ENGINE CRANKS BUT FAILS TO START OR IS HARD TO START BELOW 32F (0C) (cont) -624880091

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. ENGINE CRANKS BUT FAILS TO START OR IS HARD TO START BELOW 320F (OOC) CONTINUED

a. If coolant heater (1) is working, go to step 2.

b. If coolant heater (1) is not working, replace (page 2-356).

WARNING

Although ignition lock switch must be on and battery ground cable connected to test

electrical circuit voltage, turn off ignition lock switch and disconnect battery ground

cable before doing resistance tests or replacing parts. This will keep you from getting

shocked and prevent damage to parts and equipment.

Ether burns easily. If engine starting aid is not properly installed, do not release ether in

confined areas or near open flame. Engine primer fluid cylinder is pressurized to expel

ether when fluid injection solenoid is activated. Do not heat engine primer fluid cylinder

or place it in fire.

Step 2.

Have assistant turn ignition lock switch (2) clockwise to ignition and press In and hold engine

starting aid solenoid switch (3) for a few seconds. Listen to engine primer fluid (4) for hissing sound

and solenoid (5) for click sound.

a. If click and hissing sounds are heard, go to step 14.

b. If click sound is heard, but no hissing sound is heard, have assistant turn ignition lock switch (2)

counterclockwise to off and go to step 13.

c. If no click or hissing sound is heard, have assistant turn Ignition lock switch (2) to off and go to

step 3.

Step 3.

Check solenoid terminals (6 and 7) and connector (8) for loose, corroded, frayed, and broken

connections.

a. If terminals (6 and 7) and connector (8) are not loose, corroded, frayed, or broken, go to step 4.

b. If connection on terminals (6 and 7) is loose, push connector (8) on all the way.

c. If connection on terminals (6 or 7) or connector (8) is corroded, clean using wire brush.

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