Re: lets talk about pistons - Saab 9-5 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 |
[Main 95 Bulletin Board | Post Followup | BBFAQ ]
[ Prev by Date ] [ Next by Date ] Member Login / Signup [Latest Member Gallery Photos]
Re: lets talk about pistons
Posted by siwyjohn (more from siwyjohn) on Tue, 15 Sep 2020 22:55:23
In Reply to: Re: lets talk about pistons, bobc [Profile/Gallery]
, Tue, 15 Sep 2020 21:22:35
Ad 1. Maybe don't try luck in ProParts lottery and simply buy rings from well known manufacturer like Mahle/Goetze? Price will be very similar or even lower.
Ad 2. There is no particular order, however standard size (90mm) pistons are manufactured in a few tolerances marked with letters on the top (AB, B) to fit the cylinder bore with certain clearance. There are two oversize versions (+0.5mm, +1.0mm) as well.
Ad. 3. You can leave gudgeon pins if the are undamaged, just gently polish them using polishing paste like "Mothers".
Ad 4. Rings are fragile. It's possible to install them with bare hands, but there are special tools for it also. Remember to check very carefully how the should be oriented (chamfers, angle positions). Before installation you have to check the clearance by putting the rings into cylinders and measuring the gap. If the gap is too low it could be increased by grinding ring ends.
Remember to hone the cylinder walls before pistons installation - it will enable rings to sit properly.
The best way for successful engine assembly is the measure all the parts and calculate clearances - it ensured that it will work together.
PS. For cleaning pistons manually you can try to use synthetic engine oil and a brass wire brush - it usually works very well. Shops usually use ultrasonic cleaning bath, which is quite affordable in this size and is a good investment for the future DIY jobs. Grinding pistons is not a good idea - if you already did it, then you can polish them to remove scratches.
posted by 80.50.141...
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: 18.104.22.168 - 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!