Abstract: A sixty degree, V-6 engine for an outboard motor includes loop scavenging and charging with a pair of oppositely located input passageways with differently angles sidewalls and which provide progressive, smooth constriction to the charging port to establish a highly effective velocity pattern across the top of a flat piston. Cast "Blister" cylinder liners with integral ports are integrally cast into an aluminum block. The block is cast with a single manifold between the two cylinder blanks. A milling cutter is located within the manifold to open the exhaust passageways. A T-shaped manifold is secured to close the manifold and define a pair of separate exhaust passageways. The cylinders are rotated to align the upper and lower inlet ports and particularly to locate the exhaust port projecting downwardly into a center manifold. Adjacent piston rods are mounted upon a common crankshaft pin.

Abstract: An internal combustion engine for an outboard motor includes a cooling passageway extended upwardly through the central core and discharged into a chamber in an exhaust manifold covver between the cylinder banks. The water passes through the cover and to the lateral side edges which have inlets to cooling chambers about the opposite cylinder banks which are continuous and discharge at the uppermost end. The cylinder heads have a cooling chamber with top inlet aligned with the cylinder discharge. The cooling water flows downwardly over to a common discharge header at the lower end for both of the cylinder banks. A pressure relief valve discharges the water from the common header. A separate thermostatic valve is secured to the uppermost end of each of the cylinder banks at the transfer connection from the cylinder cooling chamber to the head cooling chamber and thus at the uppermost and highest point in the two banks. A lower supply chamber is coupled to a pump having a small by-pass opening.

Abstract: A V-engine includes angularly oriented cylinder banks with an outer enclosing rectangular cooling jacket wall and outwardly opening cylinders closed by an outer cylinder head. Bolt attaching lugs are integrally formed on the exterior of the cylinder walls within the cooling chamber and are spaced from the jacket wall to maintain a continuous cooling passageway. The head is bolted to the cylinder block at such lugs. The inner and outer vertical edges of the head are beveled with the outer edge reducing the overall width and inner edge increasing the spacing between the cylinder banks.

Abstract: A power trim and shock absorbing system for outboard motors. A pair of combined trim positioning and shock absorber cylinder units are mounted within the side arms of a transom bracket assembly of an outboard motor. A manifold within the assembly coupled the units to a supply within the boat. A hydraulic manifold is pivotally mounted and attached to the lower end of the cylinder units with hose connections directly to lower side ends of the double walled cylinders to maximize the power stroke. The hose system includes passageways formed directly in the lower mounting bolts for the transom side members to minimize fluid leakage areas and damage to the boat transom. Down trim limit cams are pivotally located within the swivel assembly on a rotating rod and cooperate with aligned motor arms to set the minimum trim down position. A trailing bar is pivotally interconnected to the motor unit between the power cylinder units. An over-center control link is coupled to the bar by a spring.