2. Drain the engine cooling system, and compressor cylin-
around the unloader pistons. If there is no noticeable leak-
der head and block.
age at the unloader pistons, the discharge valves may be
3. Disconnect all air, water and oil lines to and from the
If the compressor does not function as described above, or
leakage is excessive, it is recommended that the nearest
4. Remove the compressor mounting bolts. Then remove
Bendix-Westinghouse distributor be contacted for repair
the compressor from the engine.
information, or that the compressor be returned for a fac-
tory rebuilt unit under the repair exchange plan.
Installation of the air compressor is basically the reverse of
removal. However, to ensure proper performance of the
Air compressors furnished on Cummins engines are
compressor, the following should be inspected before ac-
serviced by authorized Cummins distributors.
tually installing the compressor:
1. Clean oil supply line. Before connecting this line to the
compressor, run the engine briefly to be sure oil is flowing
These instructions are general and would apply to compres-
freely through the supply line.
sors on both GM and Cummins engines, with the major
2. Clean the oil return line; this line must be unrestricted so
difference being the location of the compressors. To re-
oil can return to the engine.
move the compressor, proceed as follows:
1. Drain the air from the system by opening the drain
3. Always use a new mounting gasket. Be sure the gasket is
cocks on each air tank.
properly aligned on the compressor.