Yanmar 6SY Series, Operation Manual

Page: 111 / 128

PERIODIC MAINTENANCE
6SY Operation Manual
103
1. If possible, run the engine until it has
reached operating temperature and
then drain the coolant system.
See
Drain, Flush, and Refill the Engine
Coolant on page 97.
2. Remove the thermostats.
3. Fill the system (including the heat
exchanger, if equipped) with clean, hot
water mixed with liquid dishwasher
detergent designed for household use
or a product intended to clean
automotive cooling systems, and
approved for use with aluminum
components.
Concentration: 1% (0.1 / 10 L)
(0.1 / 10 qt).
4. Run the engine until warm (about
20 - 30 minutes).
5. Drain the coolant system. See Drain,
Flush, and Refill the Engine Coolant on
page 97.
6. Fill the system again using clean, hot
water and run the engine for about
20 - 30 minutes.
7. Drain the water from the system.
8. Reinstall the thermostats.
9. Fill the system with new coolant. See
Engine Coolant on page 40 for refilling
coolant.
10.IRefill the system with hot water and
run the engine for about 20 - 30
minutes.
11.Drain the water from the system.
12.Reinstall the thermostats.
13.Fill the system with new coolant. See
Check Diesel Fuel, Engine Oil, and
Engine Coolant Levels on page 45
for
refilling coolant.
CAUTION
• ALWAYS be environmentally
responsible.
• Follow the guidelines of the
EPA or other governmental
agencies for the proper
disposal of hazardous
materials such as engine oil,
diesel fuel and engine coolant.
Consult the local authorities or
reclamation facility.
• NEVER dispose of hazardous
materials irresponsibly by
dumping them into a sewer, on
the ground or into ground
water or waterways.
• Failure to follow these
procedures may seriously
harm the environment.
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