TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 206 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

h. FLAME HEATER CIRCUIT (ENGINE MODEL

FLAME HEATER DOES NOT OPERATE

7083-7396) — CONTINUED

General mechanic’s tool kit (item 64, Appx H)

Two

Multimeters (item 36, Appx H)

TA-1 probe kit (item 43, Appx H)

(Long test leads may be needed for some tests;

Transmission left access door open (TM 9-2350-311-10)

16 AWG wire may be used as an extension.)

Air intake grille open (TM 9-2350-311-10)

WARNING

If flammable vapors are present, do not perform step

A. Performance of step A could cause fire or

explosion.

Do not touch coil assembly or air box heater while

performing step A. High voltage is present and

personal injury may result.

Fuel is hazardous waste and must be disposed of in

accordance with local procedures or direction of the

local Hazardous Waste Management office.

NOTE

Use a container to catch any fuel that may flow out of the

input and/or output hoses during the following steps.

Disconnect air box heater fuel input hose.

Remove air box heater with coil assembly to

.

air box heater lead attached (para 5-8).

3. Place a jumper wire from air box heater to

ground.

4. Turn MASTER and FLAME HEATER

switches ON.

5. Check for electric arc between electrode

and wire in air box heater. Arc should be

steady with a crackling sound.

6. Turn MASTER and FLAME HEATER

switches OFF.

Note results.

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