TP-6198 3/1558 Section 5 Component Testing and Adjustment
Temperature Sensor (CTS)
The coolant temperature sensor (CTS) is used to
monitor engine temperature for the high engine
temperature fault shutdown (HE). See Figure 5-14 for
the coolant temperature sensor location. Set the
generator set master switch to the OFF position and
allow the generator set to cool. Disconnect the CTS and
use an ohmmeter to measure the resistance across the
sensor. The sensor resistance varies with temperature
and should be within the values shown in Figure 5-13. If
the resistance is very low (indicating a short circuit) o r
very high (indicating an open circuit) replace the CTS.
Temperature, _C(_F)
Resistance, Ohms
30 (86) 2100--2500
100 (212) 180--200
Figure 5-13 Coolant Temperature Sensor Resistance
Readings
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tp6198
1. Coolant temperature sensor (CTS)
Figure 5-14 Coolant Temperature Sensor (CTS)
Low Oil Pressure (LOP) Switch
Remove the LOP switch and install an oil pressure
gauge to verify that the engine oil pressure is within the
range specified in Section 1, Specifications, before
testing or replacing the LOP switch. See Figure 5-15.
To test the LOP switch, reinstall the switch and start the
generator set. If the unit shuts down, disconnect lead 13
from the LOP switch and reset the controller. Restart the
generator set and verify that it does not shut down. A
successful restart indicates a bad LOP switch. Replace
the switch.
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tp6198
1. Low oil pressure switch
Figure 5-15 Low Oil Pressure Switch Location (fan
guard removed)
5.11 Fuel Systems
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
Gas fuel leaks. Explosive fuel vapors can cause severe
injury or death. Fuel leakage can cause an explosion. Check
the LPG vapor or natural gas fuel system for leakage by using
a soap and water solution with the fuel system test pressurized
to 6--8 ounces per square inch (10--14 inches water column).
Do not use a soap solution containing either ammonia or
chlorine because both prevent bubble formation. A successful
test depends on the ability of the solution to bubble.
The fuel supplier provides and maintains manual
shut-off valves and the primary regulator. Verify that the
fuel system capacity is adequate to supply the generator
set plus all other gas appliances.
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