Carefully remove metal particles, emery residue and cloths.
If the piston for No. 1 cylinder is not at TDC:
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Turn crankshaft on the vibration damper securing bolt in direction of engine rotation to TDC No. 1 cylinder marking -arrow- while a second mechanic guides camshaft timing chain by hand.
Note
t
Do not remove new cylinder head gasket from its packing until immediately before installing.
t
Handle new gasket with extreme care. Damage will cause leakage.
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Apply a 2 mm thick bead of sealant -D 176 501 A1- onto joint between cylinder block and sealing flange as shown -arrows-.
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Immediately fit new cylinder head gasket. Inscription (Part No.) must be readable.
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Additionally insert a little sealant -D 176 501 A1- into the two 3 mm holes in the cylinder head gasket, which lie on the sealant bead.
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Ensure that dowel sleeves are inserted into cylinder block holes 12 and 20, and that cylinder head gasket is located.
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Position camshafts in cylinder head to TDC No. 1 cylinder.
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The camshaft bar -T10068 A- must engage in grooves in both shafts.
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Fit cylinder head, screw in new cylinder head bolts and tighten hand tight.
Note
The longer cylinder head bolts must be inserted in the centre holes of cylinder head.
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Tighten cylinder head bolts in tightening sequence shown working from inside to outside:
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Pre-tighten all bolts to 30 Nm.
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Then tighten all bolts to 50 Nm.
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Then tighten all bolts 1/4 turn (90°) further using a rigid wrench.
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Then tighten all bolts again 1/4 turn (90°) further.
Further assembly is basically the reverse of the dismantling sequence.
Note
Ensure that the O-ring for sealing the oil channel and the seal are fitted in the cover.
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Install camshaft adjuster with camshaft timing chain → Chapter.
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Install cylinder head cover and intake manifold → Chapter.