Repair of the cylinder head

Disassembly of the cylinder head is executed in the following order:

- Remove the cylinder head from the engine (see. Sect. 3.2.5);

- Unscrew the screws 6 (see. Fig. 3.44) fastenings of the bottom section of the intake manifold and remove the section 7;

- Unscrew the nuts 5 (see. Fig. 3.45) fastenings sections of the exhaust manifold and remove the section 4;

- Unscrew 4 screws (Fig. 3.47) fastening of asterisks of camshafts, keeping them from turning a wrench for them milled hexagon A and remove the sprocket 2;

- Unscrew the nuts bearing cap number 1 and 7 (Fig. 3.48) and remove the camshaft cover;

- Unscrew the nuts of bearing caps 3 and 5. The number must be nuts to turn on alternately crosswise in half a turn in one go, as long as they will not be able to turn away by hand;

- Remove the bearing cap number 3 and 5;

- Remove the camshaft valve drive cylinders number 1, 3 and 5;

- Unscrew the nuts bearing cap number 4 and remove the cover;

- Unscrew the nuts of bearing caps 2 and 6. The number must be nuts to turn on alternately crosswise in half a turn per pass as long as they will not be able to turn away by hand;

- Remove the bearing cap number 2 and 6;

- Remove the camshaft actuator valve cylinder number 2, 4 and 6;

- Remove the hydraulic tappets 5 (see. Fig. 3.47) from the cylinder head, put the pushers of the storage area in the order of removal for subsequent properly installed in its place;

- Compress the valve springs special device (see. Fig. 3.15) and remove the biscuits 6 (see. Fig. 3.47) valve;

- Remove the top plate 7 and springs 8 and 9 of the valve;

- Remove the valve 12 from the cylinder head from the combustion chamber;

- Remove the rest of the valve, clean the valve of a deposit with a wire brush, rinse them in kerosene and dry;

- Placed in a separate plastic bags with the valve mechanism and label packages to follow proper installation of valves on their seats;

- Remove the valve stem seals 10 with a special grip.

- Clean and blow compressed air all the fittings of the cylinder head;

- Clean and wash in kerosene crackers, spring and socket, then carefully dry them.

Recommendations for cleaning and washing the parts of the cylinder head shown in Sect. 3.1.7.

Operation fault detection camshafts and hydraulic tappets are described in Section. 3.1.5.

Fault detection of the cylinder head of the engine AAA is performed in the sequence described in Sect. 3.1.7.

Profiles valve seat shown in Fig. 3.49 and 3.50.

Minimum distance A (see. Fig. 3.19) from the end of the stem of the intake valve to the upper surface of the cylinder head is 33.9 mm, the exhaust valve - 34.1 mm.

Fault detection of parts of the valve mechanism is carried out in the sequence described in Section. 3.1.7.

The assembly of the cylinder head is executed in the following order:

- Assemble the valve mechanisms (see. Sect. 3.1.7);

- Establish pre-lubricated hydraulic tappets to their seats in the cylinder head;

- Lubricate the neck camshaft with clean engine oil and install the camshafts in the cylinder head;

- Turn the camshaft so that the cams of the valve cylinders number 1 and 2 have been directed upwards;

- Lubricate the running surfaces of bearing caps the camshaft with clean engine oil;

- Install bearing caps 3 and number 5 (see. Fig. 3.48);

- Tighten the nuts of bearing caps 3 and number 5 to 20 Nm, turning them every time alternately crosswise in half a turn;

- Install bearing cap number 1 and 7 and tighten the nuts of covers to 20 Nm;

- Install bearing cap number 2 and 6, and tighten the fastening of covers to 20 Nm, turning them alternately crosswise in half a turn per pass;

- Set the number 4 bearing cap and tighten the cap nuts to 20 Nm;

- Set 2 stars (see. Fig. 3.47) camshaft into place, tighten the mounting screws 4 stars torque of 100 Nm, while holding the camshafts from turning with a wrench;

- Apply a thin layer of sealant on the mating surface of the lid peeled 6 (see. Fig. 3.43), the timing and the cylinder head, replace the cover and tighten the 6 bolts fixing the cover 7;

- Set the ignition distributor;

- Complete the remaining operations in the reverse order of removal.