A system for maneuvering a boat including a hull and an outboard motor includes a left tilt shaft, a right tilt shaft, a steering shaft support, and a hydraulic cylinder. At least a portion of the hydraulic cylinder is between the left tilt shaft and the right tilt shaft. The hydraulic cylinder exerts a steering force on the outboard motor to rotate the outboard motor about a steering shaft. A hydraulic pump supplies hydraulic fluid to the hydraulic cylinder. One of the left tilt shaft and the right tilt shaft includes a first hole. A portion of the stroke range of the hydraulic cylinder is located within the first hole.

A debris protective fitting for a jet inlet of a outboard jet motor with stationary grill bars across the jet intake in front and rear slots with empty front slots provided between the stationary grill bars. Movable grill bars are supported across the jet intake in the empty front slots and a heel plate. The heel plate cups a rear of the jet intake and includes a center mounted stud for attachment of a push-pull cable for rotating the movable grill bars into alignment with the stationary grill bars forming a screen across the jet intake opening. As the movable grill bars are rotated away from the jet intake opening, the spacing between the bars in the screen is doubled causing rocks and other debris to be dislodged and fall out. Cleaning of the screen is thus accomplished without stopping the outboard jet motor or getting out of the jet boat.

An outboard motor includes a shift switch including a shift shaft and a rotary drive provided on an axis of the shift shaft and that rotates the shift shaft, and that switches a rotation direction of a propeller shaft. An entirety of the rotary drive is disposed below a mount, and at least a portion of the rotary drive is disposed above a lower case.

An objective of the disclosure is to provide a simulation method for a two-stage plunger pressurized common rail fuel system of a marine low-speed engine. The method includes: first setting initial status parameters, such as a control step of a system model, a total time of a calculation process, and structure parameters and pressures of components; and then establishing a mathematical model of a fuel booster unit, a mathematical model of a high-pressure fuel pipe and a mathematical model of a fuel injector based on a MATLAB simulation platform, and connecting input and output parameters of the models to realize data transfer between the models. By considering one-dimensional (1D) spatial fluctuations in the high-pressure fuel pipe, the disclosure establishes a high-precision model of the fuel system, which provides an effective method for designing and calculating detailed pressures in the common rail fuel system.

An outboard motor includes an engine, a fuel tank, a fuel pathway, a fuel pump, and a controller. The engine includes a fuel injector. The fuel tank includes an internal space in which fuel is stored. The fuel pathway is connected to the fuel injector and the fuel tank. The fuel pump is disposed in the fuel pathway, and supplies the fuel from the fuel tank to the fuel injector. The controller controls the fuel pump. The controller determines whether or not a start condition, indicating that air has entered the fuel pathway, is satisfied. The controller is configured or programmed to execute an air releasing control to open the fuel injector and drive the fuel pump when the start condition is satisfied.

A marine engine has first and second banks of cylinders; a supercharger configured to supply charge air for combustion in the first and second banks of cylinders; first and second charge air coolers configured to cool the charge air, wherein the first and second charge air coolers each have an upstream inlet that receives the charge air from the supercharger, a downstream outlet that discharges the charge air for combustion in the marine engine, and a bypass port for conveying a portion of the charge air, the bypass port being located downstream of the inlet and upstream of the outlet; a recirculation passage coupled to the first charge air cooler, the recirculation passage conveying the portion of the charge air from the bypass port of the first charge air cooler back to the supercharger; and a mounting plate coupled to the second charge air cooler, the mounting plate preventing flow of the portion of charge air through the bypass port of the second charge air cooler.

Provided is an outboard motor raising and lowering apparatus that is capable of automatically changing the speed of raising/lowering of an outboard motor according to the status of the outboard motor. An outboard motor raising and lowering apparatus (1) includes: a first fluid passage that connects a pump (42) and a lower chamber(s) of one or more tilt cylinders (14); a second fluid passage that connects the first fluid passage and a lower chamber(s) of one or more trim cylinders (12); a switching valve (60) provided at the second fluid passage; and a control section (100) configured to control the switching valve (60) with reference to a watercraft status signal.

A system for maneuvering a boat including a hull and an outboard motor includes a left tilt shaft, a right tilt shaft, a steering shaft support, and a hydraulic cylinder. At least a portion of the hydraulic cylinder is between the left tilt shaft and the right tilt shaft. The hydraulic cylinder exerts a steering force on the outboard motor to rotate the outboard motor about a steering shaft. A hydraulic pump supplies hydraulic fluid to the hydraulic cylinder. One of the left tilt shaft and the right tilt shaft includes a first hole. A portion of the stroke range of the hydraulic cylinder is located within the first hole.

A method to fill hydraulic oil in hydraulic steering systems for boats. The method uses a closed system to reduce mess and waste, but does not require power and can be performed by a single operator. A bleed lock is secured to a ram's bleeders and hydraulic oil fed to a helm. By rotating a boat's steering wheel and moving the motor, air will flow out of the system into the bottle and hydraulic oil will flow into the system.

A method to fill hydraulic oil in hydraulic steering systems for boats. The method uses a closed system to reduce mess and waste, but does not require power and can be performed by a single operator. A bleed lock is secured to a ram's bleeders and hydraulic oil fed to a helm. By rotating a boat's steering wheel and moving the motor, air will flow out of the system into the bottle and hydraulic oil will flow into the system.