The gasket between the block and the reed/inlet 'head' on my 1991 Mariner 30 2 stroke started to 'chuff', puffing white smoke out of the gasket. One of the M6 bolts goes into a casted boss that has a stripped thread. I am hoping for some advice / options....
The boss is at the bottom of the block and highlighted in the arrow below; the bolt threads in from right to left in the photo.
The threaded hole continues through the boss and comes out right against the main part of the casting, i.e., I couldn't get a nut or bolt-head in there.
To helicoil it would mean drilling it out by another 3mm or so, leaving only about 3mm of material round the threaded hole. This seems a bit too little to me.
I could drill it out to 6mm and grind the head from a bolt so that it would slide in from left to right, then have a nut holding things together.
On the plus, side, the engine does seem nice and clean inside...
All suggestions gratefully received!