Checking and repairing the cylinder head (Escort 4)

These procedures are performed after disassembling the cylinder head. Before checking, it is necessary to clean and thoroughly blow out with compressed air all parts.

Caution! Do not use tools that may scratch the parts being cleaned.

1. Using a ruler, check the flatness of the lower surface of the cylinder head along, across and diagonally.

2. Check the condition of the valve guide bushings.

3. Check the condition of the valve seats.

4. Check the condition of the valve lever axle and the surface of the levers in contact with the ends of the valve stems for wear and the presence of scratches and grooves.

5. Check the condition of the valve springs. The springs must be replaced after 80,000 km of vehicle mileage.

Checking the valve guides

6. Worn valve guides do not ensure coaxial installation of the valves in the seats, which leads to a significant increase in fuel and oil consumption.



7. Insert the valve into the guide bushing and, moving the valve in the transverse direction, check the clearance.



8. If the clearance exceeds the permissible norms, it is necessary to process the guide bushing using the appropriate reamer to the nearest increased size. The processing of the guide bushing must begin from the combustion chamber side.

Processing of valve seats in the cylinder head

9. Valve seats with signs of wear or burning must be processed with mandatory preservation of the angles and size of the chamfer. Otherwise, it is necessary to replace the cylinder head. After any processing of the valve seats, it is necessary to grind the valves.

Lapping valves

10. Lapping of the machined valve seats. Lapping of the valves must be done using only fine-grained polishing paste.

11. Lubricate the surface of the valve seat with a small amount of paste and install the valve in the corresponding seat. Press the rubber suction cup tightly to the valve plate and rotate the valve in one direction or the other.

12. After finishing the grinding process, thoroughly clean all parts from dirt and paste and check the valve seat and plate. A solid matte ring should be visible on both parts, which indicates the width of the valve chamfer.



13. Apply pencil strokes on the valve plate ring at a distance of approximately 1 mm evenly around the circumference, then insert the valve into the guide sleeve and turn it 90°, while lightly pressing on the valve.



14. Remove the valve and check for any marks. If all marks are erased, the valve can be finally installed. Otherwise, the grinding operation must be repeated.

Valve actuator lever mechanism

15. Remove the cotter pin, retaining plate and washer from one side of the axle. Remove the levers, support posts and springs from the axle in sequence, preserving their location for subsequent assembly in the same order in which they were removed.

16. Clean the oil supply holes.

17. Before assembly, lubricate the axle with oil.



18. The chamfer on the end of the axle should be on the side of the valve clearance adjustment bolts, which ensures normal lubrication of the rubbing parts of the lever mechanism.