User Manual

52 RENR9968-02
Testing and Adjusting Section
1. Ensure that the engine is cool. Loosen the filler
cap slowly and allow pressure out of the cooling
system. Then rem ove the filler cap from the
radiator.
2. Ensure that the coolant level is above the top of
the radiato r core.
3. Install the 9S-8140 Pressurizing Pump onto the
radiator.
4. Take the pressure reading on the gauge to 20 kPa
(3 psi) more than the pressure on the fi ller cap.
5. Check the radiator for leakage on the outside.
6. Check all connection points for leakage, and
check the hoses for leakage.
The following conditions exist if the coolin g system
does not have external leakage:
•
Youdonotobserveanyoutsideleakage.
•
The pressure reading on the cooling system
remains steady after five minutes.
The following conditions exist if the coolin g system
has internal leakage:
•
The pressure reading on the cooling system
decreases in a five minute period.
•
Youdonotobserveanyoutsideleakage.
Repair the cooling system, as required.
Test for the Water Temperature
Gauge
Table 14
Tools Needed
Part
Number
Part Name
Quantity
4C-6500
Digital Thermometer 1
Note: Caterpillar E le ctro nic Techn ician (ET) can
also be used in order to display the engine’s coolant
temperature.
Personal injury can result from escaping fluid un-
der pressure.
If a pressure indication is shown on the indicator,
push the release valve in order to relieve pressure
before removing any hose from the radiator.
Making contact with a running engine can cause
burns f rom hot parts and can cause injury from
rotating parts.
When working on an engine that is running, avoid
contact with hot parts and rotating parts.
Check the accuracy of the water temperature
indicator or water temperature sensor if you find
either of the following conditions:
•
The engine runs at a temperature that is too hot,
but a normal temperature is indicated. A loss of
coolant is found.
•
The engine runs at a normal temperature, but a
hot temperature is indicated. No loss of coolant is
found.
g01388322
Illustration 43
Removeap
lug from water manifold assembly (2).
Install the thermometer into the open port:
•
The 4C-6
500 Digital Thermometer
Any temperature indicator of known accuracy can
also be u
sedtomakethischeck.