MANIFOLD HEATER OPERATION CHECK - TM-9-2350-256-20

TM-9-2350-256-20 Carrier Cargo Tracked 6-Ton M548A1 (2350-01-096-9356) M548A3 2350-01-369-6081 Manual
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SECTION II: PRIMARY, FUEL/WATER SEPARATOR, AND MANIFOLD TM 9-2350-256-20 HEATER FUEL FILTERS AND RELATED PARTS 4-22 MANIFOLD HEATER OPERATION CHECK INITIAL SET-UP Reference: Equipment Condition: TM 9-2350-256-10 Powerplant removed (see paragraph 3-1) WARNING Do not smoke or use open flame when working on fuel system: explosion may occur, causing severe injury or death. MANIFOLD HEATER OPERATION CHECK After maintenance has been performed on either the intake manifold heater or on the manifold heater fuel system, operation of the heater should be checked before installing the powerplant. To check manifold heater operation, proceed as follows: • Prepare the powerplant for operation outside the vehicle (see paragraph 3-1). • The main fuel line shutoff solenoid should be closed and the engine cranked to obtain an air supply to the manifold heaters. • Operate purge pump and simultaneously press heater button in pump handle. • If heater is operative, heat will be felt at intake manifold turbosupercharger tube. • If there is no heat, first check manifold heater accessory on which maintenance was performed. Check wiring harness and heater spark plug lead for faulty connections. Check installation of spark plug, nozzle, and fuel line fittings, and check operation of heater fuel supply and return solenoids. NOTE • Manifold heater operation can be checked with the powerplant in the vehicle by removing the engine deck (see paragraph 9-51) and placing a hand on the intake manifold downstream from the heater. • Follow-on maintenance: Install powerplant (see paragraph 3-1) 4-23 REPLACE MANIFOLD HEATER FUEL LINES AND FITTINGS THIS TASK COVERS a. Removal b. Installation INITIAL SET-UP Tools: Parts: Equipment Condition: Tool kit, general mechanic's • Nuts, self-locking (10) Powerplant removed (see (Appendix C, item 53) (Appendix G, item 172) paragraph 3-1) • Nut, self-locking (Appendix G, item 162) WARNING Do not smoke or use open flame when working on fuel system: explosion may occur, causing severe injury or death. 4-47

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