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Originally Posted by Hatterasguy
The limit on a 603 is 4 degrees, and mine is right at that. I have no idea what the limit for a 617 is.
Timing chains on these engines will stretch and mess up your timing long before they break. Can you run one of these for a long time with a lot of stretch in the chain? Sure but the engine will not be running as well as it could.
Considering that for a 603 a chain is like $180 and real simple to change I am not going to waste my time trying to nurse it. If MB specs the timing at 15 degrees thats what I want my engine at.
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Remember, chain stretch doesn't just change your timing, it damages the sprockets that the chain rides on, which will in turn damage new chains in the future. Changing your chain before the limit is important, unless you want to be replacing cam sprockets too.
peace,
sam