Porshe 911 (997). Manual - part 53

Designation of adjuster 4 -6

Note

Side 4 - 6: the arrow should be attached clockwise

• 

–  Designation, side 4 - 6:

Part number, cylinder bank, manufacturer information, direction of rotation of engine (arrow),
production date.

• 

Allocation of chain tensioners

Allocation of chain tensioners

Primary chain tensioner

–  Primary chain tensioner on crankcase (oil filter area), identification: one ring

-arrow-

Diagnostic system: reading out fault memory and activating systems

Allocation of inlet camshaft adjustment device

369

Chain tensioner, cylinders 1 - 3

–  Chain tensioner on cylinder head, cylinder bank 1 - 3, identification: two rings

-arrows-

Chain tensioner 4 - 6

–  Chain tensioner on cylinder head, cylinder bank 4 - 6, no

identification.

Preliminary work for removing camshafts

Preliminary work for removing camshafts

1. Remove engine → 100119 Removing and installing engine - chapter on

"removing".

2. Remove rear muffler → 263319 Removing and installing rear muffler - chapter on "removing".

Diagnostic system: reading out fault memory and activating systems

Allocation of chain tensioners

370

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

371

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

372