Installing Guide And Tensioning Rails

Fit deflector rail -4- by fitting the fastening screws -5- .

Fig 1: Exploded View Of Timing Chain And Sprockets
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. Double-chain camshaft drive
2. Camshaft sprocket
3. Screw, M12 x 140 Tighten completely after setting timing .
4. Deflector rail
5. Screw, M8 x 35 → Tightening torque: 32 Nm (24 ft lbs.)
6. Camshaft-to-camshaft guide pad
1. Direction of travel
Fit guide rail -3- . Small tensioning rail is locked with -6- at the guide rail. Slide guide rail onto the threaded pegs and move into the correct installation position with respect to the fitted drive chain for the oil pump. Pull locking pin (this brings the tensioning rail in contact).

Fig 2: Exploded View Of Guide Rail
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Slide tensioning rail onto threaded peg. -4-

Fig 3: Exploded View Of Timing Chain And Chain Guide
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. Threaded peg
2. Threaded pegs
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
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.
If you have not already done so, fit upper guide rails (guide pad) between the camshafts -6- .

Fig 4: Exploded View Of Timing Chain And Sprockets
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. Double-chain camshaft drive
2. Camshaft sprocket
3. Screw, M12 x 140 Tighten completely after setting timing .
4. Deflector rail
5. Screw, M8 x 35
6. Camshaft-to-camshaft guide pad
1. Direction of travel