Cylinder Head and Cover Assembly Overview
Cylinder Head and Cover Assembly Overview
1 Bolt, 10 Nm
2 Bracket
• For the fuel lines.
3 Bolt/Nut, 10 Nm
• With spacer sleeve and seal.
• Replace the seal if damaged.
4 Cap
• Replace the gaskets if damaged.
5 O-ring
• Replace if damaged.
• Lubricate before assembling.
• For the ignition coils with power output stages.
6 Cylinder Head Cover
• Removing and installing, refer to => [ Cylinder Head Cover ] Cylinder Head Cover.
• Replace if damaged.
7 Lifting Eye
8 Bolt, 23 Nm
9 Camshaft Roller Chain
• Mark the direction of rotation before removing (installed position). Refer to => [ Roller Chain, Marking ] Service and Repair.
• Installing, refer to => [ Valve Timing, Adjusting ] Adjustments.
10 Combination Valve
• Refer to => [ Secondary Air Injection System Components Assembly Overview ] Secondary Air Injection System Components Assembly Overview.
11 Camshaft Adjustment Valve 1 (N205)
• For the intake camshaft.
• Removing and installing, refer to => [ Camshaft Adjuster Valves ] Service and Repair.
• Before disconnecting, mark the allocation of the connector to the component.
12 Camshaft Adjustment Valve 1 (Exhaust) (N318)
• For the exhaust camshaft.
• Removing and installing, refer to => [ Camshaft Adjuster Valves ] Service and Repair.
• Before disconnecting, mark the allocation of the connector to the component.
13 O-ring
• For the oil channel seal.
• Always replace.
• Lubricate before assembling.
14 Camshaft Position (CMP) Sensor 2 (G163)
• For the exhaust camshaft.
• Before disconnecting, mark the allocation of the connector to the component.
15 Chain Tensioner, 40 Nm
• For the camshaft roller chain - item 9 -.
• Only rotate the engine with the chain tensioner installed.
16 Seal
• Replace if damaged or leaking.
17 Stud Bolt, 8 Nm
18 Seals
• For the camshaft adjustment valve 1, - item 11 - and the camshaft adjustment valve 1 (exhaust), - item 12 -.
• Replace if damaged or leaking.
• Installing, refer to => [ Timing Chain Cover Seal, Installing ] Timing Chain Cover Assembly Overview.
19 Coolant Thermostat Housing
• Assembly overview, refer to => [ Coolant Thermostat Housing Assembly Overview ] Service and Repair.
• Coolant hose connection diagram, refer to => [ Coolant Hose Connection Diagram ] [1][2]Diagrams.
20 Seal
• Always replace.
21 Camshaft Position (CMP) Sensor (G40)
• For the intake camshaft.
• Before disconnecting, mark the allocation of the connector to the component.
22 Timing Chain Cover
• Can be removed and installed with the engine installed.
• Assembly overview, refer to => [ Timing Chain Cover Assembly Overview ] Timing Chain Cover Assembly Overview.
• If only the cover has been removed, prepare the cylinder head gasket for installation. Refer to => [ Cylinder Head Gasket, Preparing for Assembly ] Cylinder Head.
• With the O-ring - item 13 - for the oil channel seal.
23 Bolt, 60 Nm + 90° (1/4) additional turn
• Always replace.
• The contact surface of the sensor wheel and the bolt head must be dry when installing.
• To remove and install, counter hold the camshaft using a 32 mm open end wrench. Refer to => [ Camshafts ] Service and Repair.
24 Exhaust Camshaft Adjuster
• Identification: 32A.
• Only rotate the engine with the camshaft adjuster installed.
• Installing, refer to => [ Valve Timing, Adjusting ] Adjustments.
25 Guide Rail
• For the camshaft roller chain - item 9 -.
• Clipped onto the control housing.
26 Intake Camshaft Adjuster
• Identification: 24E.
• Only rotate the engine with the camshaft adjuster installed.
• Installing, refer to => [ Valve Timing, Adjusting ] Adjustments.
27 Lifting Eye
28 Cylinder Head Gasket
• Metal gasket.
• Always replace.
• Prepare the cylinder head gasket for installation. Refer to => [ Cylinder Head Gasket, Preparing for Assembly ] Cylinder Head.
• After replacing, replace the coolant.
29 Cylinder Head
• Check for distortion, Refer to => [ Checking Cylinder Head for Distortion ].
• Removing and installing, refer to => [ Cylinder Head ] Cylinder Head.
• After replacing, replace the coolant.
30 Belt Tensioner
• For the ribbed belt.
• Removing and installing the ribbed belt. Refer to => [ Ribbed Belt ] Ribbed Belt.
31 Cylinder Head Bolt
• Always replace.
• Observe the installation instructions and sequence when loosening and tightening. Refer to => [ Cylinder Head ] Cylinder Head.
32 Cylinder Head Cover Gasket
• Replace if damaged or leaking.
• Note the installed position.
Checking Cylinder Head for Distortion
Special tools, testers and auxiliary items required
• Straight edge
• Feeler gauge
Max. permissible distortion: 0.05 mm.