Metal gasket
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United States of America Patent
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Nov 6, 1990
Grant Date -
N/A
app pub date -
Nov 22, 1988
filing date -
Nov 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A metal gasket for an internal combustion engine has cylinder openings and a cooling water openings and is coated on its outer surface with a surface treatment agent. The surface treatment agent in a region of the metal gasket surrounding the cooling water openings has been removed. A method of producing a metal gasket having at least a cooling water opening comprises steps of coating a surface treatment agent on an outer surface of the metal gasket, covering by a masking jig the outer surface of the metal gasket except a region surrounding the cooling water opening, and removing the surface treatment agent in the region by jetting superhigh pressure water at the region.
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