Test For The Water Temperature Gauge

TM 9-2320-312-24-2

Testing and Adjusting Section

You do NOT observe any outside leakage.

The reading remains steady after five minutes.

The inside of the cooling system has leakage only if

the following conditions exist:

The reading on the gauge goes down.

You do NOT observe any outside leakage.

Make any repairs, as required.

Test For The Water Temperature

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Gauge

Illustration 76

Test Location

Table 22

(1) Plug

(2) Water temperature regulator housing

Tools Needed

Part

Remove the plug from one of ports (1). Install one

Part Name

Quantity

Number

of the following thermometers in the open port:

4C-6500

Digital Thermometer

The 4C-6500 Digital Thermometer

2F-7112

Thermometer

The 2F-7112 Thermometer

A temperature indicator of known accuracy can

also be used to make this check.

Personal injury can result from escaping fluid un-

der pressure.

Start the engine. Run the engine until the

temperature reaches the desired range according

If a pressure indication is shown on the indicator,

to the test thermometer. If necessary, place a

push the release valve in order to relieve pressure

cover over part of the radiator in order to cause a

before removing any hose from the radiator.

restriction of the air flow. The reading on the water

temperature indicator should agree with the test

thermometer within the tolerance range of the water

temperature indicator.

Making contact with a running engine can cause

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burns from hot parts and can cause injury from

rotating parts.

Water Temperature Regulator

- Test

When working on an engine that is running, avoid

contact with hot parts and rotating parts.

SMCS Code: 1355-081; 1355-081-ON

Check the accuracy of the water temperature

indicator or water temperature sensor if you find

either of the following conditions:

Personal injury can result from escaping fluid un-

The engine runs at a temperature that is too hot,

der pressure.

but a normal temperature is indicated. A loss of

coolant is found.

If a pressure indication is shown on the indicator,

push the release valve in order to relieve pressure

The engine runs at a normal temperature, but a

before removing any hose from the radiator.

hot temperature is indicated. No loss of coolant

is found.

1. Remove the water temperature regulator from

the engine.

Coolant temperature can also be read on the display

screens of the Electronic Service Tool (ET or ECAP).