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 428 of 736
TM 9-2815-225-34&P
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0047 00-4
ENGINE TESTING (Contd)
BREAK-IN RUNNING
CAUTION
Once normal operating temperture is reached, oil pressure
must remain at or near a constant figure for a constant engine
speed and load. Acceptable lubricating oil pressures are 5–20
psi (34–138 kPa) at idle speed and 35–45 psi (241–310 kPa) for
Big Cam III and 40–75 psi (276–517 kPa) for Big Cam I at
rated speed. Abnormally high pressures may indicate blocked
lubricating oil lines. Abnormally low pressures indicate an
insufficient supply of lubricating oil from the pump or
increased engine clearance which may be due to bearing
failure. Damage to engine may occur if oil pressure fails
outside of acceptable range at indicated speeds.
Lubricating oil temperature must not rise sharply above 225° F
(107° C). Shut down engine and correct as necessary. Damage to
engine may occur if oil temperature rises above acceptable limit.
Check temperature of coolant. Temperature should not exceed
200° F (93° C) or drop below 160° F (71° C) during engine tests.
Do not turn engine off immediately after a load run. Heat
stored in engine will boil coolant in the water jackets if air and
coolant circulation are immediately stopped while engine is
hot. Allow engine to idle a minimum of 3 minutes before
shutting down.
Do not idle engine for prolonged periods of time before
completing break-in running. Failure to comply may result in
damage to equipment.
1.
Start engine (2) and idle at 1200 rpm no-load for 5–10 minutes. Operate air compressor (1) in
pumping mode.
2.
Check oil pressure, oil temperature, water temperature and inspect for leaks.
Figure 2. Break-In Running and Engine Test.
1
2
BLOW-BY
MEASURING
TOOL
DYNAMOMETER
TEST STAND
ORIFICE
ADAPTER
PRESSURE
RELIEF VALVE
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