Operation and maintenance manual

QSB4.5 and QSB6.7 Air Compressor Discharge Lines
Section 7 - Maintenance Procedures at 2000 Hours or 2 Years Page 7-1
Maintenance Procedures - Overview
General Information
All maintenance checks and inspections listed in previous
maintenance intervals must also be performed at this
time, in addition to those listed under this maintenance
interval.
Air Compressor Discharge Lines
General Information
All air compressors have a small amount of lubricating oil
carryover that lubricates the piston rings and moving
parts. When this lubricating oil is exposed to normal air
compressor operating temperatures over time, the
lubricating oil will form varnish or carbon deposits. If the
following maintenance check are not performed, the air
compressor piston rings will wear and not seal correctly.
Maintenance Check
WARNING
Wear appropriate eye and face protection when using
compressed air. Flying debris and dirt can cause
personal injury.
Shut off the engine.
Open the drain valve on the wet tank to release the
system air pressure.
Remove the air compressor discharge line from the air
compressor. Location of the air compressor discharge line
can be found in Flow Diagram, Compressed Air System in
System Diagrams (Section D).