I'm in the process of replacing my guide rails and tensioner in my 560sl (117.967 engine) per Thomaspins' detailed instructions on his website. However, I'm having some intial problems. The main area of confusion is in the measuring of the chain stretch. I removed the passenger side valve cover and rotated the crankshaft until the camshaft and tower marks aligned, but when I looked on the balancer marks I was nearest to a mark that looked like this 18|0. I expected to be looking at marks that look like this 3|0 2|0 1|0 O 1|0 2|0 3|0.

What am I missing?

Thanks!