A cylinder head assembly is for an internal combustion engine. The cylinder head assembly includes a cylinder head and first and second valves coupled to the cylinder head. The first and second valves are associated with a combustion chamber partially defined by the cylinder head. The cylinder head assembly also includes a fixed member coupled to the cylinder head and a valve bridge engageable with the first and second valves. The valve bridge is axially moveable along an axis relative to the fixed member to move the first and second valves together between an open position and a closed position. The cylinder head assembly further includes an anti-rotation feature between the valve bridge and the fixed member. The anti-rotation feature restricts rotational movement of the valve bridge about the axis.

A retention member is configured to be supported within a cylinder head of an engine and includes a body portion and a plurality of arms. The body portion has an opening configured to receive a fuel injector of the engine. Additionally, the plurality of arms extends from the body portion and is configured to be positioned over a portion of a cross-head of the engine. The plurality of arms is spaced apart from the cross-head during routine operation of the engine.

A valve train assembly having a valve train carrier including a body having a cartridge cavity formed in the body, a hydraulic lash adjuster adjustment (HLA) assembly, and a cartridge removably disposed in the cartridge cavity. The cartridge includes a main body defining an inner bore, wherein the HLA assembly is disposed in the inner bore, and the cartridge is sized and shaped for insertion into the cartridge cavity formed in an underside of the valve train carrier. The cartridge is configured to have a valve train lash set prior to insertion into the cartridge cavity. A rocker arm assembly includes a body configured to engage the hydraulic lash adjustment (HLA) assembly, an end having a socket formed therein, and an e-foot extending through the socket and coupled to the end, the e-foot configured to maintain substantially flat contact with a top surface of an engine valve.

A cylinder head assembly is for an internal combustion engine. The cylinder head assembly includes a cylinder head and first and second valves coupled to the cylinder head. The first and second valves are associated with a combustion chamber partially defined by the cylinder head. The cylinder head assembly also includes a fixed member coupled to the cylinder head and a valve bridge engageable with the first and second valves. The valve bridge is axially moveable along an axis relative to the fixed member to move the first and second valves together between an open position and a closed position. The cylinder head assembly further includes an anti-rotation feature between the valve bridge and the fixed member. The anti-rotation feature restricts rotational movement of the valve bridge about the axis.

An improved cam follower for a vehicle engine includes a body, a spring seat, a tower, a spring and an anti-rotation member. The body defines a body diameter, a first open end, and a second end. The spring seat includes a spring seat opening and an interlock portion. The spring seat may be affixed to the first open end of the body. The spring seat further includes a spring seat diameter wherein the spring seat diameter is greater than the body diameter. The tower may be disposed in a pin housing through the spring seat opening at the first open end of the body. The tower further includes an upper flange and a spring which abuts the upper flange at a first spring end. The second spring end abuts the spring seat. The anti-rotation member accordingly may be coupled to the body via the spring seat.

An improved cam follower for a vehicle engine includes a body, a spring seat, a tower, a spring and an anti-rotation member. The body defines a body diameter, a first open end, and a second end. The spring seat includes a spring seat opening and an interlock portion. The spring seat may be affixed to the first open end of the body. The spring seat further includes a spring seat diameter wherein the spring seat diameter is greater than the body diameter. The tower may be disposed in a pin housing through the spring seat opening at the first open end of the body. The tower further includes an upper flange and a spring which abuts the upper flange at a first spring end. The second spring end abuts the spring seat. The anti-rotation member accordingly may be coupled to the body via the spring seat.

A system and method for mechanically timed cylinder deactivation includes an inner passage in the camshaft that supplies fluid for deactivating one or more valve opening mechanisms associated with the cylinders of an internal combustion engine.

A valve train assembly having a valve train carrier including a body having a cartridge cavity formed in the body, a hydraulic lash adjuster adjustment (HLA) assembly, and a cartridge removably disposed in the cartridge cavity. The cartridge includes a main body defining an inner bore, wherein the HLA assembly is disposed in the inner bore, and the cartridge is sized and shaped for insertion into the cartridge cavity formed in an underside of the valve train carrier. The cartridge is configured to have a valve train lash set prior to insertion into the cartridge cavity. A rocker arm assembly includes a body configured to engage the hydraulic lash adjustment (HLA) assembly, an end having a socket formed therein, and an e-foot extending through the socket and coupled to the end, the e-foot configured to maintain substantially flat contact with a top surface of an engine valve.

A deactivating hydraulic lash adjustment (HLA) assembly includes an outer body configured to be received within a cartridge for a valve train carrier, a plunger disposed at least partially within the outer body, the plunger including a hollowed inner area, and an inner body disposed at least partially within the outer body and at least partially within the hollowed inner area. The inner body includes a low pressure chamber defined therein, and a high pressure chamber is defined between the plunger and the inner body within the hollowed inner area. The plunger is movable relative to the outer body and the inner body.

Valvetrain of an internal combustion engine, including a rocker support, a fulcrum, and a rocker. The rocker support is mounted to a cylinder head and fixed relative thereto. The rocker is positioned about the rocker support and partially in an axial aligning groove of the rocker support. The fulcrum is sandwiched between the rocker support and the rocker. The rocker oscillates about the fulcrum as forces are received and applied to a first and a second end of the rocker.