WATER TEMP WARNING LIGHT AND BELL NOT OPERATING PROPERLY

TM 9-2320-285-24-1

2-20.

LIGHT SYSTEMS TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

WATER TEMP WARNING LIGHT AND BELL NOT OPERATING PROPERLY

Remove alarmstat sensor (para 2-32c).

Connect one lead of an ohmmeter to alarmstat sensor screw terminal and the other lead to alarmstat sensor case.

Place alarmstat sensor in pan of water and heat to 210 degrees F.

Ohmmeter should not indicate continuity until water reaches approximately 210 degrees F.

If continuity is not obtained until water temperature reaches approximately 210 degrees F, repair or

replace alarmstat sensor electrical leads (para 2-35d).

If continuity is obtained at lower temperatures, or continuity is not obtained at approximately 210

degrees F, replace alarmstat sensor (para 2-32c).

OIL PRESSURE WARNING LIGHT AND BELL NOT OPERATING PROPERLY

Step 1.

Turn key switch to on position; shut down engine.

Disconnect water level sensor leads (para 2-29).

OIL PRESSURE warning lamp shall light and warning bell shall sound.

If lamp lights and bell sounds, go to step 2 below.

If lamp does not light and bell does not sound, go to step 3 below.

Step 2.

Start engine.

Watch OIL PRESS gage and OIL PRESSURE warning light and bell.

Light should extinguish and bell should stop sounding when OIL PRESS gage indicates approximately

8-10 psi pressure.

If light extinguishes and bell stops sounding, no further action required.

If light does not extinguish and bell does not stop sounding, go to step 3 below.

Step 3.

With engine stopped, use an ohmmeter to check oil pressure sensor and electrical leads for continuity.

If continuity is not obtained, repair or replace electrical leads (para 2-35d).

If continuity is obtained, replace oil pressure sender (para 2-32a).

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