Cummins 4BT – Air Compressor Timing – Installation

18 m m , 14 m m , 10 m m
Use a new gasket. Install the air compressor to the gear housing.
Install the air compressor support bracket.
Torque Values:
Mounting Nuts 77 N*m [57 ft-lb]
Support Capscrews 24 N*m [18 ft-lb]
NOTE: No timing of gears is necessary.

9/16 inch
Install the oil supply line.
Torque Value: 15 N«m [12 ft-lb]

15 mm
Install the oil drain to the bottom of the compressor.
Torque Value: 24 N»m [18 ft-lb]

15/16 in, 7/8 in
Caution: If rubber grommets are used on the coolant or air lines, be sure they are installed carefully to prevent
cuts or tears to the grommets which will cause leaks.
Install the coolant lines.
Torque Value: 24 N»m [18 ft-lb]

Install the air lines.

Fill the engine cooling system (liquid cooled air compres­sor).
Operate the engine and check for leaks.

Operate the engine to activate the air compressor.
With the air compressor pumping between 550 to 690 kPa [80 to 100 psi], use a solution of soapy water to check for
air leaks.