Trilobular background of the bolt issues - Saab 9-5 Bulletin Board - Saabnet.com
Click Banner for Details on this Saabnet.com Classified
Site News - 9/23 Horn Button Rebuild 900/9000 | 9/21 Abandoned Saab Dealership

[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]

95 Bulletin Board
1999-2009 [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only


[Main 95 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Trilobular background of the bolt issues
1 Saabers Like This Post!
Like This Post:
Posted by Name Left Blank (more from Name Left Blank) on Wed, 11 Nov 2020 23:35:25 Share Post by Email
In Reply to: Re: I agree with Boris, Dave The Ice Age Knave [Profile/Gallery] , Wed, 11 Nov 2020 15:35:00
Alert me when someone posts in this thread:
Members do not see ads below this line. - Support the Site - Signup

The problems with sway-bar mounting bolts come from the design. Saab from some model year, (somewhere after 2000, probably from 2002 for 9-5) used a novelty - self locking/tapping screws (they are called trilobular). They can roll a thread and lock themselves very effectively. Unfortunately this screw profile (shaped like rounded triangle) has one disadvantage - it's not watertight. Water can get into full length of the thread. Second problem in this joint is a gap just under screw head (bad metal mounting design) what enables water to flow under screw head and then into the thread. Usually soaking this kind of screw for several hours in rust solving agent helps and the joint could be loosened using back and forth technique. Do not use any impact tools here - it will just chop off the screw head. Just back & forth, back & forth, back...

I advice to throw away those magic "tri" screws and use standard metric ones with blue Loctite after tapping the nuts in the subframe. Remember to degrease the threads before applying threadlock (Loctite advises their Loctite 7063).

The same bolt type is used to fix McPherson to the body. That's why many people are surprised when they get new strut mount without tapped threads.

posted by 80.50.141...
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. Support Saabnet.com - Become a Member - 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)





The content on this site may not be republished without permission. Copyright © 1988-2021 - 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: 3.236.13.53 - 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!