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Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes. |
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Check the turbocharger under the following conditions:
- 4800 hours of usage
- Any unusual noises from the turbocharger
- Any unusual vibrations in the turbocharger
A quick check of a turbocharger bearing's condition can be made without the disassembly of the turbocharger. Follow this procedure for this quick check:
- Remove the piping from the turbocharger.
- Inspect the following components of the turbocharger for any damage and for any deposits:
- Compressor impeller
- Turbine wheel
- Compressor cover
- Compressor impeller
- Rotate the turbocharger compressor wheel and the turbine wheel assembly by hand. Take extra care to feel for any excess end play and for radial clearance.
The turbocharger compressor wheel and the turbine wheel assembly should rotate freely without any rubbing and without any binding.
If the impeller rubs against the compressor cover or the turbine wheel rubs against the turbine housing, the turbocharger needs replacement or repair. For replacement, use a turbocharger that is new, reconditioned, or rebuilt.
| NOTICE |
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Do not use caustic cleaners to clean the air-to-air aftercooler core. Caustic cleaners will attack the internal metals of the core and cause leakage. |
Checking for End Play
Use a dial indicator to correctly check the end clearance.
- Attach a dial indicator with the indicator point on the end of the shaft. This can be seen in Illustration 1.
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| Illustration 1 | g00341132 |
Checking for Turbocharger Rotating Assembly End Play Typical Example | |
- Move the shaft forward and backward.
- Record the total reading of the indicator gauge.
Note: Refer to Specifications, "Turbocharger" for the correct end play dimensions.
If the end play is more than the maximum amount that is listed, replace the turbocharger. If the end play is less than the minimum that is listed, inspect the turbine wheel for any buildup. If any buildup is found, disassemble the turbine wheel for cleaning and for inspection.
A more reliable check of a bearing condition can only be performed after the turbocharger has been disassembled. Then, the following components can be precisely measured:
- Bearings
- Shaft journal
- Housing bore diameters