G3500 A3 Engines Caterpillar

High inlet manifold air temperature will reduce the power output of the engine. If the temperature is greater than the trip point, the ECM will generate a warning or a shutdown.

Use the Caterpillar Electronic Technician (ET) to monitor the inlet manifold air temperature. The temperature can be verified with the 4C-6500 Digital Thermometer.

Illustration 1	g00808566
Top view and right side view of the plug on top of the aftercooler

To measure the inlet manifold air temperature, use the 4C-6500 Digital Thermometer. Remove the plug from the top of the aftercooler. Insert a temperature probe in place of the plug. Measure the temperature when the engine is operating at full load.

If the inlet manifold air temperature is too high, inspect the thermostatic valve and the separate circuit's cooling system.