Preliminary Work

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Information

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Unscrew and remove all spark plugs. → REMOVING SPARK PLUGS
Position cylinder to be tested to ignition TDC and remove tool (dead center finder).
1. 2.1. The dead center finder or "cylinder pipe" consists of a glass tube (inspection glass) with a plunger -1- , hose and a rubber cone -2- .
  
  Fig 1: Identifying Dead Centre Finder (Cylinder Pipe)
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 2.2. The rubber cone is pressed onto the spark plug hole. The inspection glass is either held by a helper → Tool setup - dead center finder or is secured vertically in a clearly visible position with a magnet.
  
  Fig 2: Installing Tool (Dead Centre Finder)
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 2.3. If the engine is now turned in direction of rotation on the crankshaft, the plunger in the inspection glass is pressed up in the compression cycle → Plunger up in order to go back down immediately upon reaching the TDC. The plunger in the inspection glass stays down in overlapping TDC → Plunger down .
  
  Fig 3: Identifying Plunger Up Position
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  
  Fig 4: Identifying Plunger Down Position
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.