You need a tensioner - unless you have been driving your car REALLY hard, the timing chain should last the life if your cylinder walls and piston rings. It takes a LOT of torque or a lot of outright abuse to stretch a timing chain. I would have the chain tensioner checked.
+ 1 to the AKS post.
chains, in theory, aren't replaced. Belts are...
that rattling you're hearing could be a number of things. Do you have a manual tranny? Could be clutch plate thingy-majigger. Try depressing the clutch all the way and see if the rattle disappears.
If its auto, then could be something exhaust related. These cars rattle non-stop :roll:
In the ng900 (and I suspect SS's, given the similarity of the motor) you could check the chain health by taking the chain tensioner out and seeing how far it had ratcheted out. I'm sure the WIS will give a spec, can any WIS owners confirm this?
Mostly, I agree with the others who note that the chain should be OK for well over 100K, and most of us will never have a need to replace one. However the ng900 folks do have failures and it's worth ruling out. To read more, search on "rattle of death" in the ng900 forum.
"Both" engines? There are more than 2 over here :cheesy:
To clarify, the petrol (gasoline) engines use a timing chain. As suggested above, I'd get them to check the top tensioner as it may require adjustment. Chains normally give plenty of warning that they are failing, unlike timing belts (though this is not always the case - VW VR6 engine for example). As Cosmic says, there is no fixed change intervals for timing chains, and in fact they can last the lifetime of the car without trouble.
Although the OP was asking about the 2.0T, for info, the diesel engines do have a timing belt and not a chain, and the change interval is every 60K miles I believe.
I had some noise as well, ended up being the tensioner not "fully engaging" which was causing chain to bang against the guards, thus damaging them. Luckily still under warranty (CPO) so all was covered, and even changed the belt while they were in there, for the cost of the belt only.
OK, well I agree that it's definitely worth checking out. It could be something minor, maybe an accessory or shield that rattles when cold. Check on the ng900 forums, perhaps someone has posted an audio file with chain rattle. Because their cars are older, they're more likely to have experience with this. The motors are reasonably similar.
but I came across this and I have a similar issue (hindrance more so.)
I recently purchased a 2004 Saab 93 2.0t Linear @ 58k miles... and it has the same 'rough idle' almost diesel sounding noise that 'rg627' mentioned. It doesn't sound like a diesel truck outside of the car, but inside it has a very distinct diesel idle sound.
Any idea on what it could be?
Thank You and sorry for bringing up such an old post.
It is more than likley the tensioner is seized quite common,it can come apart and be cleanned, but you must be careful your timming dosn't jump.
It's the big nut 1 1/8 on passenger side of engine at rear.
The 2.0T/t 93SS has two Internal timing chains designed to last the life of the engine..... the Serpentine Belt should be changed every 60K and the tensioner adjusted or replaced.
Hi, This may be an old post but new to me, I'm trying to determine if my
93 Vector 1.8t cabriolet 07 plate with 40,000 miles has a timing belt or chain
If belt can anyone advise the replacement period, is it 7 or 10 years
Therefore they do not need replacing at scheduled mileages.
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