Before removing the cylinder head, it is necessary to purchase a new gasket, camshaft drive belt and, possibly, new cylinder head mounting bolts. In addition, according to Renault's recommendation, the tensioner and idler rollers must be replaced.
Removal:
- disconnect the negative battery cable;
- remove the hood;
- support the engine sump with a jack, placing a wooden spacer between them;
- remove the camshaft drive belt as described below;
- remove the engine sump guard and drain the engine coolant as described in subsection "Cooling system";
- drain the engine oil as described in the subsection "Maintenance";
- remove the throttle cable from the cylinder head;
- remove the protective cover of the fuel distribution rail;
Figure 3.12. Disconnecting the pipelines from the fuel distribution rail: 1 – supply pipeline; 2 – return pipeline
- disconnect the fuel lines from the fuel rail (Figure 3.12) and take them aside;
Figure 3.13. Disconnecting the air filter mount (1) and contact connector (2) at the front of the engine
- disconnect the electrical wires from the cylinder head by disconnecting the corresponding contact connectors (Figure 3.13);
- remove the air filter housing by disconnecting and moving aside the engine cooling system expansion tank;
Figure 3.14. Engine support brace (arrow)
- remove the tie rod holding the engine on the right side of the exhaust manifold (Figure 3.14);
- remove the fastening parts of the neutralizer, separate it from the exhaust manifold and secure the neutralizer to the exhaust system pipeline;
- remove the throttle body;
- remove the oxygen concentration sensor connector;
Figure 3.15. Bolts (1) for fastening the throttle body, connector (2) for the exhaust gas oxygen concentration sensor, brace (3) for fastening the engine and lifting eye (4)
- remove the brace and lifting eye (Figure 3.15);
- remove the exhaust manifold by disconnecting the vacuum hose from it;
- remove the ignition coils from the spark plugs (see subsection "Ignition system");
Figure 3.16. Oil separator on the cylinder head cover (arrow)
- remove the oil separator from the top of the cylinder head cover (Figure 3.16);
Figure 3.17. Removing the cylinder head cover: 1 – eyes; 2 – points for applying a screwdriver used as a lever
- loosen the cylinder head cover mounting bolts by gradually loosening them, then separate the cover in the vertical direction by hitting the lugs at points 1 (Figure 3.17) with a bronze drift and using a screwdriver as a lever at points 2 (wrap the screwdriver to avoid damaging aluminum surfaces);
- remove the camshafts from the cylinder head. The intake shaft is marked "AM", the exhaust shaft is marked "EM". If there is no marking, mark the shafts with paint;
Figure 3.18. Removing the roller rocker arms from the cylinder head
- remove and place in order in separate plastic cups (boxes, boxes) roller rocker arms to avoid confusion during installation (Figure 3.18);
Figure 3.19. Removing hydraulic tappets
- take a metal box with 16 compartments and fill it with clean motor oil. Carefully, in order, remove the hydraulic tappets from their sockets (Figure 3.19) and place them in compartments, completely immersing them in oil;
- remove the hoses on the thermostat block located on the coolant outlet pipe from the cylinder head and the coolant temperature sensor connector;
Figure 3.20. Fastenings on the cylinder head of the holder (1) of the wiring harness and the lifting eye (2)
- remove the wiring harness holder fasteners at points 1 (Figure 3.20) and lifting eye 2;
- remove the spark plugs;
Figure 3.21. Cylinder head bolt tightening sequence
- gradually loosening, unscrew the cylinder head mounting bolts in the reverse order to that shown in Figure 3.21;
- carefully, with the help of an assistant, remove the head from the cylinder block together with the gasket.
Before installing the cylinder head, perform the following operations.
Cleaning
It is strictly forbidden to clean the mating surfaces of aluminum parts with a tool with a sharp edge.
(Text of the original source on this website: renaultbook)
Use Decapjoint to dissolve any remaining pad residue.
Apply the specified product to the surface to be cleaned, wait for about 10 minutes, then remove the product with a wooden spatula. Wear protective gloves when performing this operation. When performing this operation, take special precautions to prevent foreign particles from entering the pressure oil supply channels to the rocker shafts (these channels are made in the cylinder block and in the cylinder head).
Checking the mating surface
Using a straightedge and a set of feeler gauges, check the deformation of the mating surface. The maximum permissible flatness is 0.05 mm. Grinding of the cylinder head is not allowed. Check the cylinder head for possible cracks. Check the condition of the cylinder head mounting bolts: the bolts can be reused if the length of the bolt shaft under the head does not exceed 117.7 mm. Otherwise, replace all the bolts. To properly tighten the bolts, remove any oil remaining in the cylinder head mounting holes under the mounting bolts with a syringe. Do not lubricate new bolts with engine oil. On the contrary, reused bolts must be lubricated with engine oil.