Preliminary Work

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Information

Guided Fault Finding using the PIWIS Tester as well as the DME short test "Valve lift" must be performed before replacing the hydraulic valve. This is essential in order to avoid replacing the hydraulic valve unnecessarily.

The hydraulic valves are on the rear side of the cylinder heads facing the plenum panel.

Cylinder bank 1 to 3:
Remove vacuum pump → REMOVING VACUUM PUMP - section on "Removing".
Cylinder bank 4 to 6:
Disconnect coolant pipe.
1. 2.1. Loosen coolant pipe holder -1- . Two screws are fitted.
  
  Fig 1: Identifying Valve Lift Switchover Hydraulic Valves
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.