Cylinder head of engines 2112 and 21124 (16v) — removal and installation (VAZ-2112)

Note: The engine cylinder head can be removed as an assembly or after partial disassembly (remove camshafts). Both options are shown on the 21124 engine (1.6i). On the 2112 engine (1.5i) the work is performed similarly (see text for details).

Removal

1. Drain the coolant from the engine (see "Coolant - replacement").

2. Remove the rear timing belt cover (see "Camshafts of engines 2112 and 21124 (16v) - removal and installation").

3. Remove the cylinder head cover (see "Cylinder head cover for engines 2112 and 21124 (16v) - removal and installation").

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 of engines 2112 and 21124 (16V) removal and installation");
• b) remove the hydraulic tappets from their seats (see "Hydraulic valve lifters for engines 2112 and 21124 (16V) removal and installation");
• c) remove the fuel rail (see "Fuel rail engine 2112 (1.5i 16V) - removal, disassembly, assembly and installation", or "Fuel rail engine 21124 (1.6 16V) - removal, disassembly, assembly and installation");
• d) remove the camshaft position sensor (see "Camshaft Position Sensor - Checking and Replacing");
• d) disconnect the upper power unit mounting rod from the engine bracket (see "Upper mounting rod for engines 2112 and 21124 (16v)").

If disassembling the cylinder head is not required (for example, to replace the cylinder head 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 "Upper mounting rod for engines 2112 and 21124 (16v)").

5. With a socket wrench by 13 mm we unscrew the three nuts securing the rod bracket.



6. Remove the bracket from the studs.



7. On engine 21124 remove the exhaust manifold (see "Exhaust manifold of engine 21124 (1.6i 16v) - removal and installation, gasket replacement"). On engine 2112 remove the exhaust manifold (see "Exhaust manifold of engine 2112 (,5i 16V) - removal and installation, replacement of gasket") and the intake manifold (see "Engine intake manifold 2112 (1.5i 16v) - removal and installation, gasket replacement").

8. Key by 10 mm we unscrew the bolt securing the ground wire tip and disconnect it from the cylinder head.




9. Key by 13 mm we 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 - Checking and Replacing") and from the temperature indicator (see "Coolant Temperature Gauge Sensor - Checking and Replacing"), and also from the camshaft position sensor if we remove the cylinder head assembly (see "Camshaft Position Sensor - Checking and Replacing").

11. With a socket wrench by 13 mm we 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 sealing gasket.



(The information is posted on the portal VAZbook.ru)

14. With a hex key by 10 mm we unscrew the ten bolts that secure the head to the cylinder block in the indicated sequence.



15. Remove the head from the cylinder block as an assembly...



... or with the camshafts removed.



16. Remove the cylinder head 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.

Warning! Always use a new gasket when installing the cylinder head. Do not allow oil to come into contact with the gasket surface

4. Install the head guide bushings into the cylinder block seats. Place the gasket on the cylinder block, and the guide bushings should fit into 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 head.

Warning! Reuse of cylinder head bolts is only permitted if their length does not exceed 100 mm

6. Using a caliper or a mechanic's ruler, measure the length of the bolts. Replace bolts longer than 100 mm.

7. Before installation, dip the threaded portion of the bolts in engine oil and let the oil drain, waiting about half an hour.



8. Install the head mounting bolts into the holes. Using a torque wrench, tighten the head mounting bolts in three steps - first with a torque of 20 N·m (2 kgf·m), then turn the bolts 90° further, and then turn the bolts 90° further again. In doing so, observe the sequence shown in the photo.



We carry out further assembly of the engine in the reverse order.