METHOD FOR SEALING ROCKER COVER

A sealing method wherein sealing agent composition comprises: (A) organopolysiloxane having at least two silicon atom bonded alkenyl groups in one molecule; (B) organohydrogen polysiloxane having at least two silicon atom bonded hydrogen atoms in one molecule; (C) fumed silica of a specified amount with respect to the components (A) and (B); and (D) an inorganic filler of a specified amount with respect to the components (A) and (B), in which the rocker and the cylinder block are pressed such that a hardness of the sealing agent in a cured state is 60 to 80 with a type A durometer of JIS K 6253 and a compression rate of the sealing agent becomes 20 to 40%.