February 7, 2011, 5:19 pm
[quote name='taffg' timestamp='1297027504' post='112935']
sorry again eddie but i will now try to paint a picture in less than 1000 words. you have the haynes manual and if you look at the aux drive belt routing diagram it basically shows you where the tensioner is, just below the power steering pump pulley. Its really hard to see, however if you lift off the cooling expansion tank without draining and carefully shift it out of the way you may see it better. the haynes is pretty good at detailing the procedure.
the tensioner is held on by three mounting bolts, but in the centre of the sprocket you will find a bolt head, fit a socket to it and rotate clockwise and you will feel it move, releasing the tension on the belt. beware its a chunky spring inside so dont slip off as you will get knuckle rash
once you have removed the belt spin the pulley on the tensioner, and also check the idler pulley if you hear any noise then replace them as when under load they will sound even worse. you can also check the alternator but i do hope its not this as theyre probably pricey. i managed to get an after market tensioner for about half the price of the dealers, however i couldnt source an idler pulley so had to get from dealer. i had exactly the same prob as you on my petrol mk 1 and it was these items at fault. access is very lmited so remove the right hand engine mount after you have supported the engine as per manual. it takes about a couple of hours to do. good luck and no i'm not counting the word count
ps ensure you correctly route the aux belt on rebuild!!
Many thanks buddy, that all makes perfect sense. I will let you knw how I get on later in the week. Its too dark and too cold, I am too old and my wife moans too much. So I will wait until weekend to do it through the day when its light, warmer, and the wife goes out!!