
PERIODIC MAINTENANCE
PROCEDURES
After Initial 50 Hours of
Operation
Perform the following maintenance after the
initial 50 hours of operation.
• Draining the Fuel Tank
• Draining the Fuel Filter / Water
Separator
• Changing the Engine Oil
• Replacing the Engine Oil Filter
Element
• Changing the Marine Gear Oil
• Checking and Adjusting the
Alternator V-Belt Tension
• Inspecting and Adjusting the
Intake / Exhaust Valve Clearances
• Inspecting and Adjusting the Throttle
and Shift Control Cables
• Adjusting the Propeller Shaft
Alignment
Draining the Fuel Tank
WARNING! When you are draining the
fuel tank to perform maintenance, 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 you remove
any fuel system component.
1. Put a pan under the drain cock
(Figure 1, (2)) to catch the fuel.
0004542
(3)
(1)
(2)
Figure 1
1 – Sediment Bowl
2 – Drain Cock
3 – Fuel Line to Engine
Note: Optional fuel tank shown.
Actual equipment may differ.
2. Open the drain cock and drain water
and sediment. Close the drain cock
when the fuel is clean and free of water.
Draining the 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.
1. Close the fuel cock.
2. Put a pan under the fuel / water
separator.
3. Remove the fuel filter cover and drain
any water and dirt collected inside.
4. Reassemble the fuel filter.
PERIODIC MAINTENANCE
GM Series Operation Manual 49
© 2007 Yanmar Marine International
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