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I've repaired quite a bit of crankcase damage over the years. Most of it is fairly minor, cracked out screw holes and things like that. However, some damage is more severe.
Three examples are shown below.
The aluminum used in Harley castings is notoriously porous. It must be absolutely clean. When the arc and heat of a TIG welder hits a case, the welder can actually see oil boiling out of the pores of the metal. Except for very rare instances for small welds the cases must be disassembled to repair them. The cases must be bolted together and heated to prevent warping, large amounts of localized heat will expand the metal in the weld zone..."
As you can see a shit job was attempted and now must be cleaned up.the case itself was not damaged, just the lugs. I am trying to bring this back from the dead.
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