3116 and 3126 HEUI Truck Engines Air-To-Air Aftercooler Maintenance

Inspect

Depending on your findings and operating environment, the maintenance interval for cleaning the air-to-air aftercooler may be more frequent.

A reduction in power or response, or an increase in exhaust temperature, may indicate an air leak in the charge air cooler core, a gasket failure, a duct failure, or a leak in the piping.

* Check the front of the aftercooler for inspects, dirt and other debris. Clean the front of the aftercooler when required with a stainless steel brush and soapy water. Clean dirt and debris from between the aftercooler and radiator.
* Inspect all of the air ducting and the gasket connections at each oil change. Constant torque hose clamps should be used to secure the ducting.
* Check all of the welds for cracks. Check the mounting brackets to ensure the mounting brackets are secure and in good condition.
* Examine fins for external damage, dirt, debris, salt corrosion, etc. Use a firm stainless steel brush to remove dirt, debris, salt, etc.
* Use compressed air to clean core blockage due to dirt and debris.

NOTE: Whenever air-to-air aftercooler parts are repaired and/or replaced, a leak test is highly recommended. Refer to SEHS8622, Using the FT-1984 Air-To-Air Aftercooler Leak Test Group, or consult your Caterpillar dealer for assistance.

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