crack in the engine

[Captain_Rum]

So in the process of tear-down of a 1960 Scott 40hp (A3HB) i noticed 2 cracks in the engine case… the larger of the two appears to be from the factory(?) since there appears to be paint in the crack. The 2nd and more concerning is the crack on the case near the piston… I would like some feedback: is this repairable with aluminum brazing? JB weld? or is the case shot and time to become an anchor?

• This topic was modified 4 years, 6 months ago by Mumbles.

[Mumbles]

I wouldn’t trust JB or anything similar. TIG welding would be the way to go.

[need2fish]

Those look like casting faults and may not go all the way through the water jacket, crank case, cylinder block.

Mumbles is right – TIG makes a strong weld without destroying everything around it. I would recommend you seek out someone who does automotive welding.

[Captain_Rum]

i ordered a scope to check if this extends into the inside of the cylinder wall (i don’t want to tear off the head). I will update with what i find out

[crosbyman]

are those 60 year old cracks..? or recent ones if they lasted 60 years without symptoms maybe best left alone …. just mho

Joining AOMCI has priviledges 🙂

[Captain_Rum]

the first one looks like it might be that old, not sure of the other…

[dave-bernard]

the on in the cyl wont go thru remember the cyl is steel liner. the crack is in the aluminum.

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