Porshe 911 (997). Manual - part 82

Preliminary work for disassembling cylinder head

Preliminary work for disassembling cylinder head

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

"removing".

2. Remove transmission → 343527 Removing and mounting transmission - chapter on "Removing" or

→ 373527 Removing and mounting automatic transmission - chapter on "Removing" [997110 997111
997120 997121 997310 997311 997320 997321]→ 373527 A3 Removing and mounting automatic
transmission - chapter on "Removing" [997410 997411 997430 997431 997610 997611 997620 997621].

3. Remove cylinder head → 157019 Removing and installing cylinder head - chapter on "Removing".

Disassembling cylinder head

Disassembling cylinder head

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.

The following tool is used and recommended for the described work: commercially available tool Valve
keys assembly- disassembly tool for Boxster + Carrera NR.54

 (Sauer Co., Art. No. for standard case 600

50 00).

Diagnostic system: reading out fault memory and activating systems

Tools

485

Disassembling and assembling cylinder head tools

Item

Designation

Explanation

A

Shaft (ø 20 x 450 mm)

Art. No. 602 45 15

B

Aluminium supports, slotted, 2-piece

Art. No. 602 36 20

C

Lever arm

Art. No. 602 35 30

E

Joint with screw

Art. No. 602 45 20

E

Disassembly head with magnet

Art. No. 602 46 50

F

Assembly head 1b (for valve keys)

Art. No. 600 01 02

G

Pressure pieces Gr. 6a, 3-piece

Art. No. 600 60 15

H

Plates, 3-piece

Art. No. 602 56 65

Not included in scope of delivery, article 600 50 00

I

Valve locating screws set, 4-piece

Art. No. 609 64 50

J

Screws with washer (4 ea.)

M6 x 40

Component overview of cylinder head

Diagnostic system: reading out fault memory and activating systems

Disassembling cylinder head

486

Cylinder head components

Note

Reusable inner parts of the cylinder head must always be cleaned thoroughly and assigned to their original
installation location.

Item

Designation

Removal

Fitting

1

Cylinder head

A second person should help with

removing and positioning

Replacing cylinder-head

gasket; pay attention to the

dowel pins

2

Intake valve

Check tilt play of valve guide if

necessary; observe assignment.

Lightly oil valve stem

3

Valve stem seal

Use puller 3364

Replace; use 9606 assembly

driver

4

Lower valve-spring plate

(intake)

5

Valve spring set (intake)

6

Upper valve-spring plate

(intake)

7

Valve collets

8

Exhaust valve

Check tilt play of valve guide if

necessary; observe assignment.

Lightly oil valve stem

9

Lower valve-spring plate

(exhaust)

10

Valve spring (exhaust)

11

Upper valve-spring plate

(exhaust)

1. Remove spark plugs, if not already done.

Diagnostic system: reading out fault memory and activating systems

Disassembling cylinder head

487

Valve locating screws

2. Screw in the three valve locating screws -arrows- in the spark plug threads.

Mounting aluminium supports

Note

Put the screw clamps for fixing the cylinder head only on the aluminium supports, under no circumstances on
the sealing surface.

3. Align aluminium supports on the cylinder head with fastening screws. Fix cylinder head to the workbench

with screw clamps. Slide on assembly shaft with the joint to the aluminium supports and fasten them.

4. Screw lever arm on joint and the disassembly head on the lever arm.

5. Place disassembly head on upper valve-spring plate and press together the valve springs with the lever

arm. The valve keys and the concave washer stick due to the magnetic insert on the disassembly head.
Repeat this process by moving the joint at the required valves.

Pulling off the valve-stem seal (VW-special tool 3364)

6. Using the VW special tool puller 3364 pull off the valve-stem seal.

7. Check valve springs, valves, valve guides, and valve seats for damage.

8.

Diagnostic system: reading out fault memory and activating systems

Disassembling cylinder head

488