A fuel injector mounting assembly in an opposed-piston engine allows for mounting of a fuel injector in a cylinder block without significantly deforming the wall of the cylinder into which the injector is configured to deliver fuel. The fuel injector mounting assembly includes a clamping arrangement to clamp the fuel injector to the cylinder block, an elongate tubular sleeve that sheathes a nozzle portion of the fuel injector, and a spanner nut attached to the elongate tubular sleeve. Clamping loads applied to retain the fuel injector in the cylinder block are controlled by the spanner nut.

An internal combustion engine system includes an engine head, a pressurized fuel supply conduit, and a fuel return conduit. Fuel injectors are positioned in fuel injector bores in the engine head, and each include an intensifier plunger, a nozzle check, an injection control valve, and an intensifier control valve. Fuel recovery fittings are coupled to the plurality of fuel injectors and each fluidly connect an actuation fuel outlet in one of the fuel injectors to the fuel return conduit.

An engine (1) includes a cylinder head (3), a retainer (80), a pressing member (70), and an injector (40). The cylinder head (3) has an attachment hole (15) formed therein. The retainer (80) is attached to the cylinder head (3). The pressing member (70) has a pressed surface (77) configured to be pressed by the retainer (80). The injector (40) is inserted into the attachment hole (15) and has an indentation (46) configured to be pressed by the pressing member (70). The indentation (46) is arranged inside the attachment hole (15). The pressed surface (77) is arranged outside the attachment hole (15).

An internal combustion engine system includes an engine head, a pressurized fuel supply conduit, and a fuel return conduit. Fuel injectors are positioned in fuel injector bores in the engine head, and each include an intensifier plunger, a nozzle check, an injection control valve, and an intensifier control valve. Fuel recovery fittings are coupled to the plurality of fuel injectors and each fluidly connect an actuation fuel outlet in one of the fuel injectors to the fuel return conduit.

A fuel delivery system for an engine includes a fuel rail cup, a fuel injector, and a retainer clip. The fuel rail cup extends along a longitudinal axis and defines an opening that extends radially outward from the longitudinal axis. The fuel injector has an upper end that is disposed within the opening such that the cup and fuel injector are aligned along the longitudinal axis. The retainer clip has a central body and at least one prong that protrudes upward from the central body. The central body engages the fuel injector and the at least one prong engages the fuel rail cup such that the clip inhibits axial movement of the fuel injector relative to the fuel rail cup along the longitudinal axis and such that the clip inhibits rotation of the fuel injector relative to the fuel rail cup about the longitudinal axis.

An intake assembly for an internal combustion engine, includes an intake manifold including a first plenum and a plurality of intake runners, the first plenum including an air supply inlet, the intake runners configured to be couplable to a cylinder head of the engine for supplying an air-fuel mixture thereto, the intake manifold configured such that, in use, air is supplied from the air supply inlet to the intake runners via the first plenum; a plurality of fuel injectors, each arranged to inject a fuel into one of the intake runners; and a fuel rail coupled to the plurality of fuel injectors, the fuel rail including a fuel supply inlet, and configured to supply fuel from the fuel supply inlet to the plurality of fuel injectors, in use. The fuel rail is mounted to the first plenum.

A fuel injector includes a nozzle body configured to be inserted into a fuel injector receiving bore of the internal combustion engine along a nozzle body axis; a valve housing held in fixed relationship to the nozzle body; and a first locating pin and a second locating pin each extending from the valve housing. The first locating pin extends from a first locating pin fixed end which is fixed to the valve housing to a first locating pin free end. The second locating pin extends from a second locating pin fixed end which is fixed to the valve housing to a second locating pin free end. The first locating pin and the second locating pin elastically deform when inserted into the bore, thereby preventing rotational movement of the fuel injector about the nozzle body axis.

An engine (1) includes a cylinder head (3), a retainer (80), a pressing member (70), and an injector (40). The cylinder head (3) has an attachment hole (15) formed therein. The retainer (80) is attached to the cylinder head (3). The pressing member (70) has a pressed surface (77) configured to be pressed by the retainer (80). The injector (40) is inserted into the attachment hole (15) and has an indentation (46) configured to be pressed by the pressing member (70). The indentation (46) is arranged inside the attachment hole (15). The pressed surface (77) is arranged outside the attachment hole (15).

A fuel injector isolator includes a support member which is rigid and which is annular in shape being centered about an axis such that the support member has a support member inner periphery which circumferentially surrounds the axis and includes a concave region. The fuel injector isolator also includes an isolation member which is resilient and compliant and which is annular in shape being centered about the axis such that the support member has an isolation member outer periphery and an isolation member inner periphery which accommodates the fuel injector therein. The isolation member is located within the support member inner periphery and includes 1) an isolation member outer periphery upper retention surface which engages the support member first end surface and 2) an isolation member outer periphery lower retention surface which extends into the concave region and engages the concave region of the support member.

A seal configuration for a fuel injector is disclosed. The seal configuration may include a seal ring within a seal groove of the fuel injector. The seal ring may be formed from a first material. The seal configuration may include a spacer ring within the seal groove of the fuel injector. The spacer ring may be formed from a second material. An outer diameter of the spacer ring may be greater than a diameter of a fuel injector bore of the fuel injector. The spacer ring may be configured to be adjacent the seal ring within the seal groove to form a seal of a fuel injector slot of an engine head of an engine, and the fuel injector slot is configured to support the fuel injector.