Turbojunker is right. Check the clearance on the valves before attempting to change the tensioner. But once its ok, set No1 at TDC. Then remove the fan and water pump, the crankshaft pulley, the rocker cover and the front cover. Taking a piece of wire, tie it around the tensioner and tensioner shoe. You can remove the chain in two ways; either by removing the master link or by taking off the camshaft gear and removing the chain whole. You can then remove the tensioner. Inspect the ladders which guide the chain before and after the camshaft gear. The ladders have a rubber coating and once this is worn the chain would start making noises. Installation is the opposite of removal.