Removal
1. Drain the coolant from the engine cooling system.
2. Drain the engine oil from the engine.
3. Remove the inlet hose and air filter.
4. Remove the exhaust pipe and catalytic converter.
5. Remove the timing belt.
Fig. 5.11. Connecting connectors and hoses to the cylinder head of the F9Q engine: 1 – fuel pump connector; 2 – pressure sensor connector; 3 – camshaft position sensor connector; 4 – fuel injector connector; 5 – glow plug connector; 6 – connection of vacuum hoses; 7 – brake booster hose connection; 8 – heater hose connections; 9 – EGR valve connector; 10 – coolant temperature sensor connector; 11 – connection of the return fuel hose; 12 – connection of the upper radiator hose; 13 – Cooling system hose connection; 14 – fuel supply hose connection; 15 – Engine temperature sensor connector
6. Disconnect the connectors of the camshaft position sensor 3 (Fig. 5.11), pressure sensor 2, fuel pump 1, engine temperature sensor 15, fuel injector 4, glow plug 5, coolant temperature sensor 10 and EGR valve 9.
7. Disconnect the vacuum hoses 6.
8. Loosen the clamp and disconnect the brake booster hose 7.
9. Loosen the clamp and disconnect the upper radiator hose 12.
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10. Loosen the clamp and disconnect the cooling system hose 13.
11. Loosen the clamps and disconnect the heater hoses 8.
12. Disconnect the fuel return hose 11.
13. Disconnect the fuel supply hose 14.
Fig. 5.12. Cylinder head gasket: a – lubrication point; 1 – sealing rings; 2 – return oil line tube; 3 – oil pipe; 4 – gasket; 5 – bolt, 10 Nm; 6 – cylinder head mounting bolt, 30 Nm + 100° ±4° + 0 Nm + 25 Nm + 213° ±7°;7 – cylinder head; 8 – cylinder head gasket
14. Unscrew and disconnect tube 3 (Fig. 5.12) of the oil line.
15. Unscrew and disconnect the return oil line pipe 2.
16. Remove gasket 4.
17. Remove the sealing rings 1.
Fig. 5.13. Sequence of unscrewing the cylinder head mounting bolts
18. Loosen the cylinder head mounting bolts in 2 or 3 stages in the sequence shown in Fig. 5.13, then remove the cylinder head assembly.
19. Carefully remove the cylinder head assembly.
20. Remove the cylinder head gasket.
Preparing for installation
1. The mating surfaces of the cylinder head and block must be completely clean. Use a hard plastic or wooden scraper to clean them. Be careful when cleaning, as the aluminum alloy is very easy to damage. Check that carbon deposits do not get into the oil and water channels. This is especially important for the lubrication system, as carbon deposits can block the oil supply to the engine components. Clean the channels if necessary.
4. Clean the bolt holes in the block. Driving a bolt into an oil-filled hole can cause the block to burst due to hydraulic pressure.
Installation
Installation is carried out in the reverse order of removal, taking into account the following.
1. Degrease the mating surfaces of the gasket.
2. Install the cylinder head gasket and check that all holes in the gasket and cylinder block are aligned.
3. Use only new cylinder head bolts.
4. Before installing the bolts and washers, lubricate the threaded parts of the bolts and the surfaces of the washers with a small amount of engine oil.
Fig. 5.14. Sequence of tightening the cylinder head bolts: 1 – key МВ991614 for screwing in bolts to the required angle
5. Tighten the cylinder head bolts in several stages in the sequence shown in Fig. 5.14.
Bolt tightening steps:
- 1st - tighten to 30 Nm;
- 2nd – tighten to an angle of 100° ±4°;
- 3rd - wait at least 3 minutes;
- 4th - loosen bolts 1 and 2;
- 5th – tighten bolts 1 and 2 to 25 Nm;
- 6th – tighten the bolts to an angle of 213° ±7°;
- 7th – Divide the remaining bolts into pairs 3 and 4, 5 and 6, 7 and 8, 9 and 10 and tighten them in pairs according to steps 3, 4 and 5.