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Thread Killer
2007 Gordon Waterman 70hp Yamaha Tiller
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Have you tried gently tapping the screw with an old screwdriver and hammer, sometimes that will help loosen the screw
 

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I've had to assist with a few abused older outboards. Not mine!   :eek:

I've found a few that it appeared as if the drainscrews had never been touched, since new.
I've had to modify very large screw drivers, using a grinder and file, to modify the blade
to obtain an exact fit to the drainscrew slot, so the blade wouldn't slip. Then using an adjustable
wrench on the flats of the screwdriver shaft, just above the flare of the blade,
was able to pop the threads loose. Be careful, you don't want to shear the screw off.
 

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Discussion Starter · #7 ·
Got it! Tried the impact driver and it barely budged (but it did move it slightly). Soaked it in penetrating oil and attempted the modified flathead screwdriver and vice grips...nothing. Ground the tip of an old chisel flat and used it to tap each side of the screw in a counterclockwise direction with a hammer...voila! It came free! :cool:

Thanks for the advice guys. :)
 

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Glad you got it ! I have VW tools that I used on relief plunger screws 1/2" drive ... fork great on the foot drains ...
 
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