Component Markings And Distinguishing Features

Information 

Distinguishing features of the camshafts:

• The outlet camshaft has high-pressure pump cams. 
• The intake camshaft has a sensor wheel on the shaft end piece. 
• Cylinder bank 1: The camshaft has sliding cams on cylinders 2 and 3. 
• Cylinder bank 2: The camshaft has sliding cams on cylinders 5 and 8. 

Information 

Allocation of bearing covers to the cylinder head cover:

• The bearing covers and cylinder head covers are marked with unique (three-digit) matching numbers. 
• On the cylinder head cover, the last three digits of the clear text marking are relevant for the matching allocation. 
• This matching number is used to allocate the bearing covers clearly to a specific cylinder head cover. 

Fig 1: Bearing Cover/Cylinder Head Cover 1 To 4 Components Location

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Marking for bearing cover/cylinder head cover 1 to 4

Information 

The procedure for removing and installing is described for one side as an example. The procedure for the other side is almost identical.

Information 

When installing the bearing covers, always make sure that the parts are allocated correctly (three-digit matching number)!

Information 

The axial bearing washers must be fitted ahead of the camshafts in the center bearing in the cylinder head cover.

1. Installation is performed in reverse order. Pay particular attention to the following:
   Fig 2: Camshaft Bearing Cover Screws Tightening Sequence

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Tightening sequence for camshaft bearing cover

   1. 1.1  Oil the bearing surfaces of the camshafts with new engine oil. When rebuilding the engine, apply Optimol Optipit grease (Part No. 000.043.204.17) on the bearing locations.
   2. 1.2  Insert axial bearing washers ahead of the camshafts in the center bearing in the cylinder head cover.

      Information 

      • The housings are marked E for intake camshaft and A for outlet camshaft. The housings are numbered consecutively by cylinder. 
      • The bearing covers are seated very securely in the cylinder head cover because of a dowel sleeve. Carefully jiggle free using a pliers if necessary. Place on a marked, clean surface. 
      • The bearing covers are allocated to the respective cylinder head cover by a three-digit number. On the cylinder head cover, the last three digits of the clear text marking are relevant for the matching allocation. 
   3. 1.3  Insert camshafts without tension into the cylinder head covers.
      1. 1.3.1  Fit camshaft bearing covers at the required positions and check marking for intake and outlet camshafts and cylinder allocation at the same time! 
      2. 1.3.2  Replace camshaft bearing cover screws -1 to 20-  .
      3. 1.3.3  Fit new camshaft bearing cover screws by hand and tighten in the sequence -1 to 20-  .

         > Initial tightening 3 Nm (2 ftlb.) 

         > Final tightening + 30°