Preliminary Work

Information 

The pictures shown in this document may differ from the original.

1. Unscrew and remove all spark plugs.

   > 287020 REMOVING AND INSTALLING SPARK PLUGS

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

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

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Dead centre finder - "cylinder pipe"

   The rubber cone 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

   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  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Plunger up

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Plunger down