TM 9-2815-225-34&P 3-92.  ENGINE DYNAMOMETER TESTING (Contd) LOCATION/ITEM ACTION REMARKS NOTE At  each  phase,  record  crankcase  pressure  blow-by,  engine  speed,  and  load  at  one minute intervals.  Watch for increases or wide shifts in blow-by pressure.  If a sudden increase  in  blow-by  pressure  occurs  or  if  blow-by  exceeds  12"  H2O,  return  to  the previous phase test or repeat phase 1 test and operate engine an additional 15 minutes. If  blow-by  does  not  reach  an  acceptable  level  after  repeating  test  for  15  minutes, discontinue test and determine cause.  If blow-by is within an acceptable level, proceed to next phase test. After each test, check for fuel, air, water, oil, or exhaust leaks and correct as necessary. Lubricating oil level is checked only when engine is shut down or incorrect readings on dipstick will result. 5. Dynamometer test stand (3) a.  Perform phase 1 test.  Apply Refer to phase 1 test in test chart. load to engine (8) at ±10 percent horsepower, ±5 percent speed. Check crankcase pressure with blow-by measuring tool (4). Operate engine (8) until normal oil operating temperature is attained.  Stop engine (8) and check lubricating oil level.  Add lubricating oil to bring level up to H (high) on dipstick.  Allow oil temperature to stabilize.  Operate air compressor (7) in pumping mode. Table 3-1.  Dynamometer Test Chart ENGINE HP @ RPM RATED HP @ RPM 500 FT-ALT FUEL RATE LB/HR AIR MANIFOLD PRESSURE IN/HG ALTITUDE MAX. HP ALT. CRANKCASE PRESSURE W/TURBO T46B PHASE 1 TO 160°F HP @ RPM PHASE 2 2 MIN. HP @ RPM PHASE 3 5 MIN. HP @ RPM PHASE 4 4 MIN. HP @ RPM POWER CHECK 4 MIN. HP @ RPM NTC 400 400 @ 2100 400 @ 2100 139-145 39/47 12,000 12”H2O 100 @ 1200 160 @1200 260 @1600 Full Load @1200 384 @ 2100 3-684