Turbo starting to leak - Saab 900 Bulletin Board - Saabnet.com
NG900 & OG93 |
Vintage Models |
Clubs & SOC |
Other Cars |
Member Photo Galleries |
Member Directory |
*Buddy Registry |
*Mileage Registry |
What's New |
Photo of the Month |
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.
Posts in this Thread:
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Your address is: 188.8.131.52 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!