If a leak of engine oil or coolant is detected at the junction of the block head with the cylinder block, remove the head and replace its gasket.
A leak can also occur due to warping of the block head due to overheating.
1. Reduce the pressure in the supply system (see «Reducing the pressure in the power system»).
2. Disconnect the wire from the terminal «minus» battery.
3. Drain the liquid from the cooling system (see «Coolant replacement»).
4. Remove the air filter (see «Removal and installation of the air filter and an air duct»).
5. Press the latch and disconnect the wiring harness connector from the exhaust camshaft variable valve timing system.
6. Disconnect the wiring harness connector from the intake camshaft valve in the same way.
7. Remove the timing belt from the camshaft pulleys (see «Replacing the timing belt»).
8. Press the latch and disconnect the wiring harness block from the thermostat heating element.
9. Turn away a nut of fastening of an arm of a motor plait of wires, remove an arm from a hairpin and take a plait of wires aside.
10. Disconnect the wiring harness connectors from the exhaust camshaft position sensor A and from the intake camshaft position sensor B.
11. Disconnect the wiring harness connectors from the fuel injectors.
12. Turn out a bolt of fastening of a tip of a wire «minus» to the cylinder head and move the tip to the side.
13. Press a clamp and disconnect a block of a plait of wires from the gauge of temperature of a cooling liquid.
14. Loosen the clamp that secures the hose to the thermostat fitting and disconnect the hose from the fitting.
15. Loosen the brake booster vacuum hose clamp by squeezing its bent antennae with pliers. Slide the clamp over the hose and disconnect the hose from the inlet pipe fitting.
16. Squeeze the retainer and disconnect the tip of the throttle assembly heating hose from the water distributor fitting.
17. Loosen the heater hose clamps by squeezing their bent antennae with pliers. Slide the clamps over the hoses and disconnect the hoses.
18. Remove the collector (cm «Removal and installation of the collector, replacement of its gasket»).
19. Remove camshafts (see «Removal, troubleshooting and installation of camshafts»).
20. Turn out two bolts of fastening of a water distribution pipe to the water pump...
21.... a bolt of fastening of a water distribution pipe to the block of cylinders...
22.... two bolts securing the pipe to the thermostat module...
23.... and remove the water distribution pipe.
WARNING: The water distribution pipe flanges are sealed with rubber rings. Replace the rings every time the joints are disassembled.
24. Slide the thermal screen along the wiring harness, press the retainer of the wiring harness block...
25.... and disconnect the block from the oil pressure sensor.
26. Disconnect the plastic holders of the engine wiring harness from the engine brackets by biting them with pliers, and remove the wiring harness from the engine compartment.
27. Loosen the ten bolts securing the head to the cylinder block in the sequence shown in fig. 5.3 and turn them inside out.
WARNING: The cylinder head bolts must only be removed when the engine is cold.
28. Remove the cylinder head assembly with the intake pipe.
GOOD ADVICE: Remove the cylinder head with an assistant, as it is quite heavy.
29. Remove the head gasket.
30. Clean the mating surfaces of the head and cylinder block from oxides and residues of the old gasket.
31. Check the block head for warping. To do this, placing the ruler with an edge on the surface of the head, first in the middle along, then across and diagonally, measure the gap between the surface of the head and the ruler with a feeler gauge. Grind the cylinder head if the clearance is greater than 0.1 mm.
32. Install the cylinder head in the reverse order of removal, taking into account the following:
- remove oil and coolant from the threaded holes of the cylinder head bolts that got there when the head was removed;
- be sure to install a new head gasket, its reuse is not allowed;
- lubricate the bolts with engine oil;
- tighten the bolts on a cold engine in the order shown in fig. 5.4, with the moment specified in Appendix 1.
33. Establish camshafts in the sequence specified in subsection «Removal, troubleshooting and installation of camshafts».
34. Install all previously removed parts in the reverse order of removal.