Valve Guide Seals or Turbo Leak? - Saab 900 Bulletin Board - Saabnet.com


[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Performance | Detail | Clubs & SOC | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Service/Mechs | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

C900 Bulletin Board
1979-1993 & 94 Conv [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only


[Main C900 Bulletin Board | Post Followup | BBFAQ ] [ Prev by Date ] [ Next by Date ] Member Login / Signup [Latest Member Gallery Photos]
Valve Guide Seals or Turbo Leak?
Like This Post:
Posted by SwedishDynamicsInc [Email] (#2304) [Profile/Gallery] (more from SwedishDynamicsInc) on Wed, 23 Jan 2019 14:08:53 Share Post by Email
In Reply to: Valve Guide Seals or Turbo Leak?, Saabina, Mon, 21 Jan 2019 14:07:24
Alert me when someone posts in this thread:

Saabina,

Thank you for your post!

The TE05 SAAB turbochargers have been one of our favorite 900 assemblies due to the quality of construction, and ease of servicing. The original turbine oil seal employed is a gapped carbon steel piston ring design allowing for thermal expansion, which has been commonplace for most turbocharger manufacturers for decades. The piston ring gap will always be reduced as temperatures increase, but this will also lower engine oil viscosities. The turbocharger turbine piston ring, however, is subject to wear over mileage wherein the gap will always increase in gap size as this occurs with an engine piston ring. This seal was only designed to combat a standard oil use, but will not be capable of eliminating oil bypassing when experiencing oil levels accumulating within the turbocharger's bearing housing. This may occur when the oil return is being inhibited by means of positive crankcase ventilation problems at the engine's oil sump, an over-filled oil sump, or damaged return pipe from the turbocharger to the oil sump.

To combat positive pressures from entering the crankcase, make certain that the one way check valve at the valve cover is functioning, and replace, if required. These valves are also notorious for tiring over time which will allow for the check valve to begin bypassing at a pressure "threshold" making them difficult diagnose...we typically recommend replacing all vacuum line and valve assemblies if questionable. Most shops test this valve by means of a miti-vac hand pump which will be tested from the check valve assemblies intake manifold connection. At this signal line, there should be an ability to draw vacuum at 15hg, but should seal/check when changing this tool to pos. pressures.

Also, B202 engine valve seal bypassing is very atypical due to the overhead design, and quality of valve guide and seal assemblies. Engine oil bypassing due to the valve seals should show signs within the engine combustion process, and may show as discoloration at a spark plug, when removed. Most valve seal issues would also show symptoms of bypassing upon initial engine start.

Thanks again for your post, and please inform us as to any progress!

Sincerely,

Gary K. at SWEDISH DYNAMICS, INC.

http://WWW.SAABPerformanceParts.com

->Posting last edited on Wed, 23 Jan 2019 22:19:28.


Posts in this Thread:
Alert me when someone 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.

Name: Member Login / Signup [Latest Member Gallery Photos]
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).


Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: [Member Only Feature] - Sign Up





The content on this site may not be republished without permission. Copyright © 1988-2020 - The Saab Network - saabnet.com.
For usage guidelines, see the Saabnet.com Mission and Purpose Page.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

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 - Poverty2Prosperity.org
Your address is: 75.101.220.230 - 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!