Re: lets talk about pistons - Saab 9-5 Bulletin Board - Saabnet.com


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Re: lets talk about pistons
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Posted by siwyjohn (more from siwyjohn) on Tue, 15 Sep 2020 22:55:23 Share Post by Email
In Reply to: Re: lets talk about pistons, bobc [Profile/Gallery] , Tue, 15 Sep 2020 21:22:35
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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.

https://saabwisonline.com/c7/9-5/2004/2-engine/basic-engine-4-cylinder-petrol/technical-data-basic-engine-4-cylinder-petrol/pistons/piston-diameter/

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.

https://saabwisonline.com/c7/9-5/2004/2-engine/basic-engine-4-cylinder-petrol/adjustment-replacement-basic-engine-4-cylinder-petrol/pistons-connecting-rod-cylinder-bores/matching-of-pistons/

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.



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