PROTECTIVE MASKING DEVICE TO BE PUT ON ENGINE BLOCK DURING THERMALLY COATING CYLINDER BORES PROVIDED THEREIN, AND METHOD USING THE PROTECTIVE MASKING DEVICE

摘要

PURPOSE: Provided is a protective masking device adapted to rest on the upper surface of an engine block having cylinder bores during a thermal coating operation of the cylinder bores which is suitable for multiple use and easy to apply and which makes possible an activation of the thermal coating apparatus outside of the cylinder bore to be coated. CONSTITUTION: A protective masking device(4) includes a protective masking member having an essentially hollow cylindrical shape with an inner diameter selected in relation to the diameter of the cylinder bore(2) to be thermally coated. And the protective masking member includes an essentially tube shaped outer sleeve and an insert member(6) inserted into the outer sleeve. The insert member(6) is loosely inserted into the outer sleeve to be vertically movable with regard to the outer sleeve. The insert member is provided with a stop member adapted to prevent the insert member from falling out of the outer sleeve.