Turbo ID for rebuild - Saab 900 Bulletin Board - Saabnet.com
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SAAB 900 employed the GARRETT TB03 turbocharger for the APC controlled applications. 1985 saw use of the B202 engine, and larger compressor wheel trim(50) which was in service up to 1993. These turbochargers are also dynamic seal(Piston ring) type, and saw employment of the water cooled bearing housing in 1988.
The turbocharger will require proper oil return into the engine sump, and any problems such as crankcase ventilation conditions may create enough resistance to engine oil return at the turbocharger, and generate oil levels to build at the assemblies bearing housing which will bypass the piston ring oil seals typically creating smoke in the exhaust. Almost half of the 900 owners in this era will find the culprit to the turbocharger smoking to be crank case ventilation related which will not require a replacement of the turbocharger. The one way check valve at the valve cover will need to be checked to insure proper function.
Since you have access to your turbocharger's rotating components, a test of the shaft movement may be accomplished by putting your thumb and index finger on the end of the compressor wheel splined shaft nut, and attempt to move this nut in and out which should reveal zero thrust. Then check for minimal up and down for movement which should show minimal movement due to the "Floating" shaft bearings. Then, a full spin could be accomplished to test for restrictions or binding which would require a solution.
Most dealerships would replace the turbocharger if they found any thrust, lateral shaft play, or binding upon rotation of the shaft, and a cartridge may be a most cost effective method of repair as this is the working assembly of the turbocharger.
Thanks again for posting at TSN!
GSK at SDI
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