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Kia Sportage>> The engine>> Petrol models>> Service of a head of cylinders and components газораспределительного the mechanism
Service of a head of cylinders and components газораспределительного the mechanism
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The given procedure is among those which performance does not demand removal of the engine from the car. |
Installation details, a design of a head of cylinders and the scheme of the organisation of a drive of valves are shown also on an illustration of the Detail of installation of the inlet pipeline and a final collector.
Design of a head of cylinders and the scheme of the organisation of a drive of valves
Dismantle and service of components
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Execute necessary preparatory procedures (see in Section of System of an electric equipment of the engine).
Remove газораспределительный a belt and components of drive ГРМ (Current leaving and service see the Head and Has undressed Removal and installation of components of drive ГРМ).
Preliminary having removed a thermofilter, turn out fixing bolts and separate a final collector from a head of cylinders and a reception pipe of system of release of the fulfilled gases.
Turn out fixing bolts and separate from a head of cylinders assemblage of the inlet pipeline.
Turn out fixing bolts and uncover heads of cylinders and a forward cover.
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Operating strictly in a certain order, in two-three receptions release bolts of fastening of a head of cylinders. Definitively turn out fixing bolts and remove a head, preliminary обстучав on perimetre of a joint with the block a hammer with soft the brisk. Remove a sealing lining of a head.
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Examine a head on presence of traces of development of leaks, cracks, cavities in interfaced surfaces and other mechanical damages. With the help щупа лезвийного type and a planeness measuring instrument (the steel ruler put on an edge) estimate degree of deformation of cylinders interfaced to the block (see an illustration an illustration), the inlet pipeline and a final collector of surfaces of a head. Compare results of measurements to requirements of Specifications of the Head the Engine. In case of need give a head in проточку (Specifications of the Head the Engine see), preliminary having checked up also size заглубления клапанных saddles and working backlashes in camshaft bearings.
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Operating strictly in a certain order, release bolts of fastening of covers of bearings of camshafts.
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Remove covers and take camshafts.
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Marking adjusting positions, take from a head of cylinders hydropushers of valves, - at installation pushers should be established strictly on the former places (if necessity for their replacement is absent). Examine pushers on presence of signs of deterioration and mechanical damages, defective components replace. If at сжимании pushers are displaced by fingers of section from each other, the pusher also is subject to replacement.
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Carefully wipe beds of bearings in a head and covers, then lay camshafts on the regular places and measure their sizes axial люфтов.
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By means of set Plastigage serially define sizes of working backlashes in camshaft bearings, - track correctness of an arrangement of covers and observance of requirements of Specifications of the Head the Engine to efforts of a tightening of their fixture.
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The tightening of bolts should be made in an order, the return to their order отпускания. |
Compare results of the made measurements to requirements of Specifications of the Head the Engine, in case of need replace a shaft and-or a head.
By means of special adaptations compress a spring of the first valve (see an illustration) and take from a flute on its core crackers of the cutting lock. Dismantle adaptations and take a spring with plates and the valve. Operating in a similar manner, remove components of the remained valves.
By means of special nippers remove маслоотражательные caps of directing plugs of valves (see an illustration).
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Capture of a cap by nippers is possible only after extraction of the bottom plate клапанной springs. |
Estimate a condition of the valves removed from the engine. In case of revealing of signs of deterioration, deformations and other mechanical damages of plates or cores replace defective components.
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Insignificant teases can be removed from surfaces of cores by means of a grinding stone. |
Make check of geometrical parametres of valves, - measure length of each valve from the flat party of a plate to a cut of a face part of a core, also measure a thickness of a cylindrical part (corbel) of a plate. Compare results of measurements to requirements of Specifications of the Head the Engine, defective valves replace.
Grease клапанное a saddle with a thin layer of lead minium and, without rotating, press to it a valve plate. Take the valve and on left on a surface of its working facet to a trace estimate density of its pressing to a saddle.
In case of infringement of uniformity of a stain of contact, or an exit of its width for limits of an admissible range (1.2 1.6 mm) the saddle should be прошлифовано a grinding nozzle for the purpose of removal задиров and agnails, or is subjected machining with application of special cutters with working corners in 15, 45, 35 or 75 degrees. During processing regularly repeat quality check прилегания the valve.
