MAINTENANCE SECTION 2 Page 35 4. Inspect any air driers, spitter valves, pressure relief valves, and alcohol injectors for carbon deposits or malfunctioning parts. Inspect for air leaks. Maintain and repair the parts according to the manufacturer’s specifications. 5. Remove the capscrews, the lock washers, and the flat washers that secure the unloader valve assembly to the cylinder head cover. Remove the unloader valve assembly and the spring from the cylinder head and the cover. A WARNING! Hold the unloader valve down when removing the capscrews. Personal injury can result from the sudden release of the spring-loaded unloader valve. Visually inspect the unloader valve for carbon buildup.
If carbon or heavy varnish is present, remove, clean, and inspect the compressor head and the valve assembly. Replace parts as neces- sary. Refer to the appropriate Air Equipment Manual listed below for procedures, or contact your nearest Cummins Authorized Repair Location: 0 OK Single Cylinder, Bulletin No. 3810242 If the unloader valve is clean or only lightly var- nished, install a new o-ring on the unloader body and a new rectangular seal inside the unloader body cavity. * The open side of the rectangular seal must face the top of the unloader body,