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 429 of 736
TM 9-2815-225-34&P
0047 00
0047 00-5
ENGINE TESTING (Contd)
ENGINE TEST
NOTE
At each phase, record crankcase pressure blow-by, engine
speed, and load at 1 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 in. 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.
Refer to Phase 1 Test in Dynamometer Test Chart for steps 1
through 7.
1.
Apply load to engine (2) at +/- 10 percent horsepower, +/- 5 percent speed.
2.
Check crankcase pressure with blow-by measuring tool.
3.
Operate engine (2) until normal oil operating temperature is attained.
4.
Stop engine (2) and check lubricating oil level.
5.
Add lubricating oil to bring level up to H (high) on dipstick.
6.
Allow oil temperature to stabilize.
7.
Operate air compressor (1) in pumping mode.
Dynamometer Test Chart
HP @
RPM
FUEL RATE
LB/HR
AIR
MANIFOLD
PRESSURE
IN/HG
CRANKCASE
PRESSURE
W/TURBO
T46B
PHASE 1
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
400
@ 2100
139–145
39/47
12 in.
H2O
100
@ 1200
160
@ 1200
260
@ 1600
Full Load
@ 1200
384
@ 2100
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