Yanmar 6LY3 series Service Manual page 64

PERIODIC MAINTENANCE
Check Points and Precautions During Running
Step Item
Checks Before
1
Operation
No-load
Operation;
2
Warm-up
Operation
Cruising (Load)
3
Operation
Stopping the
4
Engine
Checks After
5 Stopping the
Engine
4-32
Instructions
Make sure the seacock is open.
Make sure there is enough oil and
coolant.
Operate the electronic control head and check if it
works properly.
Check the oil pressure and coolant temperature on
the display.
When the engine starts, check the following:
• There is no leakage of coolant, diesel fuel or oil.
• Exhaust gas does not leak.
• There is no abnormal indication on the display.
• There is no abnormality in the seawater
discharge, engine vibration or engine sound.
To warm up the engine, operate at low speed for
about 5 min., raise the speed to the no-load rated
speed and then to maximum speed.
Do not operate the engine at full load yet, but raise
the speed gradually for about 10 min. until it
reaches the rated speed.
Make sure that the exhaust gas color and
temperature are normal.
Check the instrument panel and see if the coolant
temperature and oil pressure are normal.
Before stopping the engine, operate it at
650 to 700 rpm for about 5 min.
Raise engine speed to 1,800 rpm just before
stopping the engine and idle the engine for about
3 to 4 seconds.
Check for coolant and oil leaks.
Make sure no nuts and bolts are loose.
Close the seacock and fuel cocks.
When the temperature is expected to fall below
freezing, drain the seawater.
Turn off the battery switch.
© 2007 Yanmar Marine International
Periodic Maintenance Procedures
Precautions
Alarm indicator does not
appear on the display.
Fix leaks if any.
Check the
intake / exhaust valves, fuel
injection nozzle and cylinder
head.
Do not raise the engine
speed abruptly.
Stopping the engine
suddenly during high-speed
operation increases the
temperature of engine parts.
This procedure prevents
carbon from being deposited
on the valve seats.
Check the oil seal area.
Check the engine installation
bolts.
Drain the seawater pump.
6LY3 Service Manual