Yanmar 4BY2 - Page 51

○: 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
Electrical
System
Check the
electrolyte level
in the battery
(serviceable bat-
teries only)
●
Check the wiring
connectors
○
Before
starting
Check alternator
belt for wear,
replace if
necessary
○ ●
Miscellane-
ous Items
Check the alarm
and indicators (if
equipped)
○
Check or
change power
steering fluid
● ●
Check for water
or oil leakage
○
Before
starting
Check shift
cable adjust-
ment
●
Initial 50
●
Adjust the
propeller shaft
alignment (if
equipped with
marine gear)
●
Initial 50
●
Check hydraulic
oil cooler
●
Check and
replace
rubberized ho-
ses (fuel and wa-
ter)
●
Check flexible
engine mounts
○ ●
* Check anodes periodically. Any anode having less than half its original size remaining should be replaced -
use this to establish a regular replacement interval.
Note: These procedures are considered
normal maintenance and are performed at
the owner’s expense.
PERIODIC MAINTENANCE
BY Series Operation Manual 45
© 2008 Yanmar Marine International