Re: engine noise - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: engine noise
Posted by Gary G [Email] (more from Gary G) on Sun, 8 Apr 2007 18:00:08
In Reply to: engine noise, Herb LeKuch, Sun, 8 Apr 2007 08:12:07
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Run the engine with the serp belt disengaged to check if the noise goes away. This will allow you to rule out anything driven by the belt. Only run this way for a minute or two to avoid overheating.
If the noise is not from any of the belt driven accessories the next thing to check is the timing chain tensoner. If you have 15mm or more slack in the tensioner, the chain is due for replacement. It could also be the counter balance chain. This happened to my 1997 S and I had to remove the balance chain because of a broken guide. I didn't know it broke until I dropped the oil pan and examined things. My problem started the same way. Noise only when cold and then it grew progressively worse.
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