
◯: Check or Clean ◊: Replace ●: Contact your authorized Yanmar Marine dealer or distributor
System Item
Periodic Maintenance Interval
Before
Starting
See Daily
Checks on
page 28.
Initial 50
Hours
Every
50
Hours
Every
150
Hours
Every
250
Hours
or 1
Year
Every
1000
Hours or
4 Years
Whole
Visually inspecting the engine
exterior
◯
Fuel System*
Inspecting the fuel level
◯
Draining the fuel tank
◯
◯
Draining the fuel filter / water
separator
◯
Replacing the fuel filter element
◊
Inspecting the fuel injection timing ●
Inspecting the fuel injection
nozzle spray pattern
*
●
*
Lubricating
System
Inspecting the oil level
Engine
◯
Marine
Gear
◯
Changing the oil
Engine
◊
◊
Marine
Gear
◊
◊
Inspecting the function of the oil
pressure warning lamp
◯ During
Operation
Replacing the engine oil filter
element
◊
◊
Cooling
System
Inspecting the seawater outlet
◯ During
Operation
Inspecting the seawater pump
impeller
◯ ◊
Inspecting the zinc anode
◊
Air Intake and
Exhaust
System
Cleaning the intake silencer (air
filter)
◯
Cleaning the exhaust / water
mixing elbow
◯
Cleaning the breather pipe
◯
Inspecting the exhaust gas
condition
◯ During
Operation
Electrical
System
Inspecting the function of the
battery charge warning lamp
◯
Inspecting the battery electrolyte
level
◯
◯
Checking and adjusting the
alternator V-belt tension
◯
◯ ◊
Checking the wiring connectors
◯
Engine
Cylinder Head
and Block
Inspecting for fuel, oil or engine
leaks
◯ After
Starting
Tightening all major nuts and
bolts
●
Adjusting the intake / exhaust
valve clearances
◯
●
Miscellaneous
Items
Inspecting and adjusting the
throttle and shift control cables
◯
●
Adjusting the propeller shaft
alignment
◯
●
*
For EPA requirements, see Inspection and Maintenance of EPA Emission-Related Parts on page 48.
Note: These procedures are considered normal maintenance and are performed at the
owner’s expense.
PERIODIC MAINTENANCE
GM Series Operation Manual 47
© 2007 Yanmar Marine International
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