TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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REFERENCE INFORMATION TM 9-2320-387-24-l STARTABILITY 0 11 . . WARNING A hot engine may cause serious burns. Always use caution when approaching a hot engine. NOTE When using the vehicle’s temperature gauge to determine engine temperature, don’t forget to turn the rotary switch to RUN. The gauges don’t work when power is off. The colder the engine (and air temperature), the more you need the glowplugs for starting. There are some times when you don’t need to run the glow plugs test. If the engine is warm and the problem is there on a hot day, then the problem is probably NOT the glow plugs or cold start advance, and these tests may be bypassed. If its colder than 50°F, run the glow plugs circuit test, because just a few bad glow plugs can make a minor starting problem much worse. If the vehicle passes the STUICE-R compression unbalance test, it may still have a compression problem, but it would mean that every cylinder has low compression. This is possible, but not too likely. If you’re confident that everything else is working properly, notify DS maintenance (chapter 14). COMPRESSION UNBALANCE STEKE-R TEST 14 1. Run tests 72. 73. and 74 to verify that the batteries are OK. CAUTION THE GLOW PLUGS CONTROLLER AND THE CONTROL VALVE ELECTRICAL CONNECTOR MUST BE DISCONNECTED PRIOR TO RUNNING THIS TEST. 2. Disconnect wire 54A at injection pump to prevent starting. 3. Disconnect glow plugs controller and control valve electrical connector (to keep waveform clean). 4. Start Test 14. compression unbalance. 5. Wait for the GO message. Crank the engine. 6. Release the rotary switch when the VTM displays OFF. A number less than 25% is passing. GLOW PLUG CONTROLLER HARNESS TIME-DELAY MODULE TIME-DELAY MODULE LECTRICAL CONNECT0 NO STEP 2-49/(2-50 blank)