and if using nickle cast rods the block would have be cooled gradually back to room temperature
Ayuh,.... Did that once on a sailboat diesel motor riser, cracked, 'n rotted,....
Change the regulator on my gas grill to an adjustable hi-pressure style, 'n fired it up,....
Baked the piece til Good, 'n Hot, then started openin' the grill hood, 'n layin' in a 1/4" at a time, closed the hood, 'n go back in 10 minutes or so,....
Towards the end, I preheated my kitchen oven to 500?,.....
Once I was done stitchin' up the piece, I moved it to the kitchen oven, 'n lowered the temp 50? every 1/2 hour or so,.....
It Worked,... it lasted quite a few seasons, til the boat was sold,........
I've read where there is an official method of drilling, tapping and inserting threaded pieces and doing it again and again overlapping each one down the crack. It's supposed to work but I've never tried it.
That works Great on heavier castin's,.... Not so much the thin water jackets on motors of the last 70 years or so,....
This last winter, I repaired a edge flange of a door for an ole Round Oak potbelly stove,....
Thin stuff,...
The missin' area, maybe 5" , 6" long, by up to an inch wide, had rotted/ rusted away, from bein' buried in dirt for God knows how long,....
I clamped a hunk of aluminum, bent just so, to it to support the new weld, 'n started tackin' it together,....
One drop of 99% nickle rod at a time,...
Many hours, or days in-between drops of weldment,....
Draw an arc, see the droplet, pull away,... go do something else,....
Also welded a top to bottom crack in the lower fire ring castin',....
The door looked pretty good, the fire ring not so much, but well connected, needed a slather of furnace cement when the stove was assembled, 'n pointed,...
Aluminum blocks is another matter that I have no knowledge or experience with.
Ayuh,.... Much easier,....
I've done Harley blocks, 'n heads for a few motors,....
