Yanmar 6LY3 series, Operation Manual

Page: 118 / 136

PERIODIC MAINTENANCE
110
6LY3 Operation Manual
Perform the following maintenance every
1000 hours or four years of operation,
whichever comes first.
• Check the Fuel Injector Spray Pattern
• Clean and Check the Water Passages
• Replace Alternator Belt
• Adjust Intake / Exhaust Valve
Clearance
• Replace Flexible Engine Mounts
Check the Fuel Injector Spray
Pattern
Adjustment is necessary to obtain the
optimal fuel injection to ensure the best
possible engine performance.
This inspection requires specialized
knowledge and techniques. See your
authorized Yanmar marine dealer or
distributor to check the injection spray
condition.
Clean and Check the Seawater
Passages
When it is used for a long time, cleaning
the seawater passages is periodically
necessary because trash, scales, rust, and
so on collect in the seawater passages and
the cooling performance declines.
This maintenance requires specialized
knowledge. See your authorized Yanmar
marine dealer or distributor to clean and
check the water passages.
Replace Alternator Belt
Replace the alternator belt with a new one
every 1000 hours or four years, whichever
comes first, even if there is no crack or
damage in the surface.
See Adjust Alternator V-Belt Tension on
page 103
.
Adjust Intake / Exhaust Valve
Clearance
Proper adjustment is necessary to
maintain the correct timing for opening and
closing the valves. Improper adjustment
will cause the engine to run noisily,
resulting in poor engine performance and
engine damage. See your authorized
Yanmar marine dealer or distributor to
adjust the intake / exhaust valve clearance.
Replace Flexible Engine
Mounts
Be sure to replace the Yanmar flexible
engine mounts every 1000 hours or 4
years, whichever comes first.
The rubber tension of the flexible engine
mounts is lost after many hours of use.
This leads to a drop in vibration absorption
performance, and also causes centering
misalignment of the propeller shaft.
Every 1000 Hours of Operation
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