- Engine:
- G3512 (S/N: 4KC1-UP; 7NJ1-UP)
- G3512 SI TA (S/N: CRN1-UP)
- G3512 (S/N: WPR1-UP)
- G3516 (S/N: ZBA1-UP; 3RC1-UP; L6F1-UP; L6G2-UP; 4EK1-UP)
- G3516 SI TA (S/N: CSZ1-UP)
The turbochargers on certain G3500 engines have failed due to issues not related to materials or workmanship of the turbocharger. Oil supply contamination, foreign object damage, and turbo surge causing thrust bearing wear have been associated with failures. Further troubleshooting and inspection of the turbocharger is necessary to determine the root cause of the failure.
Oil Contamination
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| Illustration 1 | g03779987 |
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| Illustration 2 | g03779989 |
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| Illustration 3 | g03780069 |
If oil contamination is suspected, refer to the publications listed below.
- Operation and Maintenance Manual , "Caterpillar Machine Fluids Recommendations"
- Special Instruction, SEHS9597, "Instructions for the Service Replacement of the Turbochargers"
- Reuse and Salvage Guidelines, SEBF8018, "Visual Inspection of Turbochargers"
- Reuse and Salvage Guidelines, SEBF8019, "Specifications for Reusable Turbocharger Components"
- Reuse And Salvage Guidelines, SEBF9202, "Procedure for Repairing and Rebuilding 3400 and 3500 Series Turbochargers"
Thrust Bearing Damage
If turbocharger thrust bearing failure is suspected, refer to the publications listed below.
- Operation and Maintenance Manual, "Performance Parameters"
- Operation and Maintenance Manual, "Turbocharger - Inspect"
- Operation and Maintenance Manual, "Exhaust Bypass - Inspect"
- Operation and Maintenance Manual, "Carburetor Air/Fuel Ratio - Check/Adjust"
- Troubleshooting, "Engine Misfires, Runs Rough, or is Unstable"
- Special Instruction, SEHS9769, "Installation and Initial Start-Up Procedure for G3500"
Foreign Object Damage
If the turbocharger failure occurs due to foreign object damage, refer to the publications listed below.
- Engine News, SEBD9638, "Accurate Diagnosis of Turbocharger Failure on Caterpillar Engines"
- Operation and Maintenance Manual, "Turbocharger - Inspect"
- Operation and Maintenance Manual, "Exhaust Piping - Inspect"
For additional information, refer to your Core Acceptance Guide.