PERIODIC MAINTENANCE
6LY3 Operation Manual 109
Replace Engine Coolant
Cooling performance drops when coolant
is contaminated with rust and scale. The
coolant must be replaced periodically
because its properties deteriorate over
time.
To drain the engine coolant, open the fresh
water drain cocks (two places).
See Engine Coolant on page 46 for
coolant specifications.
• NEVER mix different types and / or
colors of coolants.
Discard old coolant in an approved manner
according to environmental laws.
Perform the following maintenance every
500 hours or two years of operation,
whichever comes first.
• Replace Seawater Pump Impeller
• Adjust the Propeller Shaft Alignment
• Check Alternator Belt Tension
Replace the Seawater Pump
Impeller
Replace the used seawater pump impeller
periodically. See your authorized Yanmar
marine dealer or distributor.
Adjust the Propeller Shaft
Alignment
The rubber tension of the flexible engine
mounts is lost after many hours' use. This
leads to a drop in vibration absorption
performance, and also causes centering
misalignment of the propeller shaft.
This maintenance requires specialized
knowledge and techniques. See your
authorized Yanmar marine dealer or
distributor to adjust the propeller shaft
alignment.
Check Alternator Belt Tension
Check the alternator belt tension. See
Adjust Alternator V-Belt Tension on
page 103.
Every 500 Hours of Operation
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