Intake Cycle (Overlapping TDC)

Information 

• This method only works in ignition rod modules that have rubber seals facing the spark-plug recess. 

1. Remove spark plugs for the relevant cylinder 3. → WM 287020 REMOVING AND INSTALLING SPARK PLUGS ON DFI ENGINES (EXCEPT CAYENNE DIESEL)
   Fig 1: Removing V8 Spark Plugs

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2. Find overlapping TDC of cylinder 1. To do this, insert the ignition rod module of the first cylinder into the corresponding opening in the valve cover and press in firmly.
   Fig 2: Identifying Ignition Rod Module Of Cylinder 1

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3. Twist the crankshaft in the direction of rotation until the ignition rod module comes out again with an audible plop.
   Fig 3: Identifying Ignition Rod Module Of Cylinder 1 Pops Out

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4. Then twist the crankshaft until the fixing bore on the crankshaft belt pulley is aligned with the bore in the timing case cover. The engine is now located in the ignition TDC of cylinder 1.
   Fig 4: Identifying TDC Marking Of Cylinder 1

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   Information 

   • If the crankshaft is then turned through 180°, the piston in cylinder 1 will be located in the bottom dead centre (BDC). The compression cycle then follows. 
5. Remove the marking mandrel if necessary and twist the crankshaft through 360° in the direction of motion. The engine is now located in the overlapping TDC of cylinder 1.
   Fig 5: Identifying TDC Marking Of Cylinder 1

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