Specifications

PERIODIC MAINTENANCE
56 YM Series Operation Manual
: Check or Clean : Replace ●: Contact your authorized Yanmar Marine dealer or distributor
System Item
Periodic Maintenance Interval
Before
Starting
See
Daily
Checks
on
page 59
.
Initial
50
Hours
Every
50
hours
or
monthly
which-
ever
comes
first
Every
100
hours
or six
months
which-
ever
comes
first
Every
150
hours
or one
year
which-
ever
comes
first
Every
250
hours
or one
year
which-
ever
comes
first
Every
1000
hours
or 4
years
which-
ever
comes
first
Whole Visual inspection of
engine exterior

Fuel
System
Check the fuel level and
refill if necessary

Drain water and sediment
from the fuel tank

Drain the fuel / water
separator

Replace the fuel filter
element

Check the fuel injection
timing
●
Check the fuel injector
spray pattern*
●*
Lubricatin
g System
Check the
engine oil
level
Engine

Marine
Gear

Replace the
engine oil
Engine 
Marine
Gear

Sail Drive 
Replace the
oil filter
element
Engine

Cooling
System
Seawater outlet 
During
Operatio
n
Check coolant level

Check or replace the
seawater pump impeller

Replace coolant Every year. When Long Life Coolant (LLC) is used, replace every two
years. See Engine Coolant Specifications on page 34.
Clean and check the
seawater passages
●
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