Take it off and clean the area with wire brush, chisel, etc. but don't use abrasives (grinding wheel, flap wheel, etc.) Preheat the part and weld/peen a bit at a time, keep the preheat going. When finished do the preheat again,peen weld and surrounding material, then cover the entire manifold with dry sand (immediately) give it several days to 'chill-out' and you'll have a good repair. Get a box or pan big enough to hold the manifold and the sand ready ahead of time! I've fixed cracked heads like this using an arc welder and high nickel rod. Preheating was done with an insulated cover equipped with cal-rod elements over the the head (the preheat and cool-down MUST be uniform! A rosebud can be used but remember - the piece must be uniformly heated and cooled which is why sand is so good for the cool-down). 8)
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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