Chapter 1
BASIC SAFETY PRECAUTIONS
1-6
Other cautions
Never modify engine
Unauthorized modification of the engine will void the
manufacturer's warranty.
Modification of the engine may not only cause engine
damage but also produce personal injuries.
If there is a need to modify the engine, contact your
Mitsubishi dealer.
Never break the seals
To ensure proper engine operation, the fuel control
links are sealed to prevent accidental change of the
injection volume and rotation speed settings. Operat-
ing the engine without these seals in place can cause
the problems described below, and also invalidates
the warranty.
• Rapid wear of sliding and rotating parts
• Engine damage such as seizing of engine parts
• Considerably increased consumption of fuel and
lubricating oil
• Degradation of engine performance due to improper
balance between fuel injection volume and governor
operation or overrunning of the engine which could
result in a serious accident.
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, damage to parts, and
serious accidents.
Break-in the engine
To break in new engines or overhauled engines, oper-
ate the engine at a speed lower than the rated speed
in a light load condition during the first 50 hours of
operation.
Operating new engines or overhauled engines in a
severe condition during the break-in period shortens
the service life of the engine.
Warm up the engine before use
When starting auxiliary devices, such as a water
heater and an engine oil priming pump, are not
installed, let the engine idle for 5 to 10 minutes before
operating the engine for work. Warm-up operation cir-
culates lubricants in the engine and contributes to a
longer service life and economical operation. Do not
conduct warm-up operation for prolonged period of
time.
Prolonged warm-up operation causes carbon build-up
in the cylinders that leads to incomplete combustion.
Never operate the engine in an
overloaded condition
If the engine shows an overloaded condition such as
black exhaust smoke, reduce the load immediately to
operate the engine at an appropriate output and load.
Overloading causes not only high fuel consumption
but also excessive carbon deposits inside the engine.
Carbon deposits cause various problems and will
shorten the service life of the engine.
Conduct cooling operation
before stopping the engine
Before stopping the engine, let it idle at low speed for
5 to 6 minutes to cool down.
Stopping the engine immediately after high-load oper-
ation will cause engine parts to heat up and shorten
the service life of the engine.
During cooling operation, check the engine for abnor-
malities.
Protection of the engine against
water entry
Do not allow rainwater, etc. to enter the engine
through the air inlet or exhaust openings.
Do not wash the engine while it is operating. Cleaning
fluid (water) can be sucked into the engine.
Starting the engine with water inside the combustion
chambers can cause the water hammer action which
may result in internal engine damage and serious
accidents.
&$87,21
