TM-9-2815-225-34-P
ENGINE, DIESEL: 6 CYLINDER IN-LINE TURBOCHARGED, CUMMINS MODEL NTC-400
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2005
TM-9-2815-225-34-P - Page 426 of 736
TM 9-2815-225-34&P
0047 00
0047 00-2
ENGINE TESTING (Contd)
GENERAL INFORMATION
The engine test is a combination of a run-in procedure and a performance check. The run-in procedure
provides an operating period that allows engine parts to achieve a final finish and fit. The performance
check confirms that the engine will operate at its specified speed and torque rating, that it is leak free,
that it is free of abnormal noises, and that its various systems are operating within specified values.
In the event of conflicting instructions between this procedure and other references, this procedure will
take precedence.
Dynamometer must have sufficient capacity to permit testing at 100 percent of engine’s 400 hp @
2100 rpm.
PRE-TEST INSPECTION
The engine will be inspected for completeness and obvious damage before testing/performance check
(no missing accessories, drive belts installed properly, no missing screws or nuts, etc.).
INSTALLATION OF ENGINE ON DYNAMOMETER
1.
Mount engine (4) on dynamometer test stand following manufacturer’s instructions.
2.
Cover, or plug, breather tube (2).
NOTE
Using blow-by measuring tool and water manometer, fill to 0
mark at middle of scale. Close all other engine openings that
would allow blow-by pressure to escape.
3.
Install blow-by measuring tool in place of oil filler cap (1).
4.
Connect air compressor (3) to a 0.125–0.130 in. (3.175–3.302 mm) diameter orifice adapter located
downstream from a 150 psi (1034 kPa) pressure relief valve.
CONDITIONS FOR TESTING
CAUTION
Failure to comply with the following could result in damage to
equipment.
1.
Do not run engine (4) with less than 35 psi (241 kPa) of oil pressure.
2.
Engine oil pressure must not exceed 90 psi (689.5 kPa) at any time.
3.
Engine oil temperature must not exceed 250° F (121° C) at any time.
4.
Engine coolant temperature must not exceed 210° F (96.0° C) at any time.
5.
Do not run engine (4) under full power/load conditions when oil temperature or coolant
temperature is below 190° F (88° C).
6.
Do not shut down engine (4) following heavy power/load runs without a minimum of a 5-minute
cool-down, no-load run.
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