FASTENER GP-ENCLOSURE 2602592 - Caterpillar

carbon deposits will be present in these components: air compressor cylinder head, compressor discharge line and line fittings
Discoloration of the compressor cylinders or the cylinder headIf any of these indicators are present, measure the coolant temperature at the coolant outlet port of the air compressor while the air compressor is operating under normal conditions. Refer to the air compressor's Service Manual for specifications that relate to coolant temperature for your application. If the cooling system is overheating, use the following procedure in order to locate the problem and repair the cooling system:
Remove any grease or dirt that may have accumulated on the air compressor's cooling fins. Clear any obstructions from the fins.
Inspect the coolant lines and line fittings for an accumulation of rust. Check the coolant lines for bends that are at sharp angles. Check for lines that are kinked. Reroute any coolant lines that have been routed poorly. Repair restricted lines and replace lines that are damaged.Ensure that the coolant lines are attached to the correct coolant port on the air compressor cylinder head. For information on identifying the locations of the coolant ports for your application, refer to the air compressor's Service Manual.
Install an in-line flow meter in order to check that the coolant flow through the air compressor is within specifications. Check the coolant flow at low idle and at high idle. Note: The state of the engine thermostat could affect the coolant flow through the air compressor. Be sure to check the coolant flow through the compressor with the thermostat in the open and in the closed position.Refer to the air compressor's Service Manual, "Specifications" for specifications that relate to coolant flow.
If the air compressor is located within 76 mm (3 inch) of an exhaust pipe or a turbocharger, some of the manufacturers require the installation of a heat shield in order to protect the compressor from radiant heat. If this is required, ensure that the heat shield is installed properly. Refer to the air compressor's Service Manual for more information.If the air compressor's cooling system conforms to all of the specifications that have been mentioned in the tests that have been outlined, and the coolant temperature at the coolant outlet port remains out of specifications, then the problem may be originating from the engine cooling system. Check the engine cooling system for proper operation. Repair any deficiencies that may be discovered.If the air compressor has been allowed to operate during an overheating condition, repair or the replacement of the air compressor will be necessary. Test the cooling system and make necessary repairs prior to allowing the system to return to normal operation.Troubleshooting the Air Compressor's Lubrication System
The engine provides a continuous supply of oil to the air compressor. Oil is routed from the engine to the oil inlet of the air compressor. This oil is used to lubricate all of the components of the air compressor. Return oil is allowed to drain back into the engine through the mounting flange of the air