Observable Diagnostics and Tests
04
150
14
RG,RG34710,1548 –19–24SEP02–1/1
Inspect Thermostat and Test Opening
Temperature
RG5971 –UN–23NOV97
Testing Thermostat Opening Temperature
Visually inspect thermostat for corrosion or damage.
Replace as necessary.
Test thermostat as follows:
CAUTION: DO NOT allow thermostat or
thermometer to rest against the side or bottom
of container when heating water. Either may
rupture if overheated.
1. Remove thermostats. See REMOVE THERMOSTATS
in Section 02, Group 070.
2. Suspend thermostat and a thermometer in a container
of water.
3. Stir the water as it heats. Observe opening action of
thermostat and compare temperatures with
specification given in chart below.
NOTE: Due to varying tolerances of different suppliers,
initial opening and full open temperatures may
vary slightly from specified temperatures.
THERMOSTAT TEST SPECIFICATIONS
Initial Opening Full Open
Rating (Range) (Nominal)
71°C (160°F) 69–72°C (156–162°F) 84°C (182°F)
77°C (170°F) 74–78°C (166–172°F) 89°C (192°F)
82°C (180°F) 80–84°C (175–182°F) 94°C (202°F)
89°C (192°F) 86–90°C (187–194°F) 101°C (214°F)
90°C (195°F) 89–93°C (192–199°F) 103°C (218°F)
92°C (197°F) 89–93°C (193–200°F) 105°C (221°F)
96°C (205°F) 94–97°C (201–207°F) 100°C (213°F)
99°C (210°F) 96–100°C (205–212°F) 111°C (232°F)
4. Remove thermostat and observe its closing action as it
cools. In ambient air the thermostat should close
completely. Closing action should be smooth and slow.
5. If any thermostat is defective on a multiple thermostat
engine, replace all thermostats.
CTM100 (06APR04)
04-150-14
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=362
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