Chapter 1
BASIC SAFETY PRECAUTIONS
1-6
Caution Other Cautions
Never modify engine
Unauthorized modification of the engine will void
the maker's warranty.
Modification of the engine may not only cause
engine damage but may result in personal injury as
well.
If there is a need to modify the engine, please con-
tact a Mitsubishi dealer.
Never break seals
To ensure proper engine operation, the fuel control
links are attached with seals that prevent accidental
change of the injection volume and rotation speed
settings. Operating the engine without these seals
in place can result in the following problems, and
also invalidates the warranty.
• Rapid wear of moving and rotating parts
• Engine damage such as seizing of engine parts
• Increased consumption of fuel and lubricating oil
• Degradation of engine performance due to
improper balance between fuel injection volume
and governor operation.
Perform all specified pre-opera-
tion inspections and periodic
inspections
Conduct the pre-operation inspections and periodic
inspections as described in this manual.
Failure to conduct the specified inspections may
cause various engine problems and damage to
parts, as well as serious accidents.
Perform engine break-in
Break in a new engine by operating it with a light
load and at a speed lower than normal during the
first 50 hours of operation.
Operating a new engine under high load or severe
conditions during the break-in period can shorten
the service life of the engine.
Warm up engine before use
If the auxiliary devices for the starter (water heater,
engine oil priming pump etc.) are not installed, let
the engine idle for 5 to 10 minutes before using the
engine for work.
Warm-up operation circulates lubricants in the
engine and contributes to a longer service life and
economical operation.
Do not conduct warm-up operation for an extended
period of time. Prolonged warm-up operation
causes carbon build-up in the cylinders that leads
to incomplete combustion.
Never operate engine under over-
load condition
If the engine shows an overload condition such as
the emmision of exhaust smoke, decrease the load
immediately so that the engine operates at appro-
priate output and load.
Overloading the engine causes not only high fuel
consumption but also excessive carbon deposits
inside the engine. Carbon deposits cause various
problems and can shorten the service life of the
engine.
Conduct cooling operation before
stopping engine
Before stopping the engine, let it idle at low speed
for 5 to 6 minutes to cool.
Stopping the engine immediately after high-speed
operation can cause engine parts to heat up and
shorten the service life of the engine.
During cooling operation, check the engine for
abnormalities.
Do not splash water on engine
Do not allow rainwater, etc., to enter the engine
through the air inlet or exhaust openings.
Do not wash the engine while it is in operation,
since the engine may suck in the cleaning fluid
(water). If the engine is started with water inside the
combustion chambers, water hammer action can
damage the engine and result in serious accidents.
