Preliminary Work

1. Remove timing chain.

   > 153519 - REMOVING AND INSTALLING TIMING CHAIN (R4) 

   Removing guide and tensioning rails 

Information 

The following guide and tensioning rails are already removed together with the timing chain:

• Side guide rail - valve drive timing chain 
• Top guide rail - valve drive timing chain 
• Tensioning rail - valve drive timing chain 
• Tensioning rail - oil pump drive timing chain 
• Side guide rail - balance shaft timing chain 
• Tensioning rail - balance shaft timing chain 

1. Remove upper guide rail -1-  for balance shaft timing chain.
   1. 1.1  Unscrew guide pins -2-  .
   2. 1.2  Remove upper guide rail -1-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Upper guide rail - balance shaft timing chain