Testing Engine Operation - Yanmar 6LY3 series Service Manual

Periodic Maintenance Procedures
12/05

Testing Engine Operation

Perform a test run of the engine after performing
maintenance:
Preliminary Precautions
Before performing a test run, check the following:
1. Remove any water from the fuel filter, water
separator and fuel tank.
2. Fill the diesel fuel, oil and coolant.
3. Only use oil recommended by Yanmar.
4. Be sure to mix LLC with fresh water.
5. Provide good ventilation in the engine room.
6. Allow the engine to warm up before making any
adjustments.
6LY3 Service Manual
Engine Test Run
1. Start the engine and idle at 700 to 900 rpm for
about 5 minutes.
2. Check for any water, diesel fuel or oil leakage.
Check for any abnormal vibrations or noises.
Check the oil pressure, coolant temperature
and exhaust gas color.
3. Adjust the no-load minimum and maximum
speeds. (See Adjusting the No-load Minimum
Speed on page 4-26.)
4. Perform loaded operations as required.
5. Shut the engine down after test running and let
stand for about 10 minutes. NOTICE: Check the
oil and coolant levels again and add as
required.
© 2007 Yanmar Marine International
PERIODIC MAINTENANCE
4-31