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If the contact ring on a facet of a plate of the valve is displaced upwards, the saddle is pierced with application of a cutter with a corner of a cone 75 ; at ring displacement downwards it is necessary to take advantage of cutters with a corner of a cone 35 (inlet valves)/15 (final valves), and 45 . |
Make grinding in of valves to saddles in a head of cylinders, - in quality притирочного means the abrasive paste which has been got mixed up in impellent oil is used special мелкодисперсная. Try not to admit mix hit on a valve core. After realisation of grinding in the contact stain should have the form of the continuous ring located in an average part of a working facet of a plate. From this point on each valve should be unequivocally adhered to the saddle, - the given fact should be taken into consideration at assemblage.
On size выступания cores of valves over a head surface define depth of landing of saddles. The rating value makes 36.36 37.27 mm. If the result of measurement lies within a range 37.27 37.97 mm, enclose under the bottom plate corresponding клапанной springs an equivalent washer. If depth of landing of the valve exceeds value of 37.97 mm, it is necessary to replace a head of cylinders.
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By means of a micrometer measure diameters of cores of valves at three levels. Results of measurements write down.
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With the help нутромера define internal diameters of directing plugs of valves.
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By subtraction of the maximum results of the first series of measurements from corresponding results of the second series define size люфтов landings of valves in directing plugs. Compare results of calculations to requirements of Specifications of the Head the Engine, in case of need replace directing plugs.
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Measure sizes выступания directing plugs over a head surface. Compare results of measurements to requirements of Specifications of the Head the Engine, in case of need make replacement of plugs.
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In case of need, slowly having warmed up a head to temperature 90С, by means of the special adaptation, operating from outside combustion chambers, beat out directing plugs from the landing nests in a head.
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Prepare replaceable plugs, - pay attention to distinctions in a design of directing plugs of inlet and final valves.
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Again having warmed up a head to temperature 90С, запрессуйте new directing plugs in reception nests on demanded depth.
Having finished installation of new directing plugs, repeat gauging люфтов landings in them of corresponding valves.
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Installation маслоотражательных caps should be made after end of adjustment of valves. |
Attentively study a condition клапанных springs, - in case of revealing having chopped off, cracks and other mechanical damages replace defective components.
Measure free length of springs, estimate infringement degree торцовки (illustrations see), - at excess by result of any of measurements of limiting admissible value (Specifications of the Head the Engine see) replace a corresponding spring ().
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Make measurement of height of cams of a camshaft, - if the result any makes of measurements less than the Head stipulated in Specifications the Engine of limiting admissible value, it is necessary to replace a shaft.
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Measure diameters подшипниковых necks, check up them on presence and ovality (see an illustration). Compare results of measurements to requirements of Specifications of the Head the Engine, in case of need replace a shaft.
Lay a shaft in prisms and by means of measuring instrument DTI check up it on bend presence (see an illustration). If the result of measurement exceeds limiting admissible value, replace a shaft.
Carefully smooth out interfaced surfaces of a head and the block of cylinders, clean carving apertures. Measure length of bolts of fastening of a head, compare results of measurements to requirements of Specifications of the Head the Engine, the extended bolts replace.
Assemblage is made as it should be the return to an order of dismantle of components (see also Has undressed Service of a head of cylinders and components газораспределительного the mechanism). At laying in a head of camshafts track, that they have been developed by adjusting pins of cogwheels upwards. Remember that клапанные components at assemblage should be established strictly on the former places. Do not forget to replace epiploons, sealing linings of surfaces of interface of a head with the block, a final collector and the inlet pipeline and other sealing elements (including a sealing ring of the gauge of position of a camshaft). The tightening of bolts of fastening of a head is made in two-three receptions in an order, the return shown with final effort 80 86 Nanometers, - before вворачиванием grease a carving part and the bottom party of heads of bolts with pure impellent oil. Before installation of a cover of a head of cylinders put on the shaded sites of a surface of a head hermetic, - the nominal effort of a tightening of bolts of a cover makes 4 6 Nanometers.
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