Cleaning
1. Remove traces of the old gasket and sealant from the surface of the head. Remove scale from water channels. Clear all other channels. Clean the threaded holes with a wire brush and blow them out with compressed air.
2. Clean the cylinder head, rocker arms, springs, wave washers and rocker shafts, valve springs, valve seats, crackers and plates with solvent and dry them.
3. Remove deposits from the valves, then clean the valve heads and stems with a wire brush.
Inspection
Cylinder head
10.4 Check the surface of the head for deformation using a ruler and a set of feeler gauges
4. Inspect the head for cracks, leaks, or other damage. Using a ruler and feeler gauge, check the surface of the head for deformation (10.4).
5. Inspect the valve seats, if they are corroded, cracked or burnt, contact a specialist.
10.6 Use a dial gauge to measure the clearance between the valve stem and the guide sleeve
6. Check clearance between valves and guides by measuring valve stem travel with a dial gauge (10.6). When checking, the distance between the seat and the valve head should be approximately 1.5 mm.
Valves
10.7 Check the valve for wear in the indicated areas
A. New valve; b. Worn valve; 1. valve tip; 2. Groove; 3.Stem (least worn area); 4. Stem (most worn area); 5. Valve head; 6. Chamfer
7. Inspect the valve heads for wear, distortion, cracks, corrosion, and burnt areas. Check valve stem for nicks, cracks, or deformation (10.7). If they are present, replace the valve.
10.8 Valve face width should be as specified in the technical data section
8. Measure the width of the chamfer of the valves (10.8) and replace them if it is less than the minimum allowable.
Valve elements
10.9 Measure the free length of the valve spring
9. Inspect valve springs for wear and corrosion. Measure valve free length (10.9). Check spring resistance.
10.10 Check the springs for deformation
10. Place the spring on a flat surface and check for deformation (10.10).
11. Examine crackers and spring plates for cracks and signs of wear.
Rocker axis elements
12. See Chapter 2 Part A.
Dilution Inlet Valves
13. Check up ease of a course of all valves. Inspect the valve heads and seats for damage. Check the springs for deformation and cracks.
Valve repair
1. To replace the elements of the valves, their grinding and installation on the head, contact the specialists.