Chapter 2 NAME OF PARTS
2-4
Instruments
The instruments indicate the internal conditions of
the engine in operation. In normal operation, record
the numerical values indicated on the instruments
at regular intervals. If the numerical value is far dif
-
ferent from that in normal operation, the indications
of the instruments allow prompt judgment of engine
problems.
The instrument shape (round, square) and indica-
tion type (analog, digital) can vary depending on
the engine specifications.
Tachometer
This indicates the engine revolutions per minute
(rpm).
Note: The tachometer may have a built-in hour
meter.
Hour Meter
This indicator shows cumulative engine operating
hours.
Use the meter indication as a guigeline for deter-
mining the need for regular inspection and servic-
ing.
Oil Pressure Gage
This indicates the engine oil pressure.
Oil Temperature Gage
This indicates the engine oil temperature.
Jacket Coolant Temperature Gage
This indicates coolant temperature inside of the
crankcase.
Oil Cooler Coolant Temperature Gage
This indicates coolant temperature in the oil cooler.
Air Cooler Coolant Temperature Gage
This indicates coolant temperature in the air cooler.
Jacket Coolant Pressure Gage
This indicates the pressure of coolant in the crank-
case, cylinder heads and other parts.
Oil Cooler Coolant Pressure Gage
This indicates the coolant pressure in the oil cooler.
Air Cooler Coolant Pressure Gage
This indicates the coolant pressure in the air cooler.
Exhaust Temperature Gage
This indicates the temperature of exhaust gas at
the cylinder outlets or turbocharger inlet or outlet.
Fuel Pressure Gage
This indicates the pressure of fuel supplied to the
fuel injection pump by the fuel feed pump.
Inlet Pressure Gage
This indicates the pressure of inlet supplied to the
air cooler.
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