TM 5-2420-230-24-2
Engine Dynamometer Test - Engine Run-In (14-02)
Section 14 - Engine Testing - Group 14
Page 14-14
B Series Shop Manual
To be able to unload the compressor, connect a source of
compressed air to the unloader (1). This air line must
contain a valve between the source and the unloader.
NOTE: All air compressors manufactured by Cummins En-
gine Company, Inc. must be loaded during engine run-in. All
air compressors must be unloaded during the engine per-
formance check.
NOTE: The compressed air load in the accompanying illus-
tration must be attached to the air compressor outlet (2).
To provide a load on the air compressor, connect an air
tank to the compressor outlet (2), using steel tubing or a
high temperature hose (1).
Install an air regulator (3) that can maintain tank air pres-
sure of 345 kPa to 517 kPa [50 psi to 75 psi] at both the
minimum and the maximum engine RPM.
Hose Temperature (Minimum):
260C [500F]
Inspect the voltage rating on the starting motor before
installing the electrical wiring.
Attach electrical wires to the starting motor and the bat-
teries, if used.
NOTE: If another method of starting the engine is used,
follow the manufacturer's instructions to make the neces-
sary connections.
Engine Dynamometer Test - Engine
Run-In (14-02)
The engine run-in period allows the tester to detect as-
sembly errors and to make final adjustments needed for
performance that meets specifications.
NOTE: The amount of time specified for the following engine
run-in phases are minimums. Additional time can be used at
each phase except engine idle periods, if so desired.
L-444
