1.5 Checking compression

– Unscrew bolts -arrows- and remove heat shield -1-.

– Remove heat-shield sleeve

– Disconnect connector -arrow- for coolant temperature sender - G62- .

– Unscrew bolt -1- from engine support.

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– Loosen cylinder head bolts in the sequence -1 … 8-, and un‐screw them.

– Take off cylinder head and set it down on a soft surface (foam plastic). Installing

Note

♦ Risk of damage to sealing surfaces. ♦ Carefully remove sealant residue from cylinder head and cyl‐inder block.

♦ Ensure that no long scores or scratches are made on the sur‐faces, while doing so. ♦ Risk of 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. ♦ Risk of leaks in cylinder head gasket. ♦ Carefully remove remains of emery and abrasives. ♦ Do not remove new cylinder head gasket from packaging until it is ready to be fitted. ♦ Handle the cylinder head gasket very carefully to prevent damage to the silicone coating or the indented area of the gasket. ♦ If a further tightening angle is specified for certain bolts, these must be renewed.

♦ Renew self-locking nuts, seals, gaskets and O-rings. ♦ When installing a replacement cylinder head, the contact sur‐faces between hydraulic compensation elements, roller rocker fingers and running surface of cams must be oiled before in‐stalling the camshaft housing. ♦ Secure all hose connections with hose clips according to pro‐duction standard ⇒ Electronic Parts Catalogue . ♦ After fitting a new cylinder head or cylinder head gasket, change the coolant and engine oil.

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– Fit cylinder head gasket -1-. ♦ Pay attention to dowel sleeves -arrows- in cylinder block. ♦ Note the installation position of cylinder head gasket. Identifi‐cation: part No. -2- should be legible from inlet side. – If crankshaft has been rotated in the meantime: set No. 1 cyl‐inder piston to top dead centre and then turn crankshaft back slightly. – Fit cylinder head. – Insert and cylinder head bolts and tighten hand-tight. – Tighten bolts for cylinder head cover ⇒ page 159 .

Note

After repair work it is not necessary to retighten the cylinder head bolts.

Carry out the remaining installation in reverse sequence, noting the following: – Install turbocharger. ⇒ “1.2 Removing and installing turbocharger”, page 353 – Install camshaft housing ⇒ “1.4 Removing and installing camshaft housing”, page 166 . – Electrical connections and routing ⇒ Electrical system; Rep. gr. 97 ; Relay carriers, fuse carriers, electronics boxes; Over‐view of fitting locations - relay carriers, fuse carriers, electron‐ics boxes and ⇒ Current flow diagrams, Electrical fault finding and Fitting locations. Change engine oil ⇒ “1.2 Engine oil:”, page 237 . – Fill cooling system with fresh coolant ⇒ “1.3 Draining and adding coolant”, page 260 . Specified torques ♦ ⇒ “2.1 Assembly overview - assembly mountings”, page 67 ♦ ⇒ “1.1 Assembly overview - cylinder head”, page 158 ♦ ⇒ “1.1 Assembly overview - turbocharger”, page 351 ♦ ⇒ “4.1 Assembly overview - intake manifold”, page 399

1.4 Removing and installing camshaft hous‐ing

Special tools and workshop equipment required

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