3116 and 3126 HEUI Truck Engines Turbocharger – Inspect

An inspection/check of your turbocharger will minimize unscheduled downtime and reduce the chance for potential damage to other engine parts.

Removal and Installation

For removal and installation, or repair/replacement options of turbochargers, see your Caterpillar dealer. Refer to the Service Manual for this engine or consult your Caterpillar dealer for the procedure and specifications.

1. Remove the exhaust outlet and air inlet piping from the turbocharger. Visually check for oil leaks.

2. Turn the turbine and compressor wheel by hand. The assembly should turn freely.

3. Inspect the turbine wheel and compressor wheel for contact with the turbocharger housing. There should NOT be any visible signs of contact between the turbine or compressor wheels and the turbocharger housing.

4. Check the compressor wheel for cleanliness. If only the blade side of the wheel is dirty, dirt and/or moisture is passing through the air filtering system. If oil is found only on the back side of the wheel, it indicates a possible turbocharger oil seal leak.

The leak may be the result of extended engine operation at low idle or an inlet air line restriction (plugged air filters), which causes the engine to “slobber”.

Maintain the compressor wheel/turbine housing by cleaning with standard shop solvents and a soft bristle brush.

5. Check the end play and bearing clearance on the turbine wheel and shaft. If the measurements are not within specifications (see the Service Manual), the turbocharger must be repaired or replaced.
6. When installing or replacing V-band clamps, position the gap (tightening screw) down if possible so any accumulation of moisture will drain away.

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