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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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