Engine for outboard engine system

Internal-combustion engines – Frame construction – Horizontal cylinder

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440DIG900, F02F 700

Patent

active

060951087

ABSTRACT:
A cylinder block is coupled to a cylinder block/cylinder head coupling surface of a cylinder head by ten bolts which are disposed to surround outer peripheries of combustion chambers. In order to enhance sealability of an opening of a cooling water passage defined radially outside the bolts as viewed from the combustion chambers, the cylinder block and the cylinder head are further fastened to each other by a bolt disposed in the vicinity of the opening. Thus, the fastening force of the cylinder block/cylinder head coupling surface can be increased to increase the degree of freedom in design of the opening of the cooling water passage defined in the coupling surface.

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