Or do it like this (I think Sando suggested this a while back). Belt length is 915mm. Loosen alternator and shift it so that you can get a little bit of slack. Fit the belt around the crank and alternator and then use a spanner on the alternator to spin it to give some slack on the belt, enough to gradually get it over the water pump pulley. Pull the alternator back into place, and don't bother with a tensioner......

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