Quantcast d.  Smoke Level Check

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TM 9-2815-225-34&P 3-92.  ENGINE DYNAMOMETER TESTING (Contd) LOCATION/ITEM ACTION REMARKS c.  Power Check (Contd) NOTE After each test, check for fuel, air, water, oil, or exhaust leaks and correct as necessary. b.  Apply dynamometer test stand Engine (8) at normal oil (3) load as engine (8) rpm is operating temperature. increased until rated rpm and horsepower are reached and load is stabilized. d.  Smoke Level Check NOTE An accurate smoke reading can usually be obtained in 10 to 15 seconds. 9.   Opacity meter Zero and place at exhaust side of Use 0-20 scale on opacity meter. turbocharger.  Record reading. Remove opacity meter after reading is taken. (12.84 percent) (3.6 percent Bosch) 10.     Engine (8) Increase dynamometer test stand (3) load until rpm is reduced to 60 percent of rated rpm. 11.     Opacity meter Zero and place at exhaust side of Use 0-20 scale on opacity meter. turbocharger.  Record reading. Remove meter after reading is taken. (3.87 percent) (1.0 percent Bosch) 12.     Engine (8) Reduce dynamometer test Full acceleration should occur in stand (3) load and engine (8) rpm. 3-5 seconds. Accelerate engine (8) to rated rpm, no-load.  Return to idle. 13.     Opacity meter Zero and place at exhaust side of Use 0-100 scale. turbocharger. 14.     Engine (8) Accelerate engine (8) to rated rpm, Remove opacity meter after no-load.  Record highest reading. reading is taken. Return engine (8) to idle. (22 percent) (4.3 percent Bosch) e.  Final Check 15.     Crankcase pressure Check pressure at end of testing If there is no rapid change in blow-by measuring procedure.  If pressure is greater excess of 2 in. of water and tool (4) than specification listed in test reading does not exceed 100 chart, run engine (8) for additional percent of representative 30 minutes at 96-100 percent pressure, blow-by is acceptable. rated load and rpm. Manometer readings not exceed- ing 0.3 in. (7.62 mm) surge are desirable. 3-688


 


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