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| Number | Title | Issue Date |
| 6752673 | Cooling arrangement for outboard motor An outboard motor includes a housing unit that forms an outer wall exposed outside. An engine is disposed above the housing unit. The engine defines a water jacket. A water transfer system is arranged to introduce water from outside of the housing unit to deliver th... | 06/22/2004 |
| 5873330 | Cooling arrangement for engine A coolant system for a vertically oriented engine of an outboard motor is disclosed. Coolant flows through the coolant system from a coolant pump into a coolant jacket surrounding an exhaust manifold of the engine, down to a bottom of a cylinder head of t... | 02/23/1999 |
| 5822985 | Exhaust passage structure of outboard motor unit An exhaust passage structure is provided for an outboard motor unit having an engine holder mounted to a hull through a bracket, an engine disposed to an upper portion of the engine holder, a drive shaft housing disposed to a lower portion of the engine h... | 10/20/1998 |
| 5487687 | Midsection and cowl assembly for an outboard marine drive An outboard marine drive having a midsection between the upper power head and the lower gear case and having a removable midsection cowl assembly including first and second cowl sections. The midsection housing includes an oil sump in one embodiment and f... | 01/30/1996 |
| 5439651 | Catalyzer support system for exhaust cleaning of outboard motor A catalytic exhaust treatment system for an outboard motor wherein a catalyst bed is supported within the exhaust pipe on a support plate that permits the catalyst bed to expand and contract relative to the surrounding exhaust pipe from which it is spaced... | 08/08/1995 |
| 5433634 | Exhaust treatment for outboard motor An exhaust system for a marine propulsion outboard drive wherein the exhaust gases are normally discharged to the atmosphere at a point below the level of the body of water in which the watercraft is operating. A catalyst bed is provided in the exhaust sy... | 07/18/1995 |
| 5280708 | Exhaust gas purifying device for an outboard motor An exhaust gas purifying arrangement is provided for an outboard motor for a watercraft. At least one exhaust port is provided which opens into a first exhaust passage having a first catalyst member lining at least a portion of its inner wall. The first e... | 01/25/1994 |
| 5103931 | Exhaust silencing means for marine propulsion A number of embodiments of internal combustion engine exhaust systems each of which is effective to provide good silencing for exhaust gases through the use of an elastic diaphragm that dampens pulsations. In some embodiments, this elastic diaphragm forms... | 04/14/1992 |
| 4881370 | Exhaust device for outboard motor An improved exhaust system and bearing arrangement for a small displacement outboard motor that is rotatable through substantially 360 degrees for reverse operation. The drive shaft housing is formed with a reduced diameter cylindrical portion that is jou... | 11/21/1989 |
| 4607723 | Exhaust system for outboard motors Two embodiments of outboard motors incorporating improved silencing systems for the exhaust gases of the powering engine. In each embodiment, a Helmholtz resonator is provided by a resonance chamber formed at least in part by a spacer plate that is interp... | 08/26/1986 |
| 4036162 | Marine propulsion device having increased reverse thrust Disclosed herein is a marine propulsion device which comprises an engine having an exhaust port for discharging exhaust gas, and which also comprises a lower unit having an exhaust tube in communication with the exhaust port. The lower unit includes a cav... | 07/19/1977 |
| 3967446 | Exhaust relief silencing apparatus for marine propulsion systems A tuned exhaust gas relief system for marine propulsion systems, for example an outboard motor, includes a lower drive shaft housing coupled to a two stroke engine by a pair of intermediate stacked exhaust extension plates. The housing directs the exhaust... | 07/06/1976 |
