Seal structure between cylinder head and head cover in engine

A seal structure between a cylinder head and a head cover in an engine, said cylinder head having a valve-operating cam chamber defined therein, rocker arms being vertically swingably supported on the cylinder head in said valve-operating cam chamber, said seal structure comprising:

• a seal member interposed between said cylinder head and said head cover, said cylinder head having a slanting face portion at least at an intermediate portion of an upper end face of the cylinder head to which face said valve-operating cam chamber opens, said head cover being coupled to the upper end face of said cylinder head by bolts to close said valve-operating cam chamber,
• wherein the upper end face of said cylinder head comprises a pair of flat face portions parallel to each other at different height levels,
• wherein said slanting face portion connects said flat face portions to each other and is declined toward positions when said rocker arms are vertically swingably support on the cylinder head,
• wherein said head cover has a fit wall portion formed thereon and fitted to an inner peripheral surface of said valve-operating cam chamber, and said seal member is mounted in a seal groove provided in an outer peripheral surface of said fit wall portion to come into close contact with an inner peripheral surface of said cylinder head, and
• wherein said head cover is formed with a flange portion abutting against said upper end face, said flange portion being coupled to said cylinder head at locations corresponding to said flat face portions by said bolts.