Please bear- Last timing chain !

[John1]

87 560s el 225000 miles, noisy knock om rt side valve train.

Tryed to turn motor by hand after plugs were out but sometimes it would bind. Don't "see' any bent valves (from top side) compression was about 150 on all eight

My conclusion:

Not jumped as timing marks ( both cams) line up with 6-7 dgrees after tdc on crank.

Possibly the lower rail has been destroyed and has become caught in the chain when it binds/locks up.

Should I pull the entire cover or go ahead with the new replacement chain. Also an going to repalce all the rails and tensioner. Which do you replace frist
the rails or the caih!

The chain on the top side passenger side has about 1-1.5 "slack" inche which can be raised very loosely


Any help or ideas appreciated!

Thanks
John