That machineable epoxy stuff might work, it's really tough. I would just be worried about how long it will hold up to heat, vibration, oil, Diesel.... whatever else might be around. You can bet that it would fail at the worst possible time! 
Even if you did take everything out to weld it the case would likely warp from the heat and be unusable.
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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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