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2. Operation and maintenance
Inspection and repair of the engine
Checking Engine Parts after Prolonged Oper-
ation
Wear, corrosion, or degradation of engine elements and
assemblies may occur, causing lowered performance of
engine parts. To maintain high engine performance, check
the engine after prolonged operation to enhance durability of
the engine.
Unexpected faults may occur in some weak engine parts
after normal operation of the engine, when operation time is
prolonged. In this case, it is difficult to maintain high engine
performance by simply repairing some parts. It is recom-
mended to replace or repair the entire related parts in order
to diagnose the causes more accurately and maintainhigh
engine performance.
To prevent engine failure in advance and use the engine
safely for a long period, perform periodic replacements and
inspections.
It is recommended to perform engine adjustments and
preventive inspections during spring after the engine was
exposed to winter or cold weather. This allows economic,
long-term use of the engine without faults.
As the following parts affect the engine output and perfor-
mance, they should be regularly checked and inspected.
1. Parts affecting intake and exhaust
• Air filter
• Inter cooler
• turbocharger, silencer
• Other parts
2. Parts affecting lubrication and cooling
• Air filter
• Oil filter
•
Antifreeze
• Other parts
Inspection and Repair of Turbocharger
As performance of turbocharger significantly affects the
engine performance, regular inspection and repair should be
made and inspection and maintenance regulations should be
observed.
Intake System
Be careful to handle air filter carefully. In regards to the dry
air filter, intake resistance should be small to ensure a
smooth intake of air.
Exhaust System
If exhaust gas is leaked from the connections in the exhaust
pipe, the turbocharger efficiency is lowered, causing
degraded engine output and seizure of related parts in the
worst case. As parts related to exhaust and turbocharger are
used at high temperature, be careful not to mix the bolts and
nuts with other parts when performing repair.
Lubrication System
Inspection and exchange of oil and oil filter should be
performed while considering their exchange cycle. Over-
heated engine oil significantly affects the engine perfor-
mance as well as the engine itself.
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