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Skimming an outboard

J

Johannes

New member
Hi guys,

I am in the process of rebuilding a 55hp Yamaha 2 cylinder from the late '70s in South Africa. During the stripping process one of the bolts holding the head onto the engine sheared off and was stuck in its hole in the cylinder block. In trying to remove this broken stub I had to use all kinds of tricks and I eventually ended up damaging the surface where the gasket sits. The bolt is still stuck in there but I have decided that I will have it removed at an engineering workshop. There is a gouge in the sealing surface of about 1mm deep so I stuffed it up pretty good. The damage is only about halfway through the width of the sealing face so I don't think it is going to leak but I'm not 100% comfortable with leaviing it like that. The gouge is on the outer sealing face, in other words the seal between the cooling water and the atmosphere.

Does anybody know if I will be able to skim the block 1mm deep to remove the gouge? Alternatively, can I have this spot built up with some sort of welding method and then have it skimmed only a couple of microns to give me a good surfave finish again?

Thanks!
 
Since no one else has answered, I'll jump in with some generalities, having not specifically been there or done that (yet). 1mm seems a lot to take off a block. It would make a real change in deck height. Yamaha should have a spec range for what's acceptable. Get that information before doing it. Also, the gouge might not be as deep as it looks. Metal often gets pushed up around the edges. Check it with a good straight edge. The shop that does the stud will likely have suggestions on repairing the surface.
 
No need, clean with acetone, and apply block weld or JB weld (epoxy with aluminum powder mixed with it. sand down smoothly after a day to harden and it will be fine,
 
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