Abstract: An injector apparatus for an internal combustion engine and suitable for injecting two different fuels, namely a "pilot injection" liquid fuel and a "main injection" liquid or gaseous fuel comprising a low-pressure pump (1B) for pilot injection fuel feed, a high-pressure pump (1A) of the injection pump type, two fuel injectors, and a metering pump (30) selectively connecting the low-pressure pump, the high-pressure pump, and the two fuel injectors. The metering pump (30) includes a transfer piston (2) and two abutments (3, 4) which are independently adjustable so as to vary the relative importance of pilot injection and of main injection and also vary the extent to which the two injection stages overlap.

Abstract: The piston for an internal combustion engine, consisting of a piston head (1) and a body (2) of monobloc or two-piece construction, the head bearing upon the body (2) via at least two circular bearing surfaces (4, 5), the body (2) having a bearing part (6) receiving an articulation part (10) rigidly attached to the end of a connecting rod (3) and said bearing part (6) having on its piston head side a wall (7) forming a bearing whose bearing surface (8) is continuous, is structurally lighter in that the portion of its body (2) connecting the wall (7) to the bearing surfaces (4, 5) is formed of at least two thin, truncated conical partitions (11, 12) whose center lines (13, 14, 15, 16) are rectilinear, each of said partitions bearing upon a separate one of the circular bearing surfaces (4, 5).

Abstract: A method of damping hydraulic pressure waves and of removing peaks from pressure variations in the feed ducts of a hydraulic pump resulting from excess fluid returned with high kinetic energy to a feed chamber uses this kinetic energy directly to increase temporarily the volume of the feed chamber by a value lying in the range 10% to 30% of the maximum cylinder capacity of the hydraulic pump. The pump has a resiliently movable wall disposed in a feed chamber perpendicularly to the direction of a high kinetic energy jet of fluid from a passageway opening into the chamber. The wall is located on the axis of the passageway at a distance from the opening that is not more than 1.5 times the smallest diameter of the passageway. The invention also relates to a hydraulic pump for implementing the method. Applicable to fuel injection pumps in Diesel engines.

Abstract: A method of changing the direction of rotation of an internal combustion engine, and in particular of a marine engine, in which the camshafts (15) include two cams (16, 17) for each tappet (20) of a controlled member, each of said cams being suitable for use in one direction of rotation, the direction of rotation of the engine being changed by shifting said camshafts in translation, wherein, prior to shifting said camshafts, the tappets are rotated through one-fourth of a turn so as to put the axis of rotation of each tappet cam-follower wheel (10) orthogonal to the direction of camshaft translation. The invention also applies to an engine employing the method.