for

any problems.

• 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.

• When operating the engine at low speed

for long periods of time, race the engine

once every 2 hours.

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