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Date: Sat, 23 Jun 2001 14:50:14 +0100
From: Johannes H Andersen <johsnopsamsafish.com>
Subject: Re: Timing chain


SimonJ wrote: > > > Questions: > > 1.Anyone with experience with a broken timing chain in a > > Saab engine. At what mileage? If so, is it a destructive > > event to valves etc? > It is not uncommon on 16 valve engines, and extremely destructive > > > 2.Has anyone replaced a timing chain as a "preventative" > > measure? At what mileage > Yes, at 107,000, chain, sprockets and tensioners were all showing signs of > wear. > > > 3.What are the signs/symptoms that indicate the timing chain > > should be replaced. > Noise > > > 4.Anything in the line of advice. > It would seem from what you say, that your tech is thinking of 'rolling in' > a split-link type of chain. If this is the case, make sure he has the proper > tools to install the split link, the link pin has to be compresed to expand > it into the link. Also if fitting by that method, you cannot replace > tensioners, guides, sprockets etc, which IMO are best changed at the same > time as doing the chain, mine were all showing signs of wear. > I would get him to quote you for changing all parts, they are not > particularly expensive, and it is pretty easy to pull the engine on a 900. > The +$1000 was probably acounting for repairs to the valves etc. Agreed, there is no point in changing the chain without changing the other bits you mentioned. Although this is unrealistic IMO, I think he was after an answer to the question: What happens if you carry on? Will the chain eventually break? And what if it breaks? Johannes

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