Info

6 14

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Disassembling and Assembling Cylinder Head

Printed in Germany - III, 1989

911 Carrera 4 Engine, Cylinder Head, Valve Train

Note When:

No.

Description

Qty.

Removing

Installing

1

Cylinder head nut

24

Use screwdriver socket

Apply thin coat of Opti-

9295 for multi-tooth nuts

moly HT on cylinder

head nut bearing surface

2

Valve collet

24

3

Valve spring retainer

12

4

Valve spring, outer

12

5

Valve spring, inner

12

6

Intake valve

12

7

Valve stem seal

12

Replace, use plastic as

sembly sleeve

8

Valve spring ring

12

9

Washer

X

Determine thickness

with Special Tool P10c

10

Exhaust valve

12

11

Valve guide, intake

6

12

Valve guide, exhaust

6

13

Helicoil

6

14

Valve seat insert, intake

6

15

Valve seat insert, exhaust

6

Disassembling and Assembling Cylinder Head

Printed in Germany - III, 1989

Installing Information

321/15

Remove and install valve springs with P200a.

Checking Installed Length of Valve Springs

2. Read distance "A" on Special Tool P10c and, if necessary, correct by adding or removing shims.

319/15

Removing and Installing Valve Springs

Installing Information

323/15

Note

Check for perfect seating of spring retainer in the special tool, machining the special tool if necessary.

321/15

Remove and install valve springs with P200a.

Checking Installed Length of Valve Springs

1. Install Special Tool P10c with shims, spring ring, spring retainer and both collets belonging to a pertinent valve.

2. Read distance "A" on Special Tool P10c and, if necessary, correct by adding or removing shims.

319/15

Installed Distance

Installing Valve Springs

The coils of outer valve springs are wound progressively; the tighter wound coils must bear on the cylinder head. There is no special installed position for inner valve springs.

911 Carrera 4 Engine, Cylinder Head, Valve Train

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