Yanmar 4BY2 - Page 49

○: 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
Whole
Visual
inspection of en-
gine
exterior
○
Before
starting
Fuel Sys-
tem
Check for fuel
leakage
○
Before
starting
Check the fuel
level and refill if
necessary
○
Before
starting
Drain water and
sediment from
fuel tank
○
Drain the fuel
filter / water sep-
arator If
necessary
○
Replace the fuel
fine filter
◊
Replace fuel
filter / water
separator ele-
ment
◊
Check the fuel
pump and fuel
lines
●
Lubricating
System
Check the en-
gine oil level and
refill if necessary
○
Before
starting
Change the en-
gine oil and re-
place the oil filter
element
◊
Initial 50
◊
Cooling
System -
Engine
Coolant
Visual inspec-
tion of cooling
system
○
Before
starting
Check coolant
level and check
for leaks
○
Before
starting
Replace coolant When Long Life Coolant (LLC) is used, replace every two years.
PERIODIC MAINTENANCE
BY Series Operation Manual 43
© 2008 Yanmar Marine International