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 401 of 736

TM 9-2815-225-34&P

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FUEL PUMP TESTING AND CALIBRATION (Contd)

CHECKING AND ADJUSTING THROTTLE LEAKAGE (Contd)

9.

Check deceleration time when engine (1) is shut down.

10.

Decrease leakage by turning threaded stud (3) out until engine (1) tends to stall after deceleration

to high idle.

11.

Turn in threaded stud (3) until deceleration is increased 1-2 seconds. Lock threaded stud (3) with

jamnut (2).

12.

Recheck idle speed and readjust as necessary.

NOTE

Engine power cannot be set accurately in any other way except

on engine dynamometer. Fuel pump adjustments must not be

made on an engine when the engine power comes from an

estimate. Before any adjustments on the fuel pump are made,

the following engine performance data must be checked so that

adjustments are justified.

13.

Check fuel rail pressure, fuel rate, speed setting, smoke, coolant temperature, combustion

smoothness, exhaust restriction, fuel quality, air intake restriction, engine oil level, and engine

power reducing factors.

14.

Check engine power by rechecking setting point of governor speed cutoff and readjust if necessary.

Figure 3. Checking and Adjusting Throttle Leakage.

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