Inspection and Maintenance of EPA Emission-Related Parts
• Marine diesel engines less than 37 kW: 3JH4E is certified as EPA non-road engine
• Marine diesel engines greater than 37 kW: 4JH4AE, 4JH4-TE and 4JH4-HTE are certified
as EPA CI marine engines
Inspection and Maintenance of EPA Emission-Related Parts for Non-Road
and CI Marine Engines
Parts Interval
Clean fuel injection nozzle 1500 hours
Check fuel injection nozzle pressure and spray pattern 3000 hours
Check fuel injection pump adjustment
Check turbocharger adjustment (if equipped)
Check electronic engine control unit and its associated sensors and actuators
(if equipped)
Note: The inspection and maintenance items shown above to be performed at your Yanmar
dealer or distributor.
PERIODIC MAINTENANCE
60 JH4 Series Operation Manual
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