INSTRUMENTS AND GAUGES
TESTING AND ADJUSTING
INSTRUMENTS AND GAUGES
OIL PRESSURE SENDING UNITS
SENDING UNIT FOR OIL PRESSURE
1. Terminal. 2. Fitting.
1.
Connect the sending unit to a pressure source
that can be measured with accuracy.
2.
Connect an ohmmeter between fitting (2) and
terminal (1).
3.
Take resistance readings at the pressure shown
in the chart.
5L7449 SENDING UNIT
PRESSURE
RESISTANCE (OHMS)
0 kPa (0 psi)
0 to 1
415 kPa (60 psi)
4.5 to 6.5
2050 kPa (300 psi)
28 to 31
5L7450 SENDING UNIT
PRESSURE
RESISTANCE (OHMS)
0 kPa (0 psi)
0
415 kPa (20 psi)
13.5
550 kPa (80 psi)
30
4.
If a unit does not have the correct resistance
readings, make a replacement of the unit.
WATER TEMPERATURE SENDING UNIT
1.
Connect an ohmmeter between terminal ( 1 )
and nut (2). Put bulb (3) in a pan of water. Do
not let the bulb have contact with the pan.
2.
Put a thermometer in the water to measure the
temperature.
SENDING UNIT FOR WATER TEMPERATURE
1. Terminal 2. Nut a Bulb.
3.
Take resistance readings at the temperatures
shown in the chart.
PART NO.
TEMPERATURE
RESISTANCE (OHMS)
5L7442
93°C (200F)
800 to 900
38°C (100°F)
403 to 493
5L7443
71C (160F)
118 to 138
104C (220F)
44 to 49
4.
If a unit does not have the correct resistance
readings, make a replacement of the unit.
ELECTRIC GAUGES
1.
Put the gauge in position with the letters
horizontal and the face 30 back from vertical.
WIRING DIAGRAM FOR TEST
1. Terminal (for test voltage). 2 Test resistance.
2.
Connect the gauge in series with the power
source and the middle test resistance shown in
the chart.
3.
Let the gauge heat at the middle resistance for 5
minutes, then check the pointer position for all of
the resistances given.
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