HARNESS AS-SWITCH 3628871 - Caterpillar

Probable Causes
High inlet air temperature
Incorrect base timing
Exhaust restriction
Buildup of deposits in the cylinder or internal oil leaksRecommended Actions
High Inlet Air Temperature
Use the Caterpillar Electronic Technician (ET) to check for the following event codes:
E026(3) High Inlet Air Temperature Shutdown
E027(1) High Inlet Air Temperature WarningIf one or more of the codes is active, refer to Troubleshooting, "Inlet Air Temperature (High)".Incorrect Base Timing
Verify that the base timing is correct. Refer to Systems Operation/Testing and Adjusting, "Ignition Timing - Adjust".Exhaust Restriction
Measure the exhaust restriction during engine operation with a load. For data that is specific to the engine, refer to the Technical Marketing Information (TMI).Investigate the cause of the exhaust restriction. Perform adjustments and/or make repairs, as needed.Buildup of Deposits in the Cylinder or Internal Oil Leaks
Use a borescope to inspect the cylinders. Look for the following conditions:
Deposits on the valve seats
Deposits on the valve faces
Deposits on the cylinder walls that are above the upper limit of the piston stroke
Signs of internal oil leaksOther signs of internal oil leaks include high oil consumption and blue smoke.Note: Excessive deposits contribute to guttering of the valves.If excessive deposits and/or signs of internal oil leaks are found, investigate the cause of the condition. Make repairs, as needed.