Porshe 911 (997). Manual - part 51

into the opposite off-centre blind hole bore. Any other bores are through-holes for guiding the oil.

Exhaust camshaft 1-3 in overlap

27. Insert exhaust camshaft 1 - 3. Lay the control chain on the flange for the chain sprocket, then insert the

camshaft at overlapping TDC of cylinder 1 (the cams of cylinder 1 point diagonally downwards towards
the outside of the cylinder head).

Exhaust sprocket 1 - 3 at 60° before TDC

28. Insert exhaust camshaft sprocket in the timing chain and position on camshaft flange. The four

threaded bores in the camshaft flange must be fully visible on the left at the slotted curves of the
sprocket -arrows-

 so that the Torx screws M6 x 12 can still be positioned to fasten the sprocket.

Exhaust sprocket 1 - 3, all screws fitted

Diagnostic system: reading out fault memory and activating systems

Installing camshafts, adjusting timing - engine removed

361

Installation position of housing

Note

Do not interchange the thrust bearings of the inlet and exhaust camshafts during assembly; observe
identification markings.

• 

29. Insert three thrust bearings and one housing -arrows- for the bearing sleeve of the camshafts together

with the guide rail for the timing chain.

Position of housing screws

30. Insert eight housing screws (Torx): six M6 x 35 -1- and two M6 x 40 -2- for camshaft bearing and guide

rail. Tighten screws evenly and just finger-tight.

Timing for side 1 - 3

Note

Position crankshaft above the pulley or vibration balancer before final adjustment of the timing to the
TDC marking.

• 

Note

Before final tightening (torque angle) of the central screw, the special tool adjusting gauge 9686
must be removed.

• 

31. Final timing adjustment for cylinder bank 1 - 3 is analogous to that for cylinder bank 4 - 6. ;

Diagnostic system: reading out fault memory and activating systems

Installing camshafts, adjusting timing - engine removed

362

Chain tensioner, cylinder 1 - 3

32. Fit chain tensioner for side 1 - 3 (hexagon a/f 32) before turning crankshaft to the TDC mark. Fit

chain tensioner with new sealing ring and tighten. → Tightening torque: 59 ftlb.

After adjusting the timing, this should be re-checked.

Slot position of camshafts at overlap

33. Turn the engine 360° at the crankshaft and fix at the TDC mark. Check camshaft position of

cylinder bank 4 - 6 using the adjusting gauge 9686. Then turn a further 360° and check the
camshaft position of cylinder bank 1 - 3.

Subsequent work for installing camshafts

Subsequent work for installing camshafts

Diagnostic system: reading out fault memory and activating systems

 Subsequent work for installing camshafts

363

Gaskets for spark plug recess and solenoid hydraulic valves

1. Insert solenoid hydraulic valves and new gaskets for the spark-plug recesses. Fit new O-rings into both

solenoid hydraulic valves and insert into the bores in the cylinder head. Grease O-rings with Optimol
MP3. → 153719 Removing and installing solenoid hydraulic valve NVS - chapter on "installing" and
→ 155519 Removing and installing solenoid hydraulic valve VHS - chapter on "installing".

2. Install cylinder head cover → 159119 Removing and installing cylinder head cover - chapter on

"installing".

3. Fit oil suction pump (1 - 3) and tandem pump (4 - 6) with new, micro-self-locking Torx screws M6.

Replace O-rings and grease with Optimol MP3. → Tightening torque: 7.5 ftlb.

4. Fit new plastic cap dry on cylinder head. Tap in with a plastic

hammer.

5. Fit ground strap to cylinder head 4 - 6 with Torx screw M8 x 20 and tighten. → Tightening torque: 17

ftlb.

6. Insert each ignition coil into its spark plug recess, fit two M6 x 25 Torx socket screws and tighten. →

Tightening torque: 7.5 ftlb.

7. Fit retainer plates and holders for the solenoid hydraulic valves. → 153719 Removing and installing

solenoid hydraulic valve NVS - chapter on "installing" and → 155519 Removing and installing
solenoid hydraulic valve VHS - chapter on "installing". → Tightening torque: 7.5 ftlb.

8. Fit holder for rear muffler. Fit and tighten two Torx screws M8 x 30 intake side and two Torx

screws M8 x 25 exhaust side. Fit cable plugs for ignition coils and solenoid hydraulic valves, fixing
cable in the sheetmetal clips. → Tightening torque: 17 ftlb.

9. Fit and tighten cover plate with two Torx screws M6 x 16. → Tightening torque: 7.5 ftlb.

10. Connect two cable plugs to the oil temperature switch for cylinder bank 4 -

6..

997110, 997111, 997310, 997311, 997410, 997411, 997610, 997611

WARNUNG

Gefahr des Verlusts der Text-Bild-Zuordnung beim Ausdruck.

Aus technischen Gründen kann derzeit nicht ausgeschlossen werden, dass trotz
einwandfreier Darstellung auf dem Bildschirm beim Ausdruck der
Zusammenhang von Text und zugehörigem Bild verloren geht.

• 

Wird der Fehler nicht bemerkt, besteht die Gefahr, daß Arbeiten nicht korrekt
durchgeführt werden und es dadurch zu Personen- und Sachschäden kommt.

• 

→ Vergleichen Sie deshalb nach dem Druckvorgang unbedingt die Ausdrucke mit der
Bildschirmdarstellung. Korrigieren Sie die Ausdrucke im Fehlerfall so, daß der Inhalt der
Bildschirmdarstellung zutreffend wiedergegeben wird.

WARNING

Diagnostic system: reading out fault memory and activating systems

Subsequent work for installing camshafts

364