Contents: Cleaning ⤓ Inspection ⤓ Cylinder head ⤓ Valves ⤓ Valve elements ⤓ Rocker arm axle elements ⤓ Rarefied mixture intake valves ⤓ Valve repair ⤓
Cleaning
1. Remove traces of old gasket and sealant from the surface of the head. Remove scale from the water channels. Clean 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 arm shafts, valve springs, valve seats, crackers and plates with solvent and dry them.
3. Clean any deposits from the valves, then clean the valve heads and stems with a wire brush.
Inspection
Cylinder head
10.4 Check the head surface for deformation using a ruler and a set of feeler gauges
4. Inspect the head for cracks, leaks and other damage. Use a ruler and feeler gauge to check the head surface 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 bushing
6. Check the clearance between the valves and the guide bushings by measuring the valve stem stroke using a dial gauge (10.6). When checking, the distance between the valve seat and the valve head should be approximately 1.5 mm.
Valves
10.7 Check the valve for wear in the areas indicated
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, warping, cracks, corrosion and burnt areas. Inspect the valve stem for nicks, cracks or warping (10.7). If present, replace the valve.
10.8 The valve chamfer width shall be as specified in the technical specifications section
8. Measure the valve chamfer width (10.8) and replace them if it is less than the minimum permissible value.
Valve elements
10.9 Measure the free length of the valve spring
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9. Inspect the valve springs for wear and corrosion. Measure the valve free length (10.9). Check the spring resistance.
10.10 Check the springs for deformation
10. Place the spring on a flat surface and check it for deformation (10.10).
11. Inspect the spring crackers and plates for cracks and signs of wear.
Rocker arm axle elements
12. Look Chapter 2 Part A.
Rarefied mixture intake valves
13. Check the ease of movement of all valves. Inspect the heads and valve seats for damage. Check the springs for deformation and cracks.
Valve repair
1. To replace valve elements, grind them in and install them on the head, contact specialists.