Chapter 2 NAME OF PARTS
2-5
Engine Protection Devices
The engine protection devices activate an alarm when an abnormality occurs in the engine in order to protect
the engine and prevent serious problems and accidents. When a protection device is activated, stop the
engine, examine the cause of the abnormality, and take corrective measures.
If the cause of the problem is unknown, contact a Mitsubishi dealer.
Protection devices installed on the engine and their types (setting values) and shapes vary depending on the
engine specifications. The following describes the typical protection devices installed in a Mitsubishi engine.
Low Oil Pressure Alarm
The oil pressure switch activates an alarm when the engine oil pressure drops to an abnormally low level.
High Coolant Temperature Alarm
The high coolant temperature alarm device generates a warning or stops the engine when the coolant tem-
perature rises to an abnormally high level due to an engine malfunction or other reason.
Oil Filter Clog Alarm
The oil filter clog detector generates a warning when the oil filter becomes clogged and causes an abnormally
large pressure difference between before and after the oil filter. When it generates an alarm, replace it with a
new filter immediately and change engine oil, as well.
Overspeed Alarm
The overspeed alarm device generates a warning and stops the engine operation when the engine speed
starts operating at abnormally high speed due to an engine malfunction or other reason.
Air Cleaner Clog Alarm (Air Cleaner Indicator)
A red signal appears as a warning when the air cleaner
element becomes clogged and causes an abnormally
large pressure difference between before and after the
air cleaner. When a red signal appears, clean the air
cleaner element immediately or replace it with a new
element.
After the element is cleaned or replaced, press the
reset button located at the upper part of the indicator to
cancel the red signal.
While serving the air cleaner, do not enter dust into the
air cleaner or damage the element.
Reset button
Signal
fig.2-8 Air cleaner indicator
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