TM 9-2320-209-10-1 FRAME 2 1. 2. 3. CAUTION Do not operate manifold heater unless engine is idling or being cranked. Engine can be damaged. While engine is being cranked, turn MANIFOLD HEATER SWITCH (1) to ON. The engine should start and run within 30 seconds. If engine does not start in 30 seconds, turn MANIFOLD HEATER SWITCH (1) to OFF and stop cranking engine. Wait two minutes and do steps 1 and 2 again above. NOTE If engine misses or does not run smoothly after starting, turn MANIFOLD HEATER SWITCH (1) ON for 30 seconds, then OFF. Wait a few seconds and do it again until engine runs smoothly. 4-42