- Dismantle all procedures impeding the implementation components (see
the illustration Order of Dismantle of Components at removal of the power unit), - address materials of appropriate sections in this chapter, and also Heads of the Cooling system, heating, ventilation and air conditioning, the Power supply system, management of engine/decrease in toxicity of the fulfilled gases and production of the fulfilled gases and System of electric equipment of the engine.
- Take off a gas-distributing belt (see the Section Check of a State and Replacement of a Belt of the GRM Drive in the Head the Current leaving and service) and GRM drive components (see the Section Removal and installation of components of the GRM drive).
- Disconnect the inlet pipeline and a final collector from a head of cylinders.
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- Working strictly in a certain order, release bolts of fastening of a head of cylinders. Finally turn out fixing bolts and remove a head, previously having tapped on joint perimeter with the block the hammer with soft brisk. Remove sealing laying of a head.
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- Remove nozzles with toplivootvodny tubes (see Power supply systems, managements of engine/decrease in toxicity of the fulfilled gases and production of the fulfilled gases).
- Turn out and remove glow plugs, remove their electrical wiring (see the Head the Current leaving and service).
- Examine a head on existence of traces of development of leaks, cracks, cavities in the interfaced surfaces and other mechanical damages. By means of the probe of lezviyny type and the measuring instrument of planeness (the steel ruler put on an edge) estimate extent of deformation of the cylinders interfaced to the block, the inlet pipeline and a final collector of surfaces of a head. Compare results of measurements to requirements of Specifications of the Head Dvigatel. The defective head is subject to replacement.
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Restoration of planeness of the interfaced surfaces of a head of cylinders by their machining is not admissible at all! |
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- Working strictly in a certain order, release bolts of fastening of covers of bearings of the camshaft.
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- Uncover and take the camshaft.
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- Take pushers of valves with adjusting washers, - at assembly all components have to be installed strictly on the former places.
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- Carefully wipe beds of bearings in a head and covers, then lay the camshaft on the regular place and measure the size of its axial side play.
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- By means of the Plastigage set serially determine sizes of working gaps in camshaft bearings, - track correctness of an arrangement of covers observance of requirements of Specifications of the Head Dvigatel to efforts of tightening of their fixture.
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Tightening of bolts should be made as it should be, the return to an order of their otpuskaniye. |
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- At installation of covers during the procedure of measurement of gaps in bearings track correctness of their arrangement.
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- Compare results of the performed measurements to requirements of Specifications of the Head Dvigatel, in case of need replace a shaft and/or a head.
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- By means of the plunger dial measuring instrument (DTI) determine vystupaniye sizes over a landing head/depth surface in a head of inserts (1) of combustion chambers, - if the result any of measurements exceeds the limit of admissible range (see Specifications of the Head Dvigatel), replace inserts/head.
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- By means of special devices squeeze a spring of the first valve and take from a flute on its core crackers of the cutting lock. Dismantle devices and take a spring with plates and the valve. Working in a similar manner, remove components of the remained valves.
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- By means of special nippers remove maslootrazhatelny caps of the directing plugs of valves.
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Capture of a cap nippers is possible only after extraction of the lower plate of a valvate spring. |
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- In case of need, working from the back party of a head, by means of a suitable drift beat out inserts of combustion chambers, try not to lose the fixing balls.
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- By means of the probe of lezviyny type measure depth of landing of the valve in a head of cylinders. The nominal rate of depth of landing of valves (both inlet, and final) makes 0.75 ÷ 1.05 mm. If the result of measurement lies within the range of 1.55 ÷ of 2.55 mm, establish on a plate of a valvate spring an equivalent washer. If depth of landing of the valve exceeds value of 2.55 mm, the head of cylinders should be replaced.
- Estimate a condition of the valves removed from the engine. In case of identification of signs of wear, 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. |
- Grease a valvate saddle with a thin layer of lead minium and, without rotating, press to it a plate of the valve. Take the valve and on the mark left on a surface of its working facet estimate density of its pressing to a saddle.
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- In case of violation of uniformity of a spot of contact, or an exit of its width out of limits of admissible range (1.7 ÷ 2.3 mm) the saddle has to be proshlifovano a grinding nozzle for the purpose of removal of zadir and agnails, or is subjected to machining with application of special cutters with working corners in 15, 45 or 60 degrees. During processing regularly repeat quality check of a prileganiye of the valve.
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- Make grinding in of valves to saddles in a head of cylinders, - as pritirochny means the special fine abrasive paste mixed in motive oil is used. Try not to allow hits of mix on a valve core. After grinding in implementation the spot of contact has to have the form of the continuous ring located in a middle part of a working facet of a plate. From this point each valve has to be unambiguously tied to the saddle, - this fact has to be taken into account at assembly.
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- By means of a micrometer measure diameters of cores of valves. Write down results of measurements.
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- Having armed with a nutromer (1), measure internal diameters of the directing plugs of valves.
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- Determine by way of subtraction of results of the first series of measurements from the corresponding results of the second series the size of side plays of landing of valves in the directing plugs. Compare results of calculations to requirements of Specifications of the Head Dvigatel, in case of need replace the directing plugs.
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- By means of special adaptation beat out the directing plugs from the landing nests in a head opposite to the party of placement of combustion chambers aside.
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- Put a lock ring on the new directing plug and by means of special adaptation begin to knock the plug in a landing nest in a head, working from outside to the opposite side of placement of combustion chambers, - the lock ring has to disappear in a landing nest completely.
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Pay attention to constructive differences between the directing plugs of inlet and final valves. |
- Having finished installation of new guides of plugs, repeat measurement of side plays of landing in them the corresponding valves.
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Installation of maslootrazhatelny caps has to be made after completion of adjustment of valves. |
- Attentively study a condition of valvate springs, - in case of identification of chips, cracks and other mechanical damages replace defective components.
- Measure the free length of springs, estimate extent of violation of a tortsovka, - at excess by result of any of measurements of extreme admissible value (see Specifications of the Head Dvigatel) replace the corresponding spring(s).
- Measure outer diameters of pushers, write down results of measurements. If the result of measurement exceeds the limit of admissible range replace the corresponding component.
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- Measure internal diameters of nests (2) under landing of pushers (1) in casting of a head. Write down results. Determine by way of subtraction of results of the first measurements from results of the second sizes of landing side plays of pushers. Compare results of measurements to requirements of Specifications of Gdava Dvigatel, in case of need replace the corresponding pushers / a head of cylinders.
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- Perform measurement of height of cams of the camshaft, - if the result any of measurements makes less than the extreme admissible value stipulated in Specifications of the Head Dvigatel, the shaft should be replaced.
- Measure diameters of bearing necks, check them for existence and ovality. Compare results of measurements to requirements of Specifications of the Head Dvigatel, in case of need replace a shaft.
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- Lay a shaft in prisms and by means of the DTI measuring instrument check it for existence of a bend. If the result of measurement exceeds extreme admissible value, replace a shaft.
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