viggen timing chain tensioner all the way out! - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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viggen timing chain tensioner all the way out!
Posted by Ed N [Email] (more from Ed N) on Mon, 20 Apr 2015 06:42:50
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2000 Viggen, 146,000 miles. Rattling noise from timing chain area under moderate load, otherwise quiet. I pulled the timing chain tensioner (first remove 12mm bolt and interior spring). The tensioner was almost all the way out, just one click left on the rod. This is about 18mm, well beyond the 11mm specification for maximum operation.
Fortunately the engine runs fine (although valve timing must be interesting), so I expect little interior damage except maybe to guides & possibly sprockets.
Time to pull motor out and take care of things. Its just amazing that a timing chain is needed after only 146K miles. The 9000's and C900s I've had in the past never needed timing chains well towards 300K miles.
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