Every 500 Hours Of Operation; Every 1000 Hours Of Operation - Yanmar 6LY3-STC Operation Manual

PERIODIC MAINTENANCE

Every 500 Hours of Operation

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 Exhaust / Water Mixing
Elbow
• Adjust the No-Load Minimum Speed
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 of 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
56.
Replace the Exhaust / Water Mixing
Elbow
The exhaust / water mixing elbow must be
replaced at 500 hours or 2 years, even if no
damage is found. See your authorized
Yanmar Marine dealer or distributor.
Adjust the No-Load Minimum Speed
This maintenance requires specialized
knowledge and techniques. See your
authorized Yanmar Marine dealer or
distributor to adjust the no-load minimum
speed.
60

Every 1000 Hours of Operation

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
other deposits or debris 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.
6LY3 LDC Operation Manual
© 2008 Yanmar Marine International