Dismantling and assembling chain housing with camshaft drive Cylinder bank

Before dismantling, set cylinder no. 1 of engine to firing TDC (corresponds to overlapping TDC of cylinder No. 4). Punch marks of both camshafts point up.

1115-15

911 Carrera 4 Engine, Crankshaft, Pistons

No.

Designation

Removal

Installation

1

Lock nut

2

2

Washer 6.4 x 14x3

2

3

Cover

1

4

Gasket

1

Replace

5

Chain tensioner

1

Oil feed bore points down; in addition, the spring retainers are marked with „top" and ,,RH bottom"

6

Hexagon head bolt M 6 x 18

4

7

Washer 6.4

4

8

Support bracket

1

When levering off, avoid damaging the guiding edges of the guide rail

9

Roll pin 10.5 x 43

1

Use mole wrench to pull out of chain housing

Check for correct seating in chain housing

10

Adapter sleeve 8x8

2

Check for correct seating in support bracket

11

Hexagon head bolt M 12 x 1.5 x 50

1

Apply a thin coat of Optimoly HT to threads, tighten to 120 Nm (88 ftlb), use wrench 9191 to lock

12

Washer

1

13

Roll pin

1

Use puller P 212 to pull out

14

Chain sprocket

1

Take off chain

Check teeth for wear, the deeper groove on the sprocket faces forward (towards flywheel)

15

Sprocket flange

1

16

Woodruff key

1

Lift out using diagonal-cutting pliers

No.

Designation

Removal

Installation

17

Shim

X

Measure dimensions, determine parallelity of sprockets; usually two washers are required (cylinders 4 to 6)

18

Thrust washer

1

Install in correct position, groove points towards camshaft

19

Hexagon head bolt or screw with captive spring washer

3

20

Washer A 6.4 (refer to No. 19)

3

21

End cover

1

22

O-ring

1

Replace, check seating area in chain housing and deburr edges if required, do not twist when fitting and keep greased along circumference

23

Gasket

1

Replace, apply a thin coat of Loctite 574 on both sides

24

Retaining pin

1

Tightening torque 31 Nm (23 ftlb)

25

Seal A 16 x 20

1

Replace

26

Guide rail

1

Guide rail must engage into groove of retaining pin with an audible click

27

Retaining pin

1

Tightening torque 31 Nm (23 ftlb)

28

Seal A 16 x 20

1

Replace

29

Tensioning rail

1

Tensioning rail must engage into groove of retaining pin with an audible click

30

Lock nut

5

No.

Designation

Removal

Installation

31

Washer 8.4 x 18 x 3

5

32

Chain housing (RH side)

1

Check seating area of O-ring (no. 22) and deburr if required

33

Gasket

1

Always replace with new part

34

Collar pin

9

Tightening torque 7 Nm (5 ftlb), bonded in place with Loctite 270

35

Stud 6 x 18

2

Bonded in place with Loctite 270

36

Lock nut

2

Replace if required

37

Washer 6.4 x 14 x 3

2

38

Flange (bridge)

1

39

Seal 6 x 25

1

Replace

40

Sleeve

1

41

Seal 6.7 x 3.53

2

Replace

42

Stud B M 6 x 20

1

Bonded in place with Loctite 270

911 Carrera 4

Engine, Cylinder Head, Valve drive

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