| Cylinder head |
| 1. Carefully examine a head, check up presence of cracks, traces of penetration of coolant or other damage. If cracks are found, replace the cylinder head. |
 | 2. Check the deviation of the split surface of the cylinder head from the plane with a feeler gauge and the gauge bar. If detected bending the split plane, the head should be abraded. If the deformation of a demountable plane is such that the height of the head after grinding will be less than specified in sub-section 3.2.1.1, replace the head. |
| 3. Check the condition of the valve seats in each combustion chamber. In the presence of pitting (holes), cracks, traces of burnout need repair workshop Car head. Minor defects can be removed by lapping the valve to the seat on the fine composition. |
| 4. Check the wear guides. To do this, insert the valve into the corresponding guide tube and shake from side to side. Valid is a small, barely noticeable backlash. If the play in the sleeve valve significantly, measure the diameter of the valve. If the diameter of the valve significantly reduced due to wear, replace the valve. If the diameter of the valve stem is correct, replace the guide bush. This work is best done in the workshop of car-care center, or have a qualified mechanic. |
| 5. If the guides will vary, the valve seat should be reground (or perezenkovat) only after pressing the new bushings. |
| Valves |
| 6. Carefully inspect each valve head check for cracks, wear and traces of burning. Check the valve stem scuffing and shoulder, formed as a result of wear and tear. Turn the valve check the bend. Test production at the ends of the valve stem. If you notice any signs of wear or damage, replace the valve. |
 | 7. If the result of this review, it appears that the state of the valve is satisfactory, then measure the diameter of the valve in several places. A notable difference indicates the diameter of the valve stem wear. If you find a significant difference in diameters of at least two locations valve (or valves), replace. |
| 8. If the condition of the valve is satisfactory, they must grind the seats in order to ensure sealing contact, eliminating blow-by. If the saddle has only minor damage, or subjected to a saddle rounding, the grinding can be performed on the fine abrasive composition. Coarse lapping composition should be used only in case of detection of traces of deep development or strong burning saddles. In this case, the cylinder head and valves should be returned to check experienced to determine whether perezenkovat saddle, or even replace the inserts seats (if equipped). |
| 9. Lapping valves as follows. The cylinder head on a flat surface so that the combustion chambers are facing upwards. |
| 10. Put on a saddle facet a thin layer of lapping compound (the corresponding dispersion) and press the suction cup device for lapping the valve to the valve head. |
 | 11. Grinding perform turning device 180 ?� in both directions. In the process of lapping occasionally lift the valve for the uniform redistribution of an abrasive material. Lapping greatly facilitated if a valve head is not very tough to put a spring. |
| 12. Grinding on the rough abrasive composition should be completed after the formation of monotonous frosted girdle facets on the valve seat, and then wipe the valve seat from the remnants of paste and continue grinding to fine particulate composition. Lapping is considered completed the formation on the valve face and seat belt continuous uniform gray color. Further grinding is not allowed because of excessive production of saddle its subsequent repair may be impossible. |
| 13. After grinding in of all valves, remove the abrasive residue, carefully clean all parts with kerosene or solvent. |
| Details of the valve mechanism |
| 14. Check on springs traces of chipping and damage. The manufacturer recommends to verify the valve springs by measuring the force which causes compression of the spring to a certain length. This method is possible only with special equipment. Therefore, testing should be performed in the spring service Car Dealer. A rough check of a condition of the spring can be made by comparing the length of the spring in the free state with specified in subsection 3.2.1.1. |
| 15. Place each spring on a flat surface and place the next square. Measure the distance between the coil spring and square at the top and compare with the value specified in Section 3.2.1.1. |
| 16. If at least one of the springs is damaged, has a higher deviation from the vertical, or has lost elasticity, replace all the springs in the kit. Generally during overhaul of the valve springs recommended to change, regardless of their status. |
| 17. The valve stem seals are changing, regardless of their status. |
If the engine frequently overheats, the likely could warp the cylinder head, check carefully for signs of deformation of the head. 
