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Having this tool makes life much much much easier
With this, you can use a four foot long pole to undo and torque the 24mm headed crankshaft pulley bolt; the torque setting for which is 60Nm plus 60°
Use a drill bit the same size as the hole in the cam belt tensioner pulley bracket to keep the spring tensioned so that you can get the belt off and on
As the previous member mentioned, do change all the front seals at once; doing so guarantees no future leaks for which you would need to do this job all over again