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Re: bad chains? Posted by Ari [Email] ![]() ![]() In Reply to: bad chains?, Bry M., Wed, 23 May 2001 10:15:20 Members do not see ads below this line. - Help Keep This Site Online - Signup |
A badly worn timing chain will make noise -usually a rumbly noise directly related to engine speed. A badly worn chain will also alter valve timing some, so in addition to being noisier, the performance will be off some.
It is normal for a Saab engine to be a little rattly near the top of the engine. This can be caused by a bunch of things, including noisy hydrualic lifters, a worn fuel pressure damper, and just the noise of clacking fuel injectors.
If you are concerned about the condition of the timing chain, simple remove the valve cover and inspect the chain and cam sprockets for wear. Turn the engine so cylinder #1 is at TDC, and check the alignment marks on the cam against those on the head. If they line up well, the chain is OK. If they're off, the chain is worn, and if the marks are way off, may have even jumped a tooth.
Replace the valve cover with a fresh gasket. Seeing as most valve cover gaskets begin leaking after a few years, chances are you need a new one anyway. It takes me about an hour for the task, and most of that is spent getting bits of the old valve cover gasket off the valve cover.
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