Patent ID: 6955147

Claim:
An assembly method of an engine cylinder head cover, comprising: forming a round bushing for provisionally assembling locking bolts on a cylinder head via a round bushing, which is disposed at the cylinder head cover and has a circular inner diameter for closely attaching to a shank of said locking bolts; forming a long hollow bushing for provisionally assembling said locking bolts on the cylinder head via said long hollow bushing having an oval-shaped pipe hole, which is placed at the cylinder head cover, and the inner flat edge of said oval-shaped pipe hole closely adheres to the shank of said locking bolts, wherein the length of the flat edge is longer than the shank's diameter of said locking bolts; and fastening said locking bolts at a fully-tightening torque, wherein some of said locking bolts are assembled at the cylinder head via a plurality of assembling bushings, which are placed at the cylinder head cover and have a larger diameter than that of the shank of said locking bolts, while other locking bolts are provisionally assembled at the cylinder head via said round bushing and said long hollow bushing, wherein the round bushing forming step and the long hollow bushing step are manually performed, wherein; said round bushing step is completed by provisionally assembling said locking bolts onto the cylinder head via said round bushing disposed at a central part of the cylinder head cover; and said long hollow bushing step is completed by provisionally assembling said locking bolts on the cylinder head via a long hollow bushing having an oval-shaped pipe hole at an edge of the cylinder head cover along the longitudinal direction, wherein the inner flat edge of said oval-shaped pipe hole is parallel with the longitudinal direction of the cylinder head cover.