BUSHING 1266917 - Caterpillar

Use this procedure in order to troubleshoot high intake manifold air temperature. Also, use this procedure if one of the following engine events is active. Refer to Troubleshooting, "Diagnostic Trouble Codes" for information about engine events. Access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Systems Operation, "Engine Monitoring System".
Table 1
Engine Events
J1939 Code and Description Conditions which Generate the Code System Response
105-0 Engine Intake Manifold #1 Temperature : High - most severe (3) The intake manifold air temperature is above the trip point for the programmed delay time. The code is logged.
105-15 Engine Intake Manifold #1 Temperature : High - least severe (1) The code is logged.
Engine power is derated. Probable Causes
High coolant temperature
High ambient air temperature
Air inlet restriction
Exhaust restriction
Altitude
Engine OverloadRecommended Actions
High Coolant Temperature
A high coolant temperature will increase the intake manifold air temperature.Verify that the cooling system is filled to the proper level. If the coolant level is too low, air will get into the cooling system. Air in the cooling system will cause a reduction in coolant flow.Check the operation of the cooling fan. A fan that is not turning at the correct speed can cause improper air speed across the aftercooler core. The lack of proper air flow across the aftercooler core can cause the intake air not to cool to the proper temperature.Check for air in the cooling system. Air can enter the cooling system in different ways. The most common causes of air in the cooling system are incorrect filling of the cooling system and combustion gas leakage into the cooling system. Combustion gas can get into the system through inside cracks, a damaged cylinder head, or a damaged cylinder head gasket.High Ambient Air Temperature
Determine if the ambient air temperature is within the design specifications for the cooling system. When ambient temperatures are too high for the cooling system rating, there is not enough of a temperature difference between the ambient air and coolant.Inlet Air Restriction
Check for a restriction in the air inlet system. A restriction of the inlet air can cause high cylinder temperatures. High cylinder temperatures cause higher than normal temperatures in the cooling system. The coolant temperature must be within the correct range in order to cool the intake air.Exhaust Restriction
Check for a restriction in the exhaust system. A restriction of the exhaust can cause high cylinder temperatures.Altitude
Consider high altitude operation. The cooling capability of the cooling system is reduced at higher altitudes. A pressurized cooling system that is large enough to keep the coolant from boiling must be used. Make sure that the settings for the engine are correct for the altitude.Engine Overload
The engine may be running in the lug condition. When the load that is applied to the engine is too large, the engine will run in the lug condition. When the engine is running in the lug condition, engine rpm does not increase with an increase