Acceptable OMC Cobra 86 prop shaft run-out???

Question

I have read that .003" is max run-out. BUT where to measure at? I know my prop shaft is bent - but if I measure 1" up from the thrust face for the prop - its at .0015 - if I measure at the end its .150+. There is vibration at low RPM, but smooths out at plane. I realize this requires attention, but there is only a month left of boating. Can I wait to repair over the winter (maybe 5 more Saturdays of fishing) or does it require immediate attention. OR is it OK and not to worry at all? No evidence of seal wear (water in oil).

Answer 1

The lower unit has to be rebuilt and the shaft changed> But running it will cause more damage to the gears & water intrusion> it is also causing the out drive to vibrate which will cause more damage> It's like driving your car with a bent rim but worse> Your call> I wouldn't>  

Answer 2

Don't worry about it,  If it smooths out it's not bent enough to cause failure.  The shaft can be straightened by a good machine shop.  Good luck!