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All timing on engines is always done on Number 1 cylinder. On an inline engine it is the very front cylinder nearest to the radiator. On a transverse engine it is the cylinder nearest to the belt drive pulleys.
Remove the upper radiator shroud. Remove the fan by undoing the 4 bolts that hold it to the water pump. Using a wrench turn the tensioner pulley hex nut to release tension on the belt. Remove the belt and replace with a new one. Refer to diagram for routing detail. http://www.fixya.com/support/r5914885-isuzu_serpentine_belt_routing_diagram
timimg marks for camshafts are notched in the top of the cylinder head. they shuld line up directly in the middle of the 2 smaller cam gears behind the new belt should come with lines on it to make it easier crank to be lined up with keyway slot to the right again the belt should have a ditted line on it for that remember remove the tensioner pushrod assembly and put it in the vice to depress it line the holes up in the body of it and put a 1/4 in allen key through it when you refit remove the key turn it over twice all good