Every 50 Hours Of Operation - Yanmar 6LY3-STC Operation Manual

Check the Electronic Control
System Operation
The electric governor on the engine and the
marine gear are connected to the control
head, rocker switch panel and display
through electric devices such as the Engine
Interface Module.
Adjust the Propeller Shaft Alignment
The flexible engine mounts are compressed
a little in the initial engine operation, which
may cause centering misalignment between
the engine and the propeller shaft.
Check for any unusual noise and vibration in
the engine / boat hull, while increasing and
decreasing the engine speed gradually.
If there is unusual noise and / or vibration,
this maintenance requires specialized
knowledge and techniques. See your
authorized Yanmar Marine dealer or
distributor to adjust the propeller shaft
alignment.
6LY3 LDC Operation Manual

Every 50 Hours of Operation

Perform the following maintenance every 50
hours or one month of operation, whichever
comes first.
• Drain Fuel Filter and Fuel Filter / Water
Separator
• Check Battery Electrolyte Level
• Adjust Alternator V-Belt Tension or
Replace Alternator Belt
Drain Fuel Filter and Fuel Filter /
Water Separator
WARNING! When removing any fuel
system component to perform
maintenance (such as changing the fuel
filter), put an approved container under
the opening to catch the fuel. NEVER
use a shop rag to catch the fuel. Vapors
from the rag are flammable and
explosive. Wipe up any spills
immediately. Wear eye protection. The
fuel system is under pressure and fuel
could spray out when removing any fuel
system component.
CAUTION! If the fuel filter / water
separator is positioned higher than the
fuel level in the fuel tank, water may not
drip out when the fuel filter / water
separator drain cock is opened. If this
happens, turn the air vent screw on the
top of the fuel filter / water separator 2–
3 turns counterclockwise. Be sure to
tighten the air vent screw after the water
has drained out.
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
53