190E 2.5-16v timing chain tensioner install

[Joreto]

I have a problem installing the timing chain tensioner after I installed the new timing chain. When I screwed the tensioner to the block it broke the new timing chain guide rail (the aluminium part) in two . I got a new guide rail which I installed but I'm afraid that if I screw the tensioner into the block all the way (if I don't oil leaks out) it will break the guide rail also. The tensioner is ok, when I press it at the front it retracts. I also unscrewed the hex bolt and took the spring out but even screwed like this (for a test) it looks like the tension on the guide rail is very high (with the front of the tensioner retracted all the way). What am I doing wrong ? What is the correct procedure for intalling the tensioner ?

thanks,
George


P.S. the new timing chain is exactly the same as the old one, there is no difference.