TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 209 of 1205
REFERENCE INFORMATION COMPRESSION / MECHANICAL i _ -I i 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, rewing 11 he engine could cause major damage (like a rod C :oming through the engine block). TM 9-2320-387-24-l CONTROLLER COMPRESSION UNBALANCE STEIICE-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. CAUllON The glow plug controller and the control valve electrical connector must be disconnected prior to running this test. 3. Disconnect glow plug controller and control valve electrical connector. GLOW PLUG 4. Start Test 14, Compression Unbalance. CONTROLLER HARNESS 5. Wait for the GO message. Crank the engine. 6. Release the rotary switch when the VfM displays OFF. A number less than 25% is passing. f the vehicle passes the STEKE-R Compression Jnbalance test, it may still have a compression jroblem, but it would mean that every cylinder has low nmpression. This is possible, but not too likely. If you tori’‘’ find a problem and suspect compression, notify IS maintenance (chapter 14) to measure :ompression. If STEXE-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 (PERCENT) STEIICE-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 STUICE-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. Drsplayed value is % POWER 2-151