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Re: Timing Chain Posted by Ari [Email] ![]() ![]() In Reply to: Timing Chain, AE, Mon, 7 Jan 2002 18:24:56 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Increased noise from the chain area at idle can be a sign of a tied chain. At 211K miles, that wouldn't be a surprise. But other things can make noise, like worn chain guides, lazy hydraulic lifters, even a worn fuel damper.
The way to tell is to remove the valve cover and inspect the chain. You can turn the engine over to TDC for cylinder #1 and check the alignment marks on the cams and head. If they're off a little, then the chain is worn.
Try some other things first. Do an oil change - new oil can quiet lifters some. Turn the engine backwards by hand a turn or two to set the chain tensioner. If it's the original chain tensioner, replace it. There was an upgraded design around '88. For $50, it's worth it.
There are two approaches to replacing a timing chain. The 'easy' way is to roll it in. See some notes on timing chains below. You can replace just the chain with just the valve cover off. However, if the chain is that worn, chances are the chain guides are worn too, and those don't replace as easily. You need to remove the timing chain cover, and that is a major effort. It's possible to do it with the engine in the car, but not easy.
I would inspect the chain and go from there. Not all noises are timing chain.
As to the downside, the Saab engine is an interference engine - break the chain, and the pistons and valves will meet with gusto, and there'll be significant damage.
posted by 12.79.5...
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