TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Air Leaks, Compressed Air System (012-019)
Section 12 - Compressed Air System - Group 12
Page 12-21
Operate the engine, and check for air leaks.
Air Leaks, Compressed Air System
(012-019)
Leak Test (012-019-014)
Shut off the engine.
Open the drain cock on the wet tank to release air from the
system. Close the draincock after the pressure is released.
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 in the following areas:
Unloader cover gasket
Unloader pin o-ring
Air compressor head gasket.
If air leaks are found, refer to the Master Repair Manual,
Holset Air Compressors, Bulletin No. 3666121 for repair
of these components.
L-1225