2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 106Get this manual
EFIIgnition Systems Turbocharger Inspection WARNING
The turbochargerexhaust system generates extreme heat and house rotating parts which can cause severe injury and burnsNever touch any part of the turbochargerexhaust system while the engine is running or until the engine has been shut off and been allowed to sufficiently coolDo not allow objects such as clothing, hair or body parts to come into contact with or enter the compressor or turbine housing while the engine is runningThe turbocharger uses the energy of expanding exhaust gases exiting the engine to power turbine and compressorIntake air is drawn into the compressor impeller and pre-compressed before entering the combustion chamberThe intake compressor is connected by common shaft with the exhaust turbineThe shaft's bearings are lubricated with engine oilThe turbocharger on the FST is not liquid-cooledMaximum turbinecompressor RPM can reach 200,000 RPMBecause of the precise manufacturing tolerances and shaft balancing, turbocharger disassembly is never recommendedNever attempt to remove carbon build-up from the turbine bladesReplace the turbocharger assembly when: Damage to the compressor andor turbine blades is found The turbinecompressor shaft seal failure (Burning oil) The turbocharger makes "howling" or "whining" sound when engine RPM is increased or decreased(Bearing failure or compressorturbine blade damage)