Porshe 911 (997). Manual - part 59

 

  Index      Hummer     Porshe 911 997 series - service repair manual 2004-2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  57  58  59  60   ..

 

 

Porshe 911 (997). Manual - part 59

 

 

Cover plate and support for rear muffler

3. Remove cover plate for ignition coils -1- . Unscrew two M6 x 16 Torx screws and remove cover plate.

Rear muffler support

4. Remove support for rear muffler. Disconnect cable plugs of ignition coils and magnetic hydraulic

valves. Unscrew four Torx screws: intake side two M8 x 30, exhaust side two M8 x 25, remove
support.

5. For disassembling cylinder bank 4 - 6, undo the ground cable on the cylinder head by unscrewing a Torx

screw M8 and removing the cable. Disconnect two cable plugs from oil pressure switch.

Hydraulic valves for camshaft adjustment and ignition coils

6. Remove ignition coils -1- . In each case unscrew two Torx socket screws M6 x 25 and pull the

ignition coils out of the spark-plug recess.

7. Remove solenoid hydraulic valves -2- (NVS und VHS). → 153719 Removing and installing solenoid

hydraulic valve NVS - chapter on "removing" and → 155519 Removing and installing solenoid hydraulic
valve VHS - chapter on "removing".

Diagnostic system: reading out fault memory and activating systems

Preliminary work for removing camshafts

393

8. Remove spark plugs. → 287020 Removing and installing spark plugs - chapter on

"removing".

Oil suction pump for cylinders 1 - 3

9. Remove oil suction pump for cylinders 1 - 3. Unscrew four Torx screws M6 x 20

(micro-self-locking), remove oil suction pump, and replace O-ring and screws.

Tandem pump side 4 - 6

10. Remove tandem pump for cylinders 4 - 6. Unscrew four Torx screws M6 (micro-self-locking)

-1-

 . Pull off the vacuum line on pump -2- . Remove pump and replace O-rings and

micro-self-locking screws.

Removing camshaft - engine removed

Removing camshafts - engine removed

ATTENTION

Risk of damage due to particles of dirt.

Oil bores/oil ducts can become blocked up.

• 

→ When working on the engine, absolute cleanliness is essential.

→ Lay removed engine parts on a clean base and cover them without fail.

Diagnostic system: reading out fault memory and activating systems

 Removing camshaft - engine removed

394

→ Use the cover for dust protection when fitting the engine NR.165 on the engine assembly support.

1. Remove the plastic caps on the cylinder head. Press a small screwdriver into the centre of the piercing

point of each cap and lever out the cap.

TDC marking on pulley

2. Disassembling cylinder bank 1 - 3 Turn crankshaft at the pulley/vibration balancer clockwise to

the overlapping TDC of cylinder 1. Disassembling cylinder bank 4 -6 Turn crankshaft to the
TDC for cylinder 4. Using a locating pin 9595/1 fix the pulley or vibration balancer .

Position of the camshafts in overlapping TDC of cylinders 1 or 4

3. If the camshafts of cylinder bank 1 - 3 are removed, the smaller circular cut-outs at the grooves of the inlet

and outlet camshafts -arrows- of cylinder 1 must point to the cylinder head cover. For cylinder bank 4-6
the corresponding position is then on cylinder 4. Check the position using the adjusting gauge 9686.

Unscrew the central screw on the camshaft adjuster.

Note

Before disassembling the cylinder head cover, it is essential to unscrew the central screw on the
camshaft adjustment device.

• 

Diagnostic system: reading out fault memory and activating systems

Removing camshafts - engine removed

395

4. Unscrew the central screw on the camshaft adjustment device. Position retaining tool 9685 on the

hexagon of the adapter and place the contact block as a counter on the fitting bore of the cylinder head
cover for the oil suction pump; if necessary, position the contact block by undoing and tightening the
screw. If the special tool cannot be positioned on the hexagon of the adapter in this way, the engine must
be turned further in the direction of rotation at the pulley of the crankshaft until the contact block comes
into contact with the central screw of the cylinder head cover, ready for unscrewing. Unscrew the central
screw.

5. Remove cylinder head cover. → 159119 Removing and installing cylinder head cover- chapter on

"removing".

6. Release the four Torx screws M6 x 16 on the sprocket of the respective exhaust camshaft. Do not

remove the sprocket.

Chain tensioner, cylinders 1 - 3

7. Remove chain tensioner for cylinders 1 - 3 or 4 - 6.

Chain tensioner, cylinders 4 - 6

8. Cylinder bank 4 - 6 Unscrew guide rail screw M6 on pulley side (hexagon socket a/f 5).

9. Turn the engine at the assembly support so that cylinder bank to be worked on stands vertically upwards.

10. Unscrew four Torx screws for exhaust camshaft sprocket. Lift timing chain off sprocket and remove

the sprocket. Lay timing chain on the mounting tab for the sprocket.

11. Remove the four camshaft thrust bearings and the guide rail. Unscrew eight Torx screws, six M6 x

35, two M6 x 40 (screws for guide rail). Lift the thrust bearing and the guide rail carefully off the
mounting points or timing chain.

12. Remove the camshafts. Remove exhaust camshaft, lift timing chain off the camshaft adjuster of the

inlet camshaft and remove the camshaft. Lay the timing chain in the chain housing in the cylinder
head.

Diagnostic system: reading out fault memory and activating systems

Removing camshafts - engine removed

396

 

 

 

 

 

 

 

Content   ..  57  58  59  60   ..