Yanmar 4JH3-TE, Operation Manual

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46 5. MAINTENANCE & INSPECTION
(4) Checking and Replacing the fuel pipe and the cooling water pipe
This maintenance requires specialized knowledge. Consult your Yanmar dealer or distributor.
Check the hoses of the fuel and cooling water pipings and replace if damaged.
(5) Replacing the Mixing Elbow
This maintenance requires specialized knowledge. Consult your Yanmar dealer or distributor.
The mixing elbow which is constantly in contact with exhaust gas and seawater deteriorates with use and
must be replaced. If operation is continued without replacing faulty elbow, water will leak into the boat, and
gas leakage may result in fires.
(6) Lapping of Intake/Exhaust Valves
This maintenance requires specialized knowledge. Consult your Yanmar dealer or distributor.
Adjustment is necessary to maintain proper contact of the valves and seats.
(7) Checking and Adjusting the Fuel Injection Timing
This maintenance requires specialized knowledge. Consult your Yanmar dealer or distributor.
Fuel injection timing must be adjusted to ensure optimal engine performance.