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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 3-6.  MEASURE ENGINE BLOW-BY. a. Place a hose with a standard gas gage in end of crankcase vent tube. b. Run  engine  at  rated  speed  and  load  (engine  at  operating  temperature  and  run-in,  with  at  least  100  operating hours). c. Measure blow-by over a period of 5 minutes.  Multiply figure obtained by 12 (hourly rate).  Maximum allowable blow-by is 225 cu ft/h (6.0 cu m/h) d. If blow-by is lower, there probably is no undue wear between piston rings and liners.  If blow-by is higher, there could be excessive wear between piston rings and liners, resulting in loss of engine power. 3-7.  INTAKE MANIFOLD PRESSURE CHECK. a. Remove plug from intake manifold and connect suitable gage to intake manifold, refer to FIGURE 3-1. FIGURE 3-1.  Connecting Test Gage to Intake Manifold b. Run engine to bring up to normal operating temperature.  (From a cold start, operate engine 10 to 15 minutes at slow idle.) NOTE Engine speed and load should be stabilized before taking readings on gage.  Be sure that gage works properly. 3-19


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