Porshe 911 (997). Manual - part 60

 

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Porshe 911 (997). Manual - part 60

 

 

Installing camshaft - engine removed

Installing camshafts, adjusting timing - 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.

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

Identification of camshaft housing:

Identification of housings of camshafts:

Inlet camshaft:

• 

Thrust bearing:

 'E' and matching number on cylinder head/cylinder head cover

• 

Housing of bearing sleeve:

 only matching number

• 

Outlet camshaft:

• 

Thrust bearing on sprocket:

 '1A' and matching number on cylinder head/cylinder head cover

• 

2nd Thrust bearing:

 '2A' and matching number on cylinder head/cylinder head cover

• 

Diagnostic system: reading out fault memory and activating systems

 Installing camshaft - engine removed

397

Pulley fixed at 60° before TDC

1. To remove the play from the timing chain drive, turn the crankshaft by means of the pulley or

vibration balancerclockwise (running direction of engine to 60° before TDC : marking U6 on
pulley or vibration balancer coincides with fixing bore in crankcase

. Fix with locating pin

9595/1

.

Assembly of cylinder bank 4 - 6

2. Turn the engine on the assembly support until cylinder bank 4 - 6 stands vertically upwards.

3. Oil the bearing surfaces of the camshafts with new engine oil.

Inlet camshaft 4 - 6 in overlap

4. Insert inlet camshaft 4 - 6. Pull the timing chain out of the chain housing of the cylinder head with a

welding wire and position on the ring gear of the camshaft adjuster, at the same time inserting the
camshaft at overlapping TDC of cylinder 4 (the cams of cylinder 4 point towards the bulkhead of
the flat-base tappet housing -arrows- ).

Position of bearing sleeve for inlet camshaft

Note

Make sure that the bearing sleeve on the inlet camshaft is positioned correctly.

• 

Diagnostic system: reading out fault memory and activating systems

Installing camshafts, adjusting timing - engine removed

398

5. The bearing sleeve of the inlet camshaft must be positioned so that the centrally bored blind hole points

vertically upwards -arrow- (the rib of the cylinder head should also be at the centre in relation to the
bearing sleeve). In this position, the dowel pin in the bearing bore of the cylinder head will fit precisely
into the opposite off-centre blind hole bore. Any other bores are through-holes for guiding the oil.

Exhaust camshaft 4 - 6

6. Insert exhaust camshaft 4 - 6. Lay the timing chain on the flange for the sprocket, then insert the camshaft

at overlapping TDC of cylinder 4 (the outlet cams of cylinder 4 point towards the cams of the inlet
camshaft -arrows- ).

Position of sprocket 4 - 6 at 60° before TDC

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

bores in the camshaft flange must be covered by the slots of the sprocket in the clockwise running
direction of the engine

 approximately half way -arrows- .

8. Oil the bearing surfaces of the camshafts with new engine oil.

Installation position of housing

Note

Diagnostic system: reading out fault memory and activating systems

Installing camshafts, adjusting timing - engine removed

399

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

• 

9. 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

10. 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.

Adjust timing, cylinder bank 4 - 6

Slot position of camshafts at overlap

11. Align both camshafts. The small circular cut-outs must point upwards -arrows- .

Position of adjusting gauge 9689

12. Using special tool adjusting gauge 9686, fix camshafts (if necessary with the gauge twisted) with

an M8 screw (e.g. hexagon-head bolt M8 x 16). The flat tool face points upwards. Screw in
fastening screw by hand.

13. Screw the housing screws of the inlet and exhaust camshafts and the auxiliary screw of the

adjustment gauge alternately by approx. another 90° until the specified tightening torque is
reached. → Tightening torque: 7.5 ftlb.

Diagnostic system: reading out fault memory and activating systems

Installing camshafts, adjusting timing - engine removed

400

 

 

 

 

 

 

 

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