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my car has now just passed 230.000 km, and is sheduled for service mid oktober, talkled to the saab mech just this day and mentioned that the timing chain might need replacement or at least at check, so if you have a car that has done fairly high milage, when did you replace the chain, also since my car is a 2.3L there is a balance axel with chain, this might also cause a slight noise if near end of life, this chain can be removed I've been told, anyone done that? how does the engine feel like after that? more vibrations?

Cheers,

K.
 

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Balance chain deletion

Yes. Not much increase in engine noise, less chain noise and there is a small amount of additional vibration you can feel in the shift lever at idle, or very low rpm.

Exactly as predicted by other people who did this before me. Usually done for better engine performance or to save the cost of replacing the balance chain sprockets and balance chain tensioner which cost much more than the chain, both the parts and the labor.

Description of balance shaft system:

http://www.saabcentral.com/%7Emunki/technical/engine/tech_specs/balance_shafts.htm

It is not that popular on this board, but there is some info online. For example, on Kevin Yankton's web site, www.yanktontuned.net
He removes the shafts and the balance chain when the engine is out of the car and being rebuilt for performance reasons, and also blocks off the oil feed lines. See http://www.kyankton.net/saabng900/balance_shaft_removal.htm for a detailed discussion.

I had the balance chain removed from the bottom, with the engine in the car when we did the engine and rod bearings. 5k miles ago. Everything else (chain guide, tensioner, sprockets etc. was left in place, and will stay that way unless I decide to rebuild the engine.

The timing chain condition can be estimated by taking out the timing chain tensioner and measuring its extension. I posted all my notes on this board some time ago. Aso see link below for the removal, pics of the tensioner, and other details.

http://www.geocities.com/ng900set/TC_tensioner/tc_tensioner.html

Good luck.
 
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