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Originally Posted by basa
It is certainly NOT the cambelt squealing !! If that slips (it's toothed btw) you would know as there would be a big bang (as the pistons hit the valves !!) and the engine would stop instantly !!
The noise is almost certainly your alternator drive belt. Some older cars used to squeal if the distributor points cam got dry - but most modern cars use electronic ignition with no contactor points.
You have to slightly slacken the two alternator mounting bolts (slacken these only about half a turn - enough so the alternator can actually rotate slighly not loose so you can turn them by hand) and then loosen the bolt in the elongated slot that allows the alternator to move forward to tighten the belt. I use a large screwdriver to lever the alternator body against the belt tension and hold it tight whilst retightening the adjuster bolt. You can then re tightnen the mounting bolts.
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not necessarily a big bang , some engines dont lunch themselves when the belt goes , why they all dont is beyond me
