In one embodiment, a method is provided. The method includes receiving a signal representative of an engine vibration transmitted via a knock sensor, wherein the knock sensor is disposed in an engine. The method additionally includes deriving a valve wear measurement during operation of the engine based on the signal. The method further includes communicating the valve wear measure.

An internal combustion engine includes a cam-actuated rocker arm assembly with a solenoid-actuated latch that provides for cylinder deactivation or variable valve actuation. The solenoid is in a position where its inductance varies significantly in relation to the position of a latch pin as it translates between latching and non-latching configurations. A sensor is positioned to monitor a current or a voltage in a circuit that includes the solenoid. The sensor data is analyzed to provide diagnostic information relating to the operation of the rocker arm assembly.

A valve system for an engine includes two cams each having a follower, a summation lever coupled to the followers, a lash adjuster, a valve actuating rocker pivotably coupled to the summation lever and resting on the lash adjuster, a control spring urging the summation lever to compress the lash adjuster, a stop limiting an expansion of the control spring, a bore, a plunger which moves in the bore, and an abutment surface. The control spring acts on the summation lever via the plunger. A plunger end engages with the summation lever. A point of contact between the plunger and the summation lever is displaced in a direction transverse to a plunger axis during a pivoting movement of the summation lever. A plunger shoulder is arranged a distance from the plunger end to contact the abutment surface to limit a plunger displacement in a direction compressing the lash adjuster.

An anti-rotation bracket for an internal combustion engine, including a peripheral wall having formed therein four outer apertures formed proximate to four corners of the bracket and a groove formed in a lower surface of the bracket, the groove forming a contiguous depression around the lower surface of the bracket and passing between each outer bolt aperture and a center of the bracket. The bracket further includes two tappet structures comprising tappet apertures, the tappet structures being centered inward from the peripheral wall, and an inner aperture positioned inward from the peripheral wall.

The invention relates to a blasting probe for introducing a granular blasting material into a cavity, in particular into a narrow coked cavity such as an inlet channel of a valve of an internal combustion engine, in particular for cleaning said cavity, comprising a blasting pipe (connectable, at a rear end thereof, to a blasting material feeding line, and a blasting nozzle at the front end of the blasting pipe, said blasting nozzle having at least one outlet opening for the blasting material which is radial with respect to the longitudinal axis of the blasting pipe and which is associated with a deflector surface arranged obliquely with respect to the longitudinal axis of the blasting pipe.

A valve system for an engine includes two cams each having a follower, a summation lever coupled to the followers, a lash adjuster, a valve actuating rocker pivotably coupled to the summation lever and resting on the lash adjuster, a control spring urging the summation lever to compress the lash adjuster, a stop limiting an expansion of the control spring, a bore, a plunger which moves in the bore, and an abutment surface. The control spring acts on the summation lever via the plunger. A plunger end engages with the summation lever. A point of contact between the plunger and the summation lever is displaced in a direction transverse to a plunger axis during a pivoting movement of the summation lever. A plunger shoulder is arranged a distance from the plunger end to contact the abutment surface to limit a plunger displacement in a direction compressing the lash adjuster.

A method is disclosed for adaptively controlling an engine system of a motor vehicle comprising the steps of evaluating the outputs from angular position sensors associated with inlet and exhaust camshafts of an engine of the engine system to establish whether differences between the currently measured positions and previously saved positions are the result of elongation of an endless drive used to drive the camshafts or due to some other reason. If it is confirmed that the differences are due to elongation of the endless drive then the measured values of angular position are used in the control of a number of engine functions.

A method for cleaning a continuously variable valve timing (CVVT) system for removing foreign materials includes: switching a target operating value of the CVVT system to a predetermined setting value within a set operating region and performing cleaning of the CVVT system; and determining whether a valve timing control learning request exists for the CVVT system, and, when the valve timing control learning request exists, aborting the cleaning.

A valve bridge for a valve train of an engine includes a bridge operating region via which the valve bridge can be operated by a first rocker arm and is movable translationally in a first operating direction, a first valve operating region via which a first gas exchange valve of the engine can be operated, and a second valve operating region via which a second gas exchange valve of the engine can be operated. The first valve operating region has a through opening continuous along the first operating direction, a first longitudinal region in which the through opening is completely continuously closed in its peripheral direction, and a second longitudinal region directly connected to the first longitudinal region in the first operating direction and in which the through opening is open along its peripheral direction at a first location in a first opening direction perpendicular to the first operating direction.

An engine brake test tool includes a fitting configured to be secured within a valve opening in an engine brake system, wherein the fitting includes a first opening configured to be placed into fluid communication with a pressurized fluid source and a second opening configured to be placed into fluid communication with an oil outlet line leading to a slave piston of an engine brake system.