Attention! Wait until the engine has completely cooled down before starting work.
Withdrawal
1. Disconnect the negative cable from the battery.
Attention! If the stereo system installed in the car is equipped with a security code, before disconnecting the battery, make sure that you have the correct combination to activate the audio system!
2. Relieve pressure in the power supply system and disconnect the electrical wiring from the fuel injection injectors. Disconnect the fuel lines and remove the fuel lines (see chapter Power and exhaust systems).
3. Empty the cooling system, including the engine block (see chapter Settings and ongoing maintenance).
4. Remove the generator and ignition distributor (see chapter Engine electrical equipment).
5. Disconnect the ground bus from the wall of the power unit facing the timing belt.
6. Remove the steering pump (see chapter Suspension and steering) and without disconnecting the hoses, move it to the side.
7. Remove the upper inlet pipeline (see Section Removal and installation of the inlet pipeline).
8. Remove exhaust manifolds (see Section Removal and installation of exhaust manifolds).
9. Take off the timing belt and remove the timing gears (see Section Removing, checking the condition and installing the gas distribution belt and timing gears).
10. Remove the rear timing belt covers (see Section Removal, condition check and installation of camshafts).
11. Separate the coolant path assembly.
12. Remove rocker arm assemblies with axles (see Section Removal, condition check and installation of rocker arm assembly).
13. Socket wrench in several steps (1/4 turn per approach) loosen the cylinder head bolts enough to be able to turn them out by hand. Bolts should be loosened in the reverse order of tightening them.
14. Remove the cylinder head from the engine. If the head does not separate from the block, you can use the lever, which should be wound between the protrusions of the casting (never pry the head under the mating surface).
15. Acting in the same order (see paragraphs 12 to 14), remove the second head. Check the flatness of both heads.
Installation
1. Thoroughly clean the mating surfaces of the heads and cylinder block. After scraping off the remnants of the gasket material and carbon deposits, wipe the surfaces with a rag soaked in acetone. The presence of an old gasket on the mating surfaces of the material at the time of installation of the head can lead to a violation of the tightness of the gasket fit and, as a result, the development of leaks. When processing the block, plug the cylinder bores with rags to prevent small debris and various foreign objects from getting into them (as a last resort, vacuum the cylinders thoroughly).
2. Check the mating surfaces of the heads and block for deep scratches, nicks and other damage. Light defects can be removed with fine-grained sandpaper. In more serious cases, the only alternative is to re-groove or replace components.
3. With a tap of the appropriate size, drive the threaded holes for the head bolts. When finished, blow out the holes with compressed air. Alternately clamping the bolts in a vice by the head, go through their threads with a lerka - the presence of old sealant, dirt and corrosion products in the threads leads to a discrepancy between the actual tightening force of the fasteners and the indications of the torque wrench indicator.
Note. Remember to wear protective goggles when working with compressed air!
4. Thoroughly clean the oil spray nozzles, replace their sealing rings. Install new gaskets by sliding them over the oil nozzles and guide pins in the block.
5. Taking care not to dislodge the gasket, carefully place the head on the block.
6. Lubricate the threads and bottom surfaces of the heads of the mounting bolts with clean engine oil and screw the fasteners into place (do not forget to put special washers under the heads. Tighten the bolts by hand. Working in a strictly defined order, tighten the cylinder head bolts in three steps to the required torque (see Specifications).
Attention! All tightening steps must be repeated twice, i.e., after tightening the bolts with the force of the first stage, repeat the procedure (tightening them with the same force), only after that proceed to the second stage of tightening, etc.
7. In the same manner, install the second cylinder head on the engine.
8. Install the remaining components in the reverse order of their dismantling.
9. Don't forget to fill the cooling system and change the oil filter (see chapter Settings and ongoing maintenance).
10. Start the engine and check the correct ignition timing (see chapter Settings and ongoing maintenance). Run the engine for about five minutes at low speed to purge air from the valve clearance adjuster assemblies. Check that the unit is functioning properly.
Attention! In the first five minutes after the initial start, the valve train will operate with increased noise. If the noise level does not then decrease, this may indicate a defect in one of the valve clearance correctors.