CUMMINS N14 - FUEL DRAIN LINE RESTRICTION; AIR COMPRESSOR

Fuel Drain Line Restriction
Use pressure gauge, Part No. ST-1273, to measure fuel
drain line restriction.
NOTE: Do not measure fuel drain line restriction with the
fuel measuring device installed. This will not measure the
drain line restriction of the vehicle’s return plumbing.
Hold the gauge at the same level as the connection.
NOTE: The gauge will not measure the correct pressure if
the gauge is not held at the same level as the connection.
Air Compressor
NOTE: All air compressors manufactured by Cummins En-
gine Company, Inc. must be operating during the engine
run-in. During the performance check, all air compressors
must be in the unload or non-operating mode.
Connect a source of compressed air capable of produc-
ing 665 kPa [95 psi] to the air compressor unloader (1).
This air line must contain a valve between the source and
the unloader.
NOTE: The compressed air load in the accompanying il-
lustration must be attached to the air compressor outlet (2).
Use an air tank (2). Install an air regulator (3) capable of
maintaining 345 to 517 kPa [50 to 75 psi] air pressure at
both minimum and maximum engine RPM.
Install a steel tube or high temperature hose (1).
Hose Temperature (Minimum): 235°C [500°F].
Connect the tube or hose (1) to the air compressor outlet.
Engine Testing Engine Dynamometer - Install Engine (8-01)
N14 Page 8-15