TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-l REFERENCE INFORMATION FUEL SYSTEM The engine temperature must be below 90° F (32°C) to get voltage here. If the engine is warm, either wait for it to cool, or go to step C3 at the bottom of the page and remember that the cold advance may be the problem if everything else checks out OK. The glow plugs or the intake/exhaust system may be faulty, so you should test them first. DC VOLTAGE O-45 VOLTS STEIICE-R TEST 99 1. Connect RED clip to positive, BLACK clip to negative or ground. 2. Start Test 89, DC Volts. 3. Displayed reading is in volts. BAlTERY VOLTAGE MULTIMETER 1. Set the voltmeter to a DC volts scale of at least 40 volts. The cold advance circuit advances the fuel injectton pump timing approximately 3 to 5 degrees during I cold start-up. If engine temperature is less than 90°F (32°C). then advance circuit operation may be 1 checked as follows: 4. Start the engine. Disconnect wire 6698 from the advance solenoid. If the circuit is working correctly, then engine rpm should decrease. Look at the advance mechanism on the right side of the fuel injection pump while you connect and disconnect 5698 with the engine running. The advance mechanism should move about l/4 in. If the advance mechanism is stuck, apply some oil at the points shown and try again. Remember to reconnect any wires that were disconnected during troubleshooting. 2. Connect the RED lead to positive and the BLACK lead to negative. 3. Be sure to read the correct scale. GLOW PLUG CONTROLLER NEL i301i~010 I ” WIRE 569B ADVANCE MECHANISM INJECllON PUMP AS SEEN FROM REAR OF ENGINE 2-115