The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | 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 | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Unexpected turbo whine caused by dying engine mounts?
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by MS (more from MS) on Mon, 11 Jun 2001 17:55:41 Share Post by Email
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

It was a beautiful day for replacing the starter and power steering pump on my venerable 82T. Exhaust manifold had to be removed to get at the starter. While under there I decided to clean and check whatever I could. Discovered the turbo oil return line connection (big nut) on the engine block was loose - that explained a mystery oil leak. I then decided to remove the return pipe for an inspection and cleaning. Lots of gritty stuff inside the first bend attached to the turbo. The Turbo return port was also impacted with grit (hardened oil from a hot turbo shaft). I cleaned all that grit out as best I could, installed a fresh gasket, tightened everything up, job done. Time for a test drive.

To my surprise, I'm now hearing a serious whining sound from the turbo upon boost. The max boost (10 psi)is fine, and a recent inspection of the turbo shaft turned up no excess play or unusual binding. By cleaning out the gunk at the return port, thus freeing up the oil flow, how would that have negatively effected the turbo? Or is that normal?

One possibility is that with all my recent successful efforts to remove all possible vacuum leaks and obtain maximum stock performance (now at 10 psi), I've also increased the load stress on the tranny, engine mounts, drive shafts, bearings and so forth. I can now feel considerable engine torque at max boost where I didn't before. I've also recently noticed considerable vibration at certain engine rpm's which suggests the strong possibility of bad engine mounts. So if the mounts are dying and getting more dead with each drive, and considering that I first noticed the excess turbo whine (and increased vibration) after my WOT test drive last night, maybe I shifted the engine weight that much more against the chassis frame, thus causing the normal sound of the turbo to reach the inside of the cabin that much more effectively.

As far as noises reaching the cabin, I do know that the flexible rubber tube connected to the clutch line just outside the slave cylinder absorbs sounds from the primary gear and clutch. When I replaced that strip of rubber tubing (which had ruptured) with copper tubing on a previous 900, I immediately noticed the sounds from the clutch area making their way into the cabin.

I'm trying to convince myself that the turbo is fine. And that the vibration isn't a dying tranny, pinion bearing or drive shaft. I'd much rather replace engine mounts than a tranny.

Anyone had this experience?
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
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 - Members see fewer ads. - 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: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
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 | Run Club Menlo Park | ScreenBot


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!