Yanmar 4BY2 - Page 50

○: Check or Clean ◊: Replace ●: Contact your authorized Yanmar marine dealer or distributor
System Item Periodic Maintenance Interval
Daily
See Daily
Checks
on page
46
Every
50
hours or
monthly
which-
ever
comes
first
Every
250
hours
or one
year
which-
ever
comes
first
Every
500
hours
or 2
years
which-
ever
comes
first
Every
1000
hours
or 4
years
which-
ever
comes
first
Every
2000
hours
or 8
years
which-
ever
comes
first
Cooling
System -
Seawater
Circuit
Visual
inspection of
cooling system
○
Before
starting
Check the
seawater outlet
○
Before
starting
Check seawater
pump belt for
wear, replace if
necessary
◊
Check seawater
filter (if
equipped) and
inlet
○
Replace the
anodes*
◊
Check or
replace the sea-
water pump
impeller
● ●
Air Intake
and
Exhaust
System
Visual inspec-
tion
○
Before
starting
Replace turbo-
charger heat
shield
◊
Check the
exhaust pipe
○
Check the air
intake system
○
Check the
exhaust / water
mixing elbow
●
Replace the air
filter element
●
PERIODIC MAINTENANCE
44 BY Series Operation Manual
© 2008 Yanmar Marine International