Hope these pics work. Looking again, perhaps if i could find the long bolt that bolts the 2 halves together at the rear might do the trick as the crack is not right through the case. of course the bolt is NLA
id be tempted to try redkote or somethin like that on em first. bolts/screws shouldn't be too hard to find or make. if ya got measurements, I got parts saws I can rob.
be a bit of a job doin that [weldin] properly.
Digging into this saw further, I'm amazed at the amount of saw cake that was Under the oil pump cover. Have to wonder about the design. I don't think the oil leak was from the crack as it's on the fuel side of the case. Bolt looks to be about 2 to 2 1/2 inches and I would guess the same size as the other bolts that hold the case together. So with the bolt and a new decomp or plug I might be nearly good to go. Wow how do you get the carb rods, throttle and choke, off easily? I ended up taking the handle apart.
Thanks for your help
There's a good chance it's a 10-24 bolt. It looks like a blind hole. Maybe the PO put a bolt too long in there and cracked the case. You should be able to find a 10-24 bolt that length or longer and cut it down. The thread count and bolt size should be the same as the other case bolts.
Stick a wire or a smaller drill bit in the hole and get a proper measurement
I've got one of them with the shafts swapped over in my Mac Super 44A and another one coming for the 790 I picked up recently. They need the 'low profile' fuel pump/filter/inlet section on the bottom of the carb in order to fit the air box on a lot of saws fyi.