WM 1001IN Determining The Operating Cycle Of Cylinder 1 (Except Cayenne Diesel, Cayenne GTS Tip "PORSCHE Design Edition 3"): Information: Overview

Determining the operating cycle of cylinder 1 with the "cylinder pipe" dead centre finder. 

Information 

An alternative method for determining the overlapping TDC is the "cylinder pipe" (dead centre finder). This tool is part of the pressure-loss tester WE 1066.

For some tasks, it is necessary to be familiar with the position of the piston in the cylinder (ignition TDC, overlapping TDC).

Ignition is off, ignition key is removed.

1. Remove spark plugs for the relevant cylinder. → Removing Spark Plugs
   Fig 1: Removing V8 Spark Plugs

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   Fig 2: Removing Spark Plugs Using Spark Plug Wrench - V6

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. The dead centre finder or "cylinder pipe" consists of a glass tube (inspection glass) with a piston -1-  , hose and a rubber cone -2-  .
   Fig 3: Identifying Dead Centre Finder - Cylinder Pipe

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. The rubber cone is pressed onto the spark plug hole. The inspection glass is either held by a helper or is secured vertically in a clearly visible position with a magnet.
   Fig 4: Identifying Tool Setup - Dead Centre Finder

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
4. 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 in order to go back down immediately upon reaching the TDC. The piston in the inspection glass stays down in overlapping TDC.
   Fig 5: Identifying Engine Piston Up

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   Fig 6: Identifying Engine Piston Down

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.