as described merc 70 3 cyl knocking after hitting concrete mooring 3/4 throttle,bent stainless prop ear in half.took apart lower end and shaft straight.knocking only at 1/2 to 3/4 throttle.im mechanic by trade so can take it apart easily.any help as where to start looking would be appreciated.measured the stroke of the 3 cylinders 2 came up short 30 thousands compared to the others.
g.w.fitzgerald@worldnet.att.net