Cylinder head (Renault Espace III)

Removal

• Removal of the cylinder head must be carried out on the engine removed from the vehicle.
• Remove the cap from the oil filler neck.
• Remove the timing belt of the gas distribution mechanism drive.
• Remove the power steering fluid reservoir mounting bolt and move it to the side.
• Remove the plastic shield protecting the wiring harness from the intake manifold.
• Remove the EGR capsule and its pipe.
• Remove the intake manifold mounting bolts.
• Raise the manifold slightly and remove the two screws securing the crankcase ventilation hose, which is secured under the manifold.
• Remove the intake manifold and its gasket.
• Remove the two bolts securing the cooling system pipe to the cylinder head on the flywheel side.
• Remove the turbocharger heat shield.
• Loosen the oil vapor separation tank mounting bolts and move it to the side.
• Remove the engine oil inlet and outlet pipes and the cooled support from the turbocharger.
• Remove the turbocharger support eyes and disconnect the air pipes from the turbocharger.
• Disconnect the flexible cooling system hose, cables and electrical connectors from the cylinder head.
• Using the special Renault Mot. 1383 key, disconnect and remove the high pressure pipes.
• Remove the fuel injectors.
• Remove the thermal protection washers and injector sealing rings.
• Remove the cylinder head cover and its gasket.
• Remove the cylinder head mounting bolts.
• Remove the cylinder head and gasket.

Installation

• Clean the cylinder head surface, being careful not to scratch the aluminum alloy the cylinder head is made of. Use Decapjoint solvent to remove any stuck gasket parts.
• Clean the cylinder block surface that meets the cylinder head gasket.
• Check for the presence of bushings centering the head on the cylinder block.

Fig. 3.48. Location of the bolts securing the cooling system pipe to the cylinder head

Fig. 3.49. Location of oil vapor separation tank mounting bolts

• Check the smooth rotation of the camshaft
• Install the new cylinder head gasket, centering it on the guide bushings.
• Lubricate the threads, base of the bolt heads and washers with engine oil.

Note: New bolts must be used to secure the cylinder head. Check that the cylinder head bolt holes in the cylinder block are clean and free of oil

• Install the cylinder head mounting bolts and tighten them in the sequence shown in Figure 3.52
• Install the cylinder head cover with the gasket and secure with bolts, tightening them to the required torque.
• Fix the camshaft in the valve timing position.
• Install a new thermal protection insert and o-ring for each injector (fig. 3.13).
• Install the injectors.
• Install and tighten the high pressure pipes using the special Renault Mot. 1383 key.

Fig. 3.50. Cylinder head: 1 - oil filler cap; 2 - oil filler neck channel; 3 - cylinder head cover; 4 - cylinder head cover gasket; 5 - cylinder head mounting bolt; 6 - camshaft bearing cap; 7 - oil deflector cap; 8 - oil seal; 9 - bracket; 10 - cylinder head; 11 - plug; 12 - preliminary combustion chamber

Fig. 3.51. Installing the cylinder head gasket with its centering on the guide bushings

• Connect the flexible cooling system hose, cables and electrical connectors to the cylinder head.
• Install the turbocharger support lugs and connect the air ducts to it
• Connect the lubrication lines to the turbocharger bearings
• Secure the oil vapor separation tank with bolts
• Install the turbocharger heat shield and secure with bolts, tightening them to the required torque.
• Install the intake manifold so as to press the crankcase ventilation pipe.
• Install the intake manifold with a new gasket and secure with nuts, tightening them to the required torque.
• Install the EGR capsule together with its pipe.
• Install the plastic shield to protect the wiring harness on the intake manifold.
• Install and bolt the power steering fluid reservoir.
• Install the timing belt and valve timing.
• Install the oil filler neck channel.