Have to remove rocker cover on both s62 and s54
Well technicaly you can leave the chain in situ on the s54,but the cam bolts and chain guides are known weak points, so always do them at same time! S62 chain can stay in place, beisan systems sell all the parts in us, or hack engineering are there uk distributer, i always order off hack, sound guys and quick delivery, beisan have a very good diy on there website, youl need the correct time tools aswell!