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Home >> Porsche >> 2017 >> Cayenne S >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 10 - Engine - Crankcase, Suspension -- 92AA1 Cayenne 3.6L >> WM, 101802 Checking Pressure Loss Of Cylinders >> Preliminary Work

Preliminary Work

  1. Unscrew all spark plugs.

    > WM, 287020 REMOVING AND INSTALLING SPARK PLUGS

  2. Position cylinder to be tested to ignition TDC and remove tool (dead center finder).
    1. The dead center finder or "cylinder pipe" consists of a glass tube (inspection glass) with a piston -1-  , hose and a rubber cone -2-  .
      G14735379Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Dead center finder or "cylinder pipe" 

    2. The rubber cone is pressed onto the spark plug hole. The inspection glass is either held by a helper > Tool setup for dead center finder  or is secured vertically in a clearly visible position with a magnet.
      G14735380Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Tool setup for dead center finder 

    3. If the engine is now turned in direction of rotation on the crankshaft, the piston in the inspection glass is pressed up in the compression cycle > Piston up  in order to go back down immediately upon reaching the TDC. The piston in the inspection glass stays down in overlapping TDC > Piston down. 
      G14735381Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Piston up 

      G14735382Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Piston down 

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