Abstract: A diagnosis control valve unit, provided in a vent pipe extending from a carbon canister, includes an air cleaner casing, an air cleaner filter and a diagnosis control valve substantially contained in the casing. A valve element, a valve seat and valve driving components of the diagnosis control valve are disposed in an internal space of the casing and the filter. The diagnosis control valve is firmly attached to an end of the casing. A valve element and a valve seat of a check valve are optionally provided in the casing, firmly attached to the opposite end of the casing. A vent pipe may be connected to that opposite end of the casing, in place of the check valve. The diagnosis control valve, check valve, or vent may be detachably connected to the casing.

Abstract: An exhaust manifold for a multicylinder type internal combustion engine has a connector is employed for connecting downstream ends of gas conduits to upstream ends of a forked exhaust pipe. The connector is of a monolithic casting and comprises a base plate portion having openings respectively connected to the upstream ends of the forked exhaust pipe, two collar portions intergrally formed on the base plate portion and having respective bores merged with the openings of the base plate portion respectively. The downstream ends of the gas conduits are sealingly received in the collar portions. A sensor mount is integrally formed on the connector for mounting a gas sensor. The sensor mount has a bore which is exposed to the interior of both the two collar portions.