Timing belt idler

[quk at isham-research.freeserve.co.uk]

> The timing belt idler is commonly referred to as the timing
> belt tensioner.

It shouldn't be.  The belt is tensioned by the water pump - the
roller (Umlenkrolle in the original German) merely serves to
make the belt engage more teeth on the crank and cam.

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 Phil Payne, Isham Research
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