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Actually for a quickie belt replacement you can tension them by hand. Most will over tension the belts. They are left a bit loose to allow for engine expansion. The smooth rollers next to the belts are there to keep them from slapping about.
On the 83 you want to slacken the tension side of the timing belt by reverse rotation then checking if the belt can be pushed into itself at the water pump. Should almost touch with a firm hand.
Missing teeth on timing belts are usually from a loose belt and this passing/pinch point. Newer water pumps come with a metal barrior to keep the belt from hitting itself.
The balance shaft belt is left a bit loose too. More than what you would think. A too tight balance belt will whine. Some of the balance belts come with grooves in the top of the teeth to bleed off trapped air.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Never break more than you fix!
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