If the air compressor continues to pump (air pressure
continues to rise), the unloader valve is malfunctioning,
and must be repaired or replaced. Refer to Air Compres-
sor Unloader Valve, Procedure 012-013.
Remove the pipe plugs from the unloader ports used
for accessory air lines.
Install and tighten the accessory air lines.
Connect the line to the unloader valve.
Operate the engine and check for air leaks.
Air Leaks, Compressed Air System
Initial Check (012-019-001)
Compressed air can drive debris into eyes and
Keep head well away and wear
protective eye wear.
The illustrations shown will be of the single
cylinder air compressor.
procedures for SS, QE and ST model Holset
Shut off the engine.
Open the drain cock on the wet tank to release air from
the system. Close the drain cock after the pressure is