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A system for actuating an engine valve to decompress an engine cylinder for engine start up and/or engine braking is disclosed. The system may include a first member, such as an outer piston, disposed above an engine valve, which receives an inner piston extending into a bore provided in the first m

A system for actuating an engine valve to decompress an engine cylinder for engine start up and/or engine braking is disclosed. The system may include a first member, such as an outer piston, disposed above an engine valve, which receives an inner piston extending into a bore provided in the first member. One or more springs may bias the inner piston into a predefined position in the first member. The inner piston may include a lower surface that directly, or through an intervening sliding pin, actuates an engine valve in response to the application of fluid pressure on the inner piston. The inner piston may be used to decompress an engine cylinder for engine start up and/or to provide engine braking.

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1. A system for actuating an engine valve to decompress an engine cylinder or provide engine bleeder braking comprising: a first vertically moveable member disposed above an engine valve, said vertically moveable member having an inner piston bore extending horizontally into the vertically moveable

1. A system for actuating an engine valve to decompress an engine cylinder or provide engine bleeder braking comprising: a first vertically moveable member disposed above an engine valve, said vertically moveable member having an inner piston bore extending horizontally into the vertically moveable member;means for moving the vertically moveable member;an inner piston provided in the horizontally extending inner piston bore, said inner piston having a recessed surface;means for moving the inner piston relative to the inner piston bore; anda second vertically moveable member contacting the recessed surface of the inner piston. 2. The system of claim 1, wherein the means for moving the inner piston relative to the inner piston bore comprises a means for moving the inner piston in a horizontal axial direction. 3. The system of claim 1, further comprising: a first fluid supply passage extending between the means for moving the inner piston and the inner piston bore,wherein the means for moving the inner piston comprises a fluid control valve. 4. The system of claim 1, wherein the means for moving the inner piston relative to the inner piston bore comprises a means for rotating the inner piston within the inner piston bore. 5. The system of claim 1, further comprising: a housing having an outer piston bore,wherein the first vertically moveable member comprises an outer piston disposed in the outer piston bore. 6. The system of claim 5, further comprising: a hydraulic lash adjuster assembly extending through the housing into the outer piston bore. 7. The system of claim 1, wherein the first vertically moveable member is a valve bridge. 8. The system of claim 1, wherein the means for moving the first vertically moveable member comprises a lash screw. 9. The system of claim 1 wherein the means for moving the first vertically moveable member comprises a horizontally sliding member. 10. The system of claim 1, further comprising a first spring provided in the inner piston bore, said first spring biasing the inner piston into a predefined position in the inner piston bore. 11. The system of claim 10 further comprising a second spring provided in the inner piston bore, said second spring biasing the inner piston in a direction opposite to that of the first spring. 12. The system of claim 10 further comprising: an interior bore provided in the inner piston,wherein the first spring extends into the interior bore. 13. The system of claim 10, wherein said inner piston bore has a larger diameter portion and a smaller diameter portion, wherein the system further comprises a second spring disposed in the larger diameter portion of the inner piston bore, and wherein the second spring biases the inner piston in the same direction as the first spring. 14. The system of claim 1, further comprising: a vertically oriented sliding pin bore extending through a lower portion of the inner piston to the inner piston bore,wherein the second vertically moveable member comprises a sliding pin disposed in the sliding pin bore. 15. The system of claim 1, wherein the second vertically moveable member comprises an engine valve stem. 16. The system of claim 1, further comprising a spring biasing the second vertically moveable member into contact with the recessed surface of the inner piston. 17. The system of claim 1 wherein the recessed surface of the inner piston includes first and second recesses of different depths. 18. The system of claim 3, further comprising: a housing having an outer piston bore;an outer piston disposed in the outer piston bore, wherein the outer piston comprises the first vertically moveable member; anda second fluid supply passage extending between the means for moving the first vertically moveable member and the outer piston bore. 19. The system of claim 18, further comprising a second fluid control valve, wherein the second fluid control valve comprises the means for moving the first vertically moveable member. 20. The system of claim 18, further comprising a master piston assembly in hydraulic communication with the second fluid supply passage. 21. The system of claim 18, further comprising: a hydraulic lash adjuster assembly extending through the housing into the outer piston bore. 22. A system for actuating an engine valve to decompress an engine cylinder or provide engine bleeder braking comprising: housing mounted in an engine above one side of a valve bridge;a piston bore extending horizontally into the housing;a hydraulic fluid supply passage communicating with the piston bore;an actuator piston disposed in the piston bore, said actuator piston having an interior chamber with an end wall;a spring biasing the actuator piston into the piston bore in a direction which causes the actuator piston to engage an underlying engine valve bridge;a sleeve disposed in the interior chamber; anda spring biasing the sleeve away from the interior chamber end wall. 23. A system for actuating an engine valve to decompress an engine cylinder comprising: a housing having an outer piston bore extending vertically into the housing, and a first fluid supply passage extending through the housing to the outer piston bore;an outer piston disposed in the outer piston bore, said outer piston having an inner piston bore extending vertically into the outer piston and having a fluid passage extending through the outer piston to the inner piston bore, wherein said fluid passage is located to register with the first fluid supply passage;one or more recesses formed along the outer piston bore; means for moving the outer piston;an inner piston provided in the inner piston bore, said inner piston having a hollow interior defined by an inner piston wall, wherein an interior surface of the inner piston wall is stepped to form a shoulder;one or more openings provided in the inner piston wall, said one or more openings adapted to register with the one or more recesses formed along the outer piston bore;a first spring provided in the outer piston bore between an upper end of the outer piston and the inner piston shoulder;a locking piston disposed in the inner piston hollow interior;a spring provided in the inner piston hollow interior between the inner piston and the locking piston; anda ball or roller disposed in the one or more openings provided in the inner piston wall, said ball or roller further disposed between the locking piston and the outer piston. 24. The system of claim 23, wherein a valve bridge comprises the housing. 25. The system of claim 24, wherein a rocker arm comprises the means for moving the outer piston. 26. The system of claim 23, wherein a lash adjustment screw comprises the means for moving the outer piston. 27. The system of claim 23, further comprising: a second fluid supply passage extending through the housing to the outer piston bore.