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 FUEL SYSTEM ._ -I Governor no-load speed is with the transmission in neutral. Loaded speed is with the transmission in gear and the vehicle moving. -It is the maximum rpm the engine will develop. The engine will surge at governor speed since the governor will try to lower the engine speed and the accelerator is trying to increase it. A number over 75 is passing for STE/lCE-R test 13. If the vehicle seems to be low on power while driving, you have to check for other things which could cause this such as the transmission. To try a road test, accelerate the vehicle from 0 to a safe and reasonable speed on a reasonably level road. ENGINE RPM STEIICE-R TEST 10 1. Start Test 10, Engine RPM. 2. Crank or start the engine. Displayed reading is RPM. Cranking rpm should be approximately 1W-200. Idle rpm should be 700-750. ENGINE POWER TEST (PERCENTI STUICE-R TESi 13 ’ 1. Set TEST SELECT switches to 13. 2. Press and release TEST button. 3. Watt for prompting message CIP to appear. 4. When CIP appears on display, press down sharply on engine accelerator and hold it to the floor. When VTM displays OFF, release accelerator. 5. A number will be displayed after the engine has returned to idle speed. This number is the test result in units of percent of nominal rated power. - : If the exhaust is not colorless. it must be either white, blue, or black. If exhaust color is: WHITE .._....... Go to G. page 2-126. Also could be injector timing. Notify DS maintenance (chapter 14). BLUE ...... .. ... . Blue smoke is a sign of oil entering the combustion chambers. It usually enters past the piston rings or intake valve stem seals. This is an internal engine problem that can’t be handled at this level of maintenance. You may want to run the engine running tests, page 2-51, before you notify DS maintenance (chapter 14). BUCK .. .. .. ... Air intake/exhaust, page 2-l 41. 2-105