Turbo starting to leak - Saab 900 Bulletin Board - Saabnet.com
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Thank you for your post!
The 1986 SAAB 900 would employ the GARRETT TB03 turbocharger which are reliable if kept lubricated and balanced.
The TB03 internal oil seals are of a piston ring(Gapped) type, and may allow for oil bypassing if there is any restrictions to turbocharger oil return. Any positive crankcase ventilation entering the engine's sump, could create resistance to the turbocharger oil return, and could result in oil bypassing at the gapped turbocharger oil seals. Check that the one way air pressure check valve installed on the vacuum line, connected to the valve cover, and make certain that this is fully functioning.
Also, the TB03 turbochargers are installed using paper oil inlet and return gaskets which are known to allow for bypassing if the cap head hardware loosens, etc.
Before suspecting the turbocharger as being problematic, we will typically suggest checking the rotating assembly which may will removal of the turbocharger induction boot(Large central rubber boot). Reaching your fingers into the rotating mechanism, attempt to fully rotate, then check for in and out thrust which should not exist. Due to the TB03 floating journal bearings, there should be a slight movement in an up and down motion. If there is any thrust or excessive movement on an axial motion(Up and down), the rotating assembly should be replaced. Many shops opt to replace the internal cartridge of the TB03 assembly as this reduces overall costs.
Thanks again for your post, and we will look forward to hearing relative to your project!
Gary K. at SWEDISH DYNAMICS, INC.
->Posting last edited on Sun, 28 Oct 2018 11:51:02.
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