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TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download

Page 211 of 1205

TM 9-2320-387-24-l REFERENCE INFORMATION COMPRESSION / MECHANICAL - -I BAlTERY STEIICE-R 1. Start Test 67, Battery Voltage. 2. Displayed reading is in volts. Batteries should be 23-25.5 volts. Batteries voltage will drop when glow plugs turn on. STARTER AVERAGE CURRENT STEIICE-R TEST 71 a peak of over 400 amps. I d The starter circuit tests begin on page 2-247. Internal engine problems (tight main or rod bearings for example) or drivetrain problems could still cause the engine to crank slowly even if the starter and battery circuits are OK. 0 11 . . - : WARNING Be sure to disconnect fuel solenoid (wire 54A) to prevent accidental starting. Failure to do so may result in injury to personnel or damage to equipment. A breaker bar and socket placed on the crankshaft pulley can be used to try to turn the crankshaft. The crankshaft pulley is located directly under the engine cooling fan. It can be reached from under the HMMWV. If the engine won’t turn. remove the glow plugs and try again. If the engine turns now, try cranking it and look for fuel at the eight glow plug holes. If you see fuel at any of the holes, the engine may have had hydrostatic lock. Crank the engine for about 15 seconds to clear the fuel, re-install the glow plugs and try to start the engine. If it still won’t crank, notify DS maintenance (chapter 14). STARTER FIRST PEAK CURRENT STUICE-R TEST 72 1. Dtsconnect wire 54A at injection pump to prevent starting. 2. Disconnect glow plugs controller and fan solenoid. 3. Start Test 72. Current First Peak. 4. Wait for the GO message. Crank the engine. 5. Result is displayed in amps. Starter first peak should be over 400 amps. BAlTERY INTERNAL RESISTANCE STEIICE-R TEST 73 1. Disconnect wire 54A at injection pump to prevent starting. 2. Disconnect glow plugs controller and fan solenoid. 3. Start Test 73. Battery Internal Resistance. 4. Wait for the GO message. Crank the engine. 5. Result is displayed in milliohms. Battery resistance should be 25 milliohms max. STARTER CIRCUIT RESISTANCE STEIICE-R TEST 74 1. Disconnect wire 54A at injection pump to prevent starting. 2. Disconnect glow plugs controller and fan solenoid. 3. Start Test 74, Starter Circuit Resistance. 4. Wait for the GO message. Crank the engine. 5. Result is displayed in milliohms. Starter circuit resistance should be 25 milliohms max. 2-153