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| Unscrew bolts -arrows-. |
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| Unscrew cylinder head bolts using polydrive bit and socket -T10070- in sequence -1 … 5-. |
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| Make sure all hoses/pipes and wiring on component are removed. |
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| Ensure tensioning rail and guide rail are not damaged when lifting off cylinder head. |
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| Place cylinder head onto soft surface (foam plastic). |
Caution Avoid damage to sealing surfaces. |
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| Carefully remove sealant residue from cylinder head and cylinder block. |
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| Ensure that no long scores or scratches are made on the surfaces. |
Avoid damage to cylinder block. |
No oil or coolant must be allowed to remain in the blind holes for the cylinder head bolts in the cylinder block. |
Ensure that cylinder head gasket seals properly: |
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| Carefully remove remains of emery and abrasives. |
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| Do not remove new cylinder head gasket from packaging until it is ready to be fitted. |
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| Handle the cylinder head gasket very carefully to prevent damage to the silicone coating or the indented area of the gasket. |
Avoid damage to open valves. |
When installing an exchange cylinder head, the plastic protectors fitted to protect the open valves should not be removed until the cylinder head is ready to be fitted. |
Avoid damage to valves and piston crowns after working on valve gear. |
Turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is operated. |
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| Renew bolts tightened with specified tightening angle. |
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| Renew self-locking nuts as well as gaskets, seals and O-rings. |
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| When installing a replacement cylinder head, the contact surfaces between hydraulic compensation elements, roller rocker fingers and cams must be oiled before installing the camshafts. |
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| Hose connections and air duct pipes must be free of oil and grease before assembly. |
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| In order to be in a position to securely attach the charge air hoses on their connections, the worm screws of the used hose clips have to the sprayed with penetrating spray before installing. |
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| When cylinder head or cylinder head gasket is renewed, the entire coolant and the engine oil must be changed. |
Procedure for new cylinder head |
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