○: Check or Clean ◊: Replace ●: Contact your authorized Yanmar marine dealer or distributor
System Item Periodic Maintenance Interval
Daily 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
Air Intake
and
Exhaust
System
Clean intake silencer (air
cleaner) element
○
Clean or replace the
exhaust / water mixing
elbow
○ ◊
Clean the turbocharger* -
4JH4-TE or 4JH4-HTE only
●
Check diaphragm assembly
3JH4E / 4JH4AE only
●
Electrical
System
Check the alarm and
indicators
○
Check the electrolyte level in
the battery
○
Adjust the tension of the
alternator V-belt or replace
V-belt
○
Initial 50
○ ◊
Check the wiring connectors ○
Engine
Cylinder
Head and
Block
Check for leakage of fuel,
engine oil and engine
coolant
○
After
starting
Tighten all major nuts and
bolts
●
Adjust intake / exhaust valve
clearance
●
Initial 50
●
Miscellane-
ous Items
Check the remote control
cable operation
○ ○
Initial 50
●
Adjust the propeller shaft
alignment
●
Initial 50
●
Replace rubberized hoses
(fuel and water)
Replace every 2 years or every 2000 hours, whichever comes
first.
*
For EPA requirements, see Inspection and Maintenance of EPA Emission-Related Parts on page 60.
Note: These procedures are considered normal maintenance and are performed at the
owner’s expense.
PERIODIC MAINTENANCE
JH4 Series Operation Manual 59
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