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Cylinder Head and Valves

If the engine frequently overheats, the likely could warp the cylinder head, check carefully for signs of deformation of the head.

Check

Before you make a conclusion about the need to reground parts required to complete all the testing procedures described below.

PERFORMANCE ORDER

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 deformation of a demountable plane of the cylinder head. 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 the normative, then replace the head. 3. Check the condition of the valve seats. In the presence of pitting (holes), cracks, traces of burnout need repair workshop Car head. Minor defects can be removed by lapping the valve. 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. 5. If the valve clearance in the sleeve significant, 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 is done in the studio Car). 6. If the guides will vary, the valve seat should be reground (or perezenkovat) only after pressing the new bushings.

VALVES

PERFORMANCE ORDER

1. Check on the valves of cracks, traces of burning, scuffing and shoulder, formed as a result of wear and tear on the rods. Turn the valve check the bend. Check the production ends. If you notice any signs of wear or damage, replace the valve. 2. 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 places, replace the valve. 3. If the state of the valve is satisfactory, they must grind the seats. If the saddle has only minor damage, or subjected to a saddle rounding, the grinding can be performed in the mist of the 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 saddles, saddle pads or replace (if provided). 4. Before grinding in the cylinder head on a flat surface, combustion chambers upwards. 5. Put on a saddle facet a thin layer of lapping compound. Grinding perform turning device 180 ?� in both directions, and occasionally lifting valve for uniform redistribution of an abrasive material. 6. Grinding on the rough part of education ends after monotone frosted girdle facets on the valve and seat. Clean the valve seat and 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. 7. After grinding in of all valves carefully wash all the parts with solvent.

Details of the valve mechanism