As in the title, my timing belt jumped a couple teeth on my z6 and I bent 2 valves on the 3rd cylinder. I just got done replacing them and I put the head back together and reassembled the motor.

first question, I've always had trouble getting my timing belt perfectly tight, is there any tricks that anyone knows to make this easy?

second, after full assembly and trying to attempt to tighten the timing belt properly, I was trying to rotate the motor counter clockwise, using the crank pulley bolt of course, and it seemed to be tougher than usual to rotate. I couldn't find any torque specs on my haynes guide for the rocker arm assembly cap(not the 4 10mm bolts but the cap with the 10 12mm bolts) so I just made them tight, Could this be too tight and cause my motor to not rotate by hand easily? or could it be something else? mal lubrication in the head?... I know for a fact the block rotates easily as I did to clean the piston tops.

third, I was going to do a valve adjustment today but it got too late, I know that during the process only the valves that you are on, i.e. tdc is 1st cylinder then 3rd then as to firing order etc. that is the only set of rockers that is supposed to be lose, which is why you are adjusting them. I noticed that ALL of the rockers were pretty lose at TDC. Could this be caused by a major problem? or just that the valves haven't been adjusted in a LONG time?

thanks in advance HT
John.