Cylinder Head, Servicing

Cylinder head, servicing

Note:
^ If an exchange cylinder head is installed, all contact surfaces bearing elements, roller rocker fingers and cam running surfaces of camshaft must be oiled before installing cylinder head cover.
^ The plastic protectors fitted to protect the open valves must only be removed immediately before installing the cylinder head.
^ When replacing the cylinder head the entire coolant quantity must be replaced.
^ Removing and installing intake manifold, Refer to Timing Cover, Service and Repair.
^ Disassembling and assembling intake manifold
^ Removing and installing cover, Refer to Timing Cover, Service and Repair.
^ Checking compression pressure, Refer to Compression Test, Testing and Inspection

1. 8 Nm
2. Bracket
^ For fuel lines
3. Supporting frame
4. 8 Nm
^ With spacer sleeve and sealing ring
^ Replace sealing ring if damaged
5. O-ring
^ Replace if damaged
^ Lubricate before installing
^ For ignition coils with final output stage
6. Sealing cap
^ Replace seal if damaged
7. Boot
^ Replace if damaged
8. Cylinder head cover
^ Replace if damaged
9. Lifting eye
10. 23 Nm
11. Camshaft roller chain
^ Mark direction of rotation before removing (installation position), Refer to Engine, Service and Repair, Engine, disassembling and assembling
12. Combi-valve parts of the secondary air system
13. Valve 1 for camshaft adjustment-N205
^ For intake camshaft
^ Check camshaft timing adjustment, Refer to Timing Components, Adjustments
^ Mark connector and component before pulling connector off
^ Checking activation:
Refer to Powertrain Management; Output Diagnostic Test Mode
14. Camshaft adjustment valve 1 (exhaust) - N318
^ Check camshaft timing adjustment, Refer to Camshaft, Engine, Adjustments
^ Mark connector and component before pulling connector off.
^ Checking activation:
Refer to Powertrain Management; Output Diagnostic Test Mode
15. 60 Nm + 1/4 turn (90°) further
^ Replace
^ Contact surface of sensor wheel on bolt head must be dry for assembly
^ To remove and install, use a 32 mm open jaw wrench on camshaft to counter support, Refer to Camshaft, Engine, Service and Repair
16. Exhaust camshaft timing adjuster
^ Marking: 32A
^ Turn engine over only when camshaft timing adjuster is installed
^ Check camshaft timing adjustment, Refer to Camshaft, Engine, Adjustments
^ Installing, Refer to Timing Cover, Service and Repair
17. Slide rail
^ For camshaft roller chain item 11
^ Clipped into control housing
18. Intake camshaft timing adjuster
^ Marking: 24E
^ Turn engine over only when camshaft timing adjuster is installed
^ For air shrouding of injectors
20. Cylinder head gasket
^ Metal gasket
^ Replace
^ Preparing cylinder head gasket for installation, Refer to Fig 2
^ After replacement replace entire coolant
21. Cylinder head
^ Check for distortion, Refer to Fig 1
^ After replacement replace entire coolant
22. Tensioning element
^ For ribbed belt
23. Cylinder head bolt
^ Replace
^ Observe installation instructions and sequence when loosening and tightening, Refer to Cylinder Head, Service and Repair, Cylinder head, removing and installing
24. Cylinder head cover gasket
^ Replace if damaged or leaking
^ Observe installation position





Fig. 1 Checking cylinder head for distortion
Special tools and equipment
^ Straightedge
^ Feeler gauge
Max permissible distortion: 0.05 mm





Fig. 2 Preparing cylinder head gasket for installation
Special tools and equipment
^ AMV 174 004 01 Sealing compound
^ AMV 188 001 02 Sealing compound

Work sequence
- Clean old sealing compound from 3 mm holes in cylinder head gasket -arrows-.
- Fill 3 mm holes in cylinder head gasket with sealing compound AMV 174 004 01. Coat sealing surfaces on cover and seal flywheel/drive plate flange with sealing compound AMV 188 001 02. Install cover immediately.

Note: When the cylinder head is installed the holes in the cylinder head gasket are only half visible.