Pete - As suggested, I first will try to grind / bend a 10 mm wrench to get back in there to try to tighten things up and hopefully I wont have to go to plan B ( Dave's subsequent post ) to stop the rattling behind the harmonic balancer .

Dave - that post of yours on the crank seal stuff is great ( http://www.peachparts.com/shopforum/showthread.php?t=135541&highlight=front+crank+seal+dave ) . It looks a little more complicated than I thought but manageable . Can you decribe what how special tool works so I can improvise . Do I also need a puller .

Thanks