nickd wrote:Jim, when you change a cambelt do you use a special tool of any description to set the tension, or the 'rough' method described in the Haynes manual?
On the diesels Nick, both the 1.9 and 2.1, the tensioners are automatic (i.e. spring loaded) so it is just a case of releasing the tensioner from its fully off position, rotating the engine a couple of times and then locking the tensioner in the tensioned position. No so on the 2.0 petrols. They use a manual eccentric tensioner similar to the one that tensions the auxillary belt.
I always use the 90 degree rule, that is, adjust the tensioner until the belt can just be turned through 90 degrees between finger and thumb in the middle of its longest run. You need to be aware though, that it is very easy to over tension the belt as the engine expands significantly when it is hot and thus if you adjust the belt to the tight side when it is cold, it'll be too tight when hot. If it is too tight, you'll hear it making a sort of whining noise.
I set it so that it is very easily turned through 90 degrees between finger and thumb when cold, rotate the engine a couple of revolutions, check tension again and run the engine up to temperature with the cover off and then check that the belt can just be turned 90 degrees when hot. You need to take care doing this that nothing can get trapped in the belt and sprockets and take car not to burn yourself on the hot engine. At least, unlike the diesels, you can get the cover on and off without removing the engine mount. Listen too for whining when hot in case the belt is too tight.