Cylinder Head, Remove and Install (X 16 SZR)
 Important! Only remove cylinder head when engine is cold - room temperature.
 Remove, Disconnect Remove lower coolant hose from radiator - collect escaping coolant. Remove upper coolant hose from thermostat housing. Remove all wiring harness plug and hose connections from intake manifold - see operation "Intake Manifold, Remove and Install (X 16 SZR)". Remove brace (1) and shackle (2) with wiring trough bracket. Disconnect spark plug connectors. Detach camshaft housing cover with wiring trough from camshaft housing. Detach front exhaust pipe (3) from exhaust manifold - see operation "Exhaust Manifold, Remove and Install". | 
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Remove, Disconnect Remove front toothed belt cover - see operation "Front Toothed Belt Cover, Remove and Install (X 16 SZR)".
 Adjust Screw fastening bolt for toothed belt drive gear into crankshaft and turn crankshaft slowly and smoothly in direction of engine rotation to 90 ° (dimension I) in front of TDC mark. Move toothed belt tension roller upwards against the spring force until the bore holes are aligned - secure toothed belt tension roller in place with suitable drift (1).
Remove, Disconnect Mark running direction of the toothed belt for identification and remove toothed belt. Remove camshaft sprocket - counterhold at hex of camshaft with an open-ended wrench. Remove rear toothed belt cover from camshaft housing. | 
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Remove, Disconnect Release cylinder head bolts in disassembly order shown, first 1/4 turn, then 1/2 turn, and remove. Remove camshaft housing from cylinder head. Remove rocker arms, thrust pieces and hydraulic valve lifters - note allocation. Remove cylinder head from cylinder block.
 Clean Remove gasket remnants. Clean sealing surfaces, bores and threads of cylinder head bolts. Notice: If the cylinder head is to be checked or modified, all the outer attaching parts must be removed from the cylinder head.
 Inspect Check cylinder head and cylinder block for plane surface - see operations "Cylinder Head, Check for Plane Surface" and "Cylinder Block, Check for Plane Surface".
 Install, Connect Position new cylinder head gasket with designation "OBEN/TOP" upwards and pointing to engine timing side. | 
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Install, Connect Place cylinder head on cylinder block. Insert hydraulic valve lifter, thrust pieces and cam followers lightly with MoS 2 lubricating paste (grey) - note allocation. Apply a bead of surface sealant (green) to the sealing surface of the cylinder head. Place camshaft housing on cylinder head. Attach cylinder head and camshaft housing to cylinder block with new fastening bolts. Tighten fastening bolts in installation order shown, use torque wrench and KM-470-B - tightening torque 25 Nm / 18 lbf. ft. + 60 ° + 60 ° + 60 ° . Attach front exhaust pipe to exhaust manifold - see operation "Exhaust Manifold, Remove and Install". Attach rear toothed belt cover to camshaft housing - 6 Nm / 4 lbf. ft. | 
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Install, Connect Attach camshaft sprocket to camshaft - counterhold with an open-ended wrench at camshaft hex - tightening torque 45 Nm / 33 lbf. ft. Attach camshaft housing cover with wiring trough to camshaft housing - tightening torque 8 Nm / 6 lbf. ft. Connect spark plug connectors. Attach support and shackle with wiring trough bracket to intake manifold and to alternator - tightening torque 20 Nm / 15 lbf. ft. Install toothed belt - see operation "Toothed Belt, Remove and Install (X 16 SZR)". Install all wiring harness plugs and hose connections at intake manifold - see operation "Intake Manifold, Remove and Install (X 16 SZR)". Attach upper coolant hose to thermostat housing. Attach lower coolant hose to radiator.
Inspect Top up cooling system - see operations "Cooling System, Top up and Bleed" and "Cooling System, Check for Leaks".
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