Contents: Removal ↓ Installation ↓
Note. The engine cylinder head can be removed from the car as an assembly or after partial disassembly - remove the camshafts. Both options are shown on the VAZ 21124 engine (1.6i). On the VAZ 2112 engine (1.6i), removing the cylinder head is performed similarly (see text for details).
Removal
1. Drain the coolant from the engine (see items 1-7 "Replacing the coolant").
2. Remove the rear timing belt cover (see "Rear timing belt cover - removal and installation").
3. Remove the head cover (see "Cylinder head cover - removal, installation, replacement").
Note: If the cylinder head is removed for subsequent repair, it is better to partially disassemble it before removal:
a) remove the camshafts (see "Camshafts - removal, installation, replacement");
b) remove the hydraulic compensators from their seats (see "Hydraulic compensators - removal, installation, replacement");
c) remove the fuel rail (see "Fuel rail engine 21124 (1.6i) - removal, installation, replacement");
d) remove the camshaft position sensor (see "Camshaft position sensor (CPS) - removal, inspection, replacement");
d) disconnect the upper power unit mounting rod from the engine bracket (see "Powertrain supports and rods - removal and installation").
If disassembling the cylinder head is not required (for example, to replace a gasket), it should be removed together with the camshafts, bearing housing, fuel rail, oil pressure and camshaft position sensors.
4. Disconnect the upper power unit mounting rod from the cylinder head bracket (see "Powertrain supports and rods - removal and installation").
5. Using a 13 mm socket wrench, unscrew the three nuts securing the rod bracket.
6. Remove the rod bracket from the studs.
7. On engine 21124 (1.6i) remove the catalytic manifold (see "Catalytic converter of the VAZ 21124 engine manifold (1.6i) - removal, installation, replacement").
On the 2112 engine (l,5i) remove the exhaust manifold (see "Exhaust manifold of VAZ 2112 engine (1.5i) - removal and installation") and the intake manifold (see "Intake manifold of the VAZ 2112 engine (1.5i) - removal and installation").
8. Using a 10 mm wrench, unscrew the bolt securing the ground wire tip and disconnect it from the cylinder head.
9. Using a 13 mm wrench, unscrew the nut securing the negative battery terminal wire tip and remove the tip from the stud.
10. To avoid damaging the sensor connectors, disconnect the wires from the engine management system coolant temperature sensors (see "Coolant Temperature Sensor (CTS) - Removal and Check") and temperature indicator (see item 3 "Coolant Temperature Gauge Sensor - Removal and Check"), as well as from the camshaft position sensor, if we remove the cylinder head assembly (see item 2 "Camshaft position sensor (CPS) - removal, inspection, replacement").
11. Using a 13 mm socket wrench, unscrew the two nuts securing the thermostat housing.
12. Remove the thermostat housing from the cylinder head studs and, without disconnecting the hoses, move it to the side.
13. Remove the thermostat sealing gasket.
14. Using a 10 mm Allen key, unscrew the ten bolts securing the head to the cylinder block in the specified sequence (see photo below).
15. Remove the head from the cylinder block as an assembly...
... or with the camshafts removed.
16. Remove the gasket:
17. To avoid losing them, remove the two guide bushings from their seats in the cylinder block.
Installation
1. We flush the cylinder head from dirt and deposits with kerosene or diesel fuel.
2. Remove from the threaded holes of the cylinder block (under the cylinder head mounting bolts) oil and coolant residues.
3. Clean the mating surfaces of the head and cylinder block from the remains of the old gasket, degrease the surfaces with a solvent.
(The original can be seen on the website: vazbook.ru)
Warning: Always use a new gasket when installing the cylinder head on the vehicle. Do not allow oil to come into contact with the gasket surface.
4. Install the cylinder head guide bushings into the cylinder block seats. Place the gasket on the cylinder block, and the guide bushings should enter the corresponding holes in the gasket.
5. Install the head on the cylinder block. Slightly moving the head from side to side, we ensure that the guide bushings enter the corresponding recesses of the cylinder head.
Warning: Re-use of head bolts is only permitted if their length does not exceed 100 mm.
6. Using a caliper or a bench ruler, measure the length of the cylinder head bolts. Replace bolts longer than 100 mm.
7. Before installation, dip the threaded portion of the bolts into engine oil, then let the oil drain, waiting about half an hour.
8. Install the head mounting bolts into the holes. Using a torque wrench, tighten the cylinder head mounting bolts in three steps: first to 20 N·m (2 kgf·m), then turn the bolts 90° further, and then turn the bolts 90° further again. In doing so, follow the sequence shown in the photo (see below).
We carry out further assembly of the engine in the reverse order.
Sequence of unscrewing cylinder head bolts
Cylinder Head Bolt Tightening Sequence.