Cylinder Head Overview

Cylinder Head Overview





1 Cap

• Replace the seal if damaged.

2 Cylinder Head Cover

3 Bolt

• 10 Nm

• With a spacer sleeve and seal.

• Replace the seal if damaged.

4 Lifting Eye

• With the knock sensor connector retaining plate.

5 Bolt

• 23 Nm

6 Intake Manifold Support

7 Bolt

• 23 Nm

8 Bolt

• 10 Nm

9 Connecting Piece

• When changing from aluminum to plastic connecting pieces, pay attention to the bolt allocation. Refer to the parts catalog.

10 Gasket

• Replace

• Note the installed position.

11 Chain Tensioner

• 50 Nm

• For the camshaft timing chain.

• Only rotate the engine with the chain tensioner installed.

12 Seal

• Replace

13 Seal

• For the camshaft adjustment valve 1 (N205) and camshaft adjustment valve 1 (exhaust) (N318).

• Replace if damaged or leaking.

• Installing, refer to => [ Camshaft Timing Chain Cover Seals, Installing ] Service and Repair.

14 Timing Chain Cover

• Can be removed and installed with the engine installed.

• Apply sealant (D 176 501 A1) to the sealing surfaces.

15 Bracket

16 Bolt

• 8 Nm

17 Bolt

• 23 Nm

18 Guide Rail

• For the camshaft timing chain.

19 Bolt

• 23 Nm

• Install using locking fluid (D 000 600 A2).

20 Connecting Piece

• Bolted to the front of the cylinder head.

21 O-ring

• Replace

22 Seal

• Replace

23 Cylinder Head Gasket

• Metal

• Replace

• Replacing the cylinder head gasket, refer to => [ Cylinder Head ] Service and Repair.

• After replacing, replace the entire amount of coolant.

24 Cylinder Head

• Check for distortion.

• Removing and installing, refer to => [ Cylinder Head ] Service and Repair.

• After replacing, replace the entire amount of coolant.

25 Belt Tensioner

• For the ribbed belt.

• Removing and installing the ribbed belt. Refer to => [ Ribbed Belt ] Ribbed Belt.

26 Bolt

• Replace

• Before installing, apply locking compound (D 197 300 A2) to the bolts, refer to => [ Apply to each cylinder head bolt and the head
contact surface and install the bolts. ] Service and Repair

• Observe the installation instructions and sequence for loosening and tightening. Refer to => [ Cylinder Head ] Service and Repair.

27 Cylinder Head Cover Seal

• Replace if damaged or leaking.

• Note the installed position.

Checking Cylinder Head for Distortion





Special tools, testers and auxiliary items required

• Straight Edge 500 mm (VAS 6075)

• Feeler Gauge

Max. permissible distortion: 0.05 mm