Classification Of Pistons And Connecting Rods

Information 

• For more information, see Porsche Spare Parts Catalogue. 

Allocation of connecting-rod bearing shells: 

The connecting-rod bearing classification sequence begins at connecting-rod bearings 1+4

The combination of bearing shells red/blue and blue/red have the same tolerance class as yellow/yellow.

1. Insert piston -1-  into the cylinder bore.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Fitting piston

   1. 1.1  Remove connecting-rod bearing cap again.
   2. 1.2  Oil the cylinder wall.
   3. 1.3 V6 Turbo only: 

      Fit > T40369 - funnel-2-  on cylinder block.

      V8 biturbo only: 

      Fit > T90004 - funnel  on cylinder block.

   4. 1.4  Push piston -1-  into the cylinder bore from above by hand according to the marking using > T40369 - funnel  or > T90004 - funnel  (-2-  ) -Arrow-  .

      The arrow on the piston crown must be facing the pulley side of the engine. The marking L or R next to the arrow indicates assignment to the left or right cylinder bank.

2. Fit connecting rod and piston -3-  on the crankshaft.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Piston and connecting rod on crankshaft

   1. 2.1  Replace connecting-rod bearing shells and connecting-rod bearing cap screws -1-  .
   2. 2.2  Oil the running surfaces of the connecting-rod bearing shells.
   3. 2.3  Fit connecting rod on the crankshaft.
   4. 2.4  Fit connecting-rod bearing cap -2-  with new connecting-rod bearing shells on the connecting rod. Check that the retaining lugs are fitted correctly.
   5. 2.5 Oil new  connecting-rod bearing cap screws -1-  and fit and tighten them.

      > Initial tightening 50 Nm (37 ftlb.) 

      > Final tightening + 90° 

3. Check the clearance of the oil spray jets.