Thanks Mike, that was it. I learned it hard way, I tried to take off the rocker arms as Steve suggested, but did not have the MB valve spring compressor tool. Then I pushed the Tensioner rail all the way in and that freed up enough slack to connect the chain. I double check the timing marks and they all aligned up perfect with ~1 degree stretch.
yes I have changed all the chain rails with the new tensioner, 2 of my chain rails was broken and chain was touching the pivot pins and timing case. I believe I was very lucky that the chain did not slip, but now I am thinking to take off the oil pan to find the broken pieces since i only found half a rail at the botton of timing chain cover. The chain rails seems to have broken long time ago, but I started to hear the morning chain rattle for couple of days ago.

Thanks again

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87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)