TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-’ ‘70-387-24-l REFERENCE INFORMATION FUEL SYSTEM i i If you are getting white smoke due to coolant entering the cylinders. you should notice a loss of coolant in the radiator or bubbles in the radiator tank while the engine is running. You may need to fill the radiator to proper level and recheck a day later to determine if there is a coolant loss. If you don’t detect coolant loss, you may have missed a fuel problem. Rerun the fuel system tests paying attention for a raw exhaust smell. If you still find nothing, you may have a small or inconsistant leak. Notify OS maintenance (chapter 14). 0 II . . WARNING Keep hands away from engine fan. Moving fan blades can cause serious injury. Use extreme caution when engine is running. If the engine doesn’t shut off with the solenoid disconnected, fuel is still reaching the cylinders- probably because the fuel solenoid is stuck open. When you squeeze the return line tight enough to prevent fuel flowing through it, you create a pressure imbalance inside the injection pump that will cause the engine to stall. 0 II .- : . . WARNING Disconnect negative battery cable before disconnecting and reconnecting protective control box harness. WARNING There is battery voltage at the PCB at all times. Failure to disconnect battery cable will result in damage to equipment or injury to personnel. Remember to reconnect any wires that may have been disconnected during troubleshooting. Repair/replace harness (para. 4-90). Replace PCS (para. 4-4). INJECTtGN PUMP DC VOLTAGE 0-45 VOLTS STEKE-R TEST 89 I 1. Connect RED clip to the indicated test point, BLACK clip to negative or ground. I 2. Start Test 89. DC Volts. I 3. Displayed reading is in volts. BATTERY VOLTAGE MULTIMETER 1. Set the voltmeter to a DC volts scale of at least 40 volts. 2. Connect the RED lead to positive and the BLACK lead to negative. 3. Be sure to read the correct scale. 2-133