Removing Guide And Tensioning Rails

Information 

• The rolling direction of the timing chain must always be the same  .
• If the timing chain is to be reused, the rolling direction of the timing chain must be marked before it is removed  .

Information 

If the timing chain has to be removed or replaced, check the guide and tensioning rails as well as the chain pinions for wear and scoring and replace them if necessary.

1. Remove top guide rails (guide pad) between the camshafts if you have not already done so -6-  .
   Fig 1: Identifying Timing Chain And Sprockets

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   1. Double-Chain Camshaft Drive
   2. Camshaft Sprocket
   3. Screw, M12 Tighten fully after setting timing  .
   4. Deflector Rail
   5. Screw, M8 x 35
   6. Camshaft-To-Camshaft Guide Pad
   1. Direction Of Travel
2. Pull tensioning rail off the threaded peg. -4- 
   Fig 2: Identifying Timing Chain And Chain Guide

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   1. Threaded Peg
   2. Threaded Peg
   3. Guide Rail
   4. Tensioning Rail
   5. Chain Tensioner With Sealing Ring
   6. Pin (For Locking The Oil-Pump Tensioning Rail)
   1. Direction Of Travel
3. Carefully slacken the lower tensioning rail for the oil pump chain. Press the tensioning rail back with a small screwdriver until both staking holes between the tensioning rail and guide rail are aligned. → Oil pump tensioning rail 
   Fig 3: Pressing Oil Pump Tensioning Rail

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
4. Stake tensioning rail for oil pump chain through the hole in the guide rail using a suitable drill bit, drift punch or nail. This slackens the oil pump chain. → Staking tensioning rail for oil pump chain 
   Fig 4: Staking Tensioning Rail For Oil Pump Chain

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5. Remove guide rail -3-  . Guide rail for oil pump chain is locked with -6-  .
   Fig 5: Identifying Guide Rail

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6. Remove deflector rail -4-  by loosening the fastening screws -5-  .
   Fig 6: Identifying Timing Chain And Sprockets

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   1. Double-Chain Camshaft Drive
   2. Camshaft Sprocket
   3. Screw, M12 Tighten Fully After Setting Timing  .
   4. Deflector Rail
   5. Screw, M8 x 35
   6. Camshaft-To-Camshaft Guide Pad
   1. Direction Of Travel