I have a craftsman 24hp mower that all of a sudden bent the exhaust push rod on the right cylinder, no problem ordered a new one rotated the engine in the correct direction, both valves closed on the compression stroke then 1/4 in past TDC, set rockers at .005. I then hand cranked it around and it bet it again! valve doesnt appear to be sticking and everything moves as it should so put another one in and same results. So now I have the third one in and am affraid to touch it until I can maybe get an explanation so I dont have to do this a fourth time. Any Ideas???