Before removing the head of the block, it is necessary to purchase a new gasket, a camshaft drive belt and, possibly, new cylinder head bolts. In addition, on the recommendation of Renault, the tension and bypass rollers must be replaced.
Withdrawal:
- disconnect the wire from the negative terminal of the battery;
- remove the hood;
- support the engine pan with a jack, placing a wooden spacer between them;
- remove the camshaft drive belt as described below;
- remove the protective casing of the engine tray and drain the coolant from the engine, as described in subsection «Cooling system»;
- drain the engine oil as described in subsection «Maintenance»;
- remove the throttle cable from the cylinder head;
- dismantle the protective casing of the fuel distribution rail;
Figure 3.12. Disconnecting pipelines from the fuel distribution rail: 1 - supply pipeline; 2 - return pipeline
- disconnect the pipelines from the fuel distribution rail (Figure 3.12) and take them aside;
Figure 3.13. Removing the air filter mount (1) and contact connector (2) at the front of the engine
- disconnect the electrical wires suitable for it from the cylinder head by disconnecting the corresponding connectors (Figure 3.13);
- remove the air filter housing, for which disconnect and set aside the expansion tank of the engine cooling system;
Figure 3.14. Engine Support Brace (arrow)
- remove the tie rod supporting the engine on the right side of the exhaust manifold (Figure 3.14);
- remove the fastening parts of the converter, separate it from the exhaust manifold and fix the converter on the pipeline of the exhaust gas system;
- remove the throttle body;
- remove the connector of the oxygen concentration sensor;
Figure 3.15. bolts (1) throttle body mounts, connector (2) exhaust gas oxygen concentration sensor, strut (3) engine mounts and lifting eye (4)
- remove the strut 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 bringing a screwdriver used as a lever
- unscrew the bolts securing the cylinder head cover, gradually loosening them, then separate the cover in a vertical direction, 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 so as not to damage the aluminum surfaces);
- remove the camshafts from the cylinder head. The intake shaft is marked «AM», high school graduation - «EAT». 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 (drawers, boxes) roller rocker arms so as not to confuse them during installation (Figure 3.18);
Figure 3.19. Removing hydraulic pushers
- take a metal box with 16 compartments and fill it with clean engine oil. Carefully, in order, remove the hydraulic pushers from the sockets (Figure 3.19) and arrange them in compartments, completely immersed in oil;
- remove the hoses on the thermostat unit located on the coolant outlet pipe from the cylinder head and the coolant temperature sensor connector;
Figure 3.20. Head Mount Holder (1) wiring harness and lifting eye (2)
- remove the fasteners of the harness holder at points 1 (Figure 3.20) and lifting eye 2;
- turn out the spark plugs;
Figure 3.21. Cylinder head bolt tightening sequence
- gradually loosening, turn away bolts of fastening of a head of the block of cylinders in an order, the return specified on the Figure 3.21;
- carefully with an assistant, remove the head from the cylinder block together with the gasket.
Before installing the cylinder head, carry out the following operations.
Cleaning
It is strictly forbidden to clean the mating surfaces of aluminum parts with a tool with a sharp edge.
Use Decapjoint, which dissolves the remnants of the gasket.
Apply the indicated agent to the surface to be cleaned, wait approximately 10 minutes, then remove the agent with a wooden spatula. Perform this operation with protective gloves. When performing this operation, take special precautions to prevent the entry of foreign particles into the channels for supplying pressurized oil to the rocker shafts (these channels are made in the cylinder block and in the block head).
Checking the mating surface
Using a straightedge and a set of feeler gauges, check the deformation of the mating surface. The maximum allowable 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 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 bolts. For the correct tightening of the bolts, use a syringe to remove the oil remaining in the mounting holes of the cylinder head for the mounting bolts. Do not lubricate new bolts with engine oil. On the other hand, reused bolts must always be lubricated with engine oil.