Quantcast c. Power Check

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TM 9-2815-225-34&P 3-92.  ENGINE DYNAMOMETER TESTING (Contd) LOCATION/ITEM ACTION REMARKS c.  Power Check CAUTION Do not shut engine down immediately after power check is complete.  Serious engine damage will result. 8. Engine (8) a.  Run at 2100 rpm for 4 minutes.   Refer to power check in test chart. Check crankcase pressure with blow-by measuring tool (4).  Repeat procedure until engine (8) develops 96-100% rated horsepower at standard fuel rate within permissible crankcase pressure limit.  Operate air compressor (7) in non-pumping mode. 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  sudden  increase happens, or if it is more than 12" H2O, do the preceding test over again and run engine 15 more minutes.  When blow-by is OK, do next test.  If not OK, stop the test and find reason for too much blow-by.  Check engine for fuel, oil, water, air, or exhaust leaks after each test and fix as needed. Phase 1 - 25% HP @1200 RPM @160° water temperature. Phase 2 - 40% HP @1200 RPM Phase 3 - 65% HP @1600 RPM Phase 4 - 100% HP @ Nominal torque peak RPM *(1200) RPM Power Check - 96-100% HP @1600 RPM *100 RPM below torque peak RPM 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 3-687


 


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