Preliminary Work

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Unscrew and remove all spark plugs.
> 287020 REMOVING AND INSTALLING SPARK PLUGS

Position cylinder to be tested to ignition TDC and remove tool (dead centre finder).

2.1 The dead centre finder or "cylinder pipe" consists of a glass tube (inspection glass) with a piston -1- , hose and a rubber cone -2- .

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Dead centre finder - "cylinder pipe"

2.2 The rubber taper is pressed onto the spark plug hole. The inspection glass is either held by a helper > Tool setup - dead centre finder or is secured vertically in a clearly visible position with a magnet.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Tool setup - dead centre finder

2.3 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 > Top piston in order to go back down immediately upon reaching the TDC. The piston in the inspection glass stays down in overlapping TDC > Bottom piston .

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Top piston

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Bottom piston