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Method of eliminating porosity defects within aluminum cylinder blocks having cast-in-place metallurgically bonded cylinder liners

Image Number 2 for United States Patent #5179994.

A method for eliminating porosity defects in aluminum cylinder blocks (22) having cast-in-place metallurgically bonded cylinder liners (12) includes coating the liners (12) with a low melting point molten metal such as zinc and thereafter removing a virtually entire outer layer of pure Zn, which would otherwise melt during casting and invade the block metal, leaving behind shrinkage defects in the resultant cylinder block (22).

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