TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 REFERENCE INFORMATION Change 1 2-147 This is not to evaluate driving performance. If the engine or the vehicle makes strange noises or vibrations at idle speed, don't rev the engine. If there is a problem internal to the engine, revving the engine could cause major damage (like a rod coming through the engine block). If the vehicle passes the STE/ICE-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 don't find a problem and suspect compression, notify DS maintenance to measure compression. COMPRESSION / MECHANICAL If STE/ICE-R is not available, accelerate under full power to a reasonable speed on a flat, level, paved surface. You have to decide from your own experience whether or not the engine is developing full power. A number greater than 75 is passing for test # 13. POWER TEST (% POWER) STE/ICE-R TEST 13 1. Start and idle engine. 2. Run STE/ICE-R test #10 to set idle and governor speed as necessary. 3. Start STE/ICE-R test #13. 4. When CIP appears on the display, press down sharply on the accelerator and hold it to the floor until the VTM displays OFF. 5. Displayed value is % POWER. COMPRESSION UNBALANCE STE/ICE-R TEST 14 1. Run tests 72, 73, and 74 to verify that the batteries are ok. 2. Disconnect wire 54A at injection pump to prevent starting. 3. Disconnect glowplug controller and control valve electrical connector. 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. CAUTION The glowplug controller and the control valve electrical connector must be disconnected prior to running this test.