Abstract: In prior art engine breather systems, shut off valves that prevent oil from entering the engine induction system have been mounted externally on the engine and require associated external pipework. Both the shut off valve and pipework are prone to damage and leaking. The closed circuit breather apparatus of the present invention includes a cylinder head cover and a shut off valve provided beneath the cylinder head cover. The shut off valve includes an aperture in communication with a blow-by gas inlet passage and a valve float restrained to move between a first position in which the aperture is open and a second position in which the aperture is closed. Preferably the shut off valve is integral with the cylinder head cover. The shut off valve is thus packaged inside the engine valve chamber, making it easy to fit and eliminating leak paths.

Abstract: In prior art engine breather systems, shut off valves that prevent oil from entering the engine induction system have been mounted externally on the engine and require associated external pipework. Both the shut off valve and pipework are prone to damage and leaking. The closed circuit breather apparatus of the present invention includes a cylinder head cover and a shut off valve provided beneath the cylinder head cover. The shut off valve includes an aperture in communication with a blow-by gas inlet passage and a valve float restrained to move between a first position in which the aperture is open and a second position in which the aperture is closed. Preferably the shut off valve is integral with the cylinder head cover. The shut off valve is thus packaged inside the engine valve chamber, making it easy to fit and eliminating leak paths.

Abstract: An assembly of auxiliary apparatus for an internal combustion engine includes a coolant pump, an oil cooler device, and an oil filter unit combined and interconnected as a unitary unit for mounting on the internal combustion engine. The oil cooler device includes a housing having an oil pathway and a coolant pathway formed therein. The pathways are arranged to allow heat exchange between oil and coolant flowing through the pathways. The housing has a mounting surface for attachment to the internal combustion engine such that the oil pathway and the coolant pathway both extend beyond the mounting surface and into a recess of a wall of the engine. The assembly allows the engine envelope size to be reduced.