- Engine:
- 3608 (S/N: 6MC1-UP; 8LL1-UP)
- 3616 (S/N: 1PD1-UP)
.
Napier NA 297 turbochargers will replace ABB VTC 254 turbochargers on the above engines in the applications that follow:
- All 900 rpm and 1000 rpm Marine ratings
- All fast vessel ratings
- All front mounted turbocharger
- All 900 rpm and 1000 rpm generator sets
The new turbocharger has the following features:
- Turbocharger bearings that are lubricated by the lube oil system of the engine
- A turbine housing that is not water cooled
- A higher pressure ratio across the compressor
The higher pressure ratio across the compressor provides the following benefits:
- Increased inlet manifold pressure at maximum power
- Increased turbocharger efficiency
- decreased emissions
- decreased temperatures at the turbine inlet
The Special Instruction, REHS0285, "Disassembly and Assembly of the Napier NA 297 Turbocharger" is available from normal literature ordering channels. The Special Instruction provides the information that follows:
- Identification of special tools that are needed for disassembly and assembly
- Details about the disassembly and assembly procedures of the turbocharger
- Details about the disassembly and assembly procedures of the major components of the turbocharger
Maintenance Practices
The maintenance intervals for the turbocharger will depend on the following criteria:
- Operating conditions of the turbocharger
- Quality of the engine oil
- Condition of the engine oil
Turbocharger Turbine Wheel, Turbine Nozzle, Compressor Wheel, and Diffuser
Clean and inspect the intake and the exhaust sides of the turbocharger after each 8,000 hours of operation.
Thrust Bearing
Clean and inspect the thrust bearing should be cleaned and inspected. If necessary, replace the thrust bearing.
Journal Bearings
Clean and inspect the journal bearings after each 8,000 hours of operation. If necessary, replace the journal bearing.
Balancing the Turbocharger Shaft, the Turbocharger Compressor Wheel, and the Turbocharger Turbine Wheel
The rotating parts of the turbocharger include the following parts:
- The turbocharger shaft and turbine wheel
- The turbocharger compressor wheel
Balance the rotating parts of the turbocharger at the Top End Overhaul or after every 18,000 to 24,000 hours of operation. Also, balance the rotating parts if any of the rotating parts experience damage or if any of the rotating parts are replaced. The rotating parts do not require balancing if the bearings are changed between the normal intervals for balancing.
Consult your local Caterpillar Dealer or the Caterpillar Service Center for any parts or service.
For a list of service centers, refer to Engine News, SEBD9827, "List of Caterpillar Service Centers for Napier Turbochargers".