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2. Cautiously move apart the lock top компрессионного rings and remove it from the piston at the top. Operating in a similar manner, remove remained the second компрессионное a ring, then маслосъемное. That in the course of ring removal did not fail in located above a flute, take advantage of pair old лезвийных probeов. Try not to scratch rings a piston surface. Remember that rings are made of enough fragile material and at excessive expansion can break. Do not forget that about keen edges of piston rings it is easy to cut fingers. Pay attention to that fact that маслосъемное the ring consists of three separate parts - a dilator and two lateral sections. All rings should act in film at the top the piston. If old rings are in good repair and are subject to the further use, at assemblage they should be established strictly on the former places. Release from rings pistons of all assemblages. |
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3. Cautiously scratch out coal adjournment from the top part of pistons. After the basic layer of adjournment will be removed, it is possible to take advantage of a manual wire brush, or an emery paper. Try not to mention during cleaning piston metal as it can be easily damaged in view of the softness.
4. A fragment of an old ring clean piston flutes, having removed from them accumulated coal adjournment. Be careful, try not to damage walls and a bottom of flutes. Do not cut fingers.
5. Having finished clearing procedure, wash out pistons and rods in kerosene or other suitable solvent, then carefully dry. Make sure of passableness масловозвратных apertures in flutes under installation of piston rings.
6. If walls of pistons and a mirror of cylinders are in a satisfactory condition (are not damaged and are moderately worn out), and the block of cylinders does not require in проточке (Cleaning and check of a condition of the block of cylinders/kartera of the engine see), at assemblage can be used old piston rings. Normal deterioration of pistons is shown in the form of a uniform wipe of persistent surfaces in a vertical direction and accompanied by an easy weak point of landing of piston rings in the flutes.
7. Attentively examine pistons on presence of cracks in areas of skirts, installation sites of piston rings and round apertures under a piston finger.
8. Pay attention to defects such, as teases and attritions on surfaces of a skirt, a hole in the bottom and прогары on its edges. Strong damage of skirts of pistons testifies to frequent overheats of the engine, and also appear as a result of infringement of correctness of process of combustion of an air-fuel mix. It is necessary to check up carefully a condition of components of systems of greasing and cooling. Teases on lateral surfaces of pistons specify in the admission of gases bypassing piston rings. Holes and прогары in the bottoms of pistons also are signs of deviations in the course of mix combustion (too early ignition, a detonation, etc.). In any case, in order to avoid relapses, the reasons of the revealed infringements should be defined and eliminated.
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It is necessary to check up also serviceability of functioning of system of ignition/tnvd and a condition of fuel atomizers. |
9. Corrosion of pistons in the form of cavities testifies to penetration of a cooling liquid into chambers of combustion and-or картер the engine. The reason, besides, should be revealed and eliminated.
10. On engines with the aluminium block and "wet" sleeves possibility of replacement of pistons in an individual order is absent. The structure of the replaceable complete set without fail includes also new piston rings and sleeves of cylinders (Cleaning and check of a condition of the block of cylinders/kartera of the engine see). For engines with the pig-iron block the complete set of new pistons can be ordered in company Citroyon service-centre.
11. Attentively check up rods on presence of cracks around the top and bottom heads. Estimate degree of deformation of crosspieces of rods. The probability of damage of rods is very small, if only there was no jamming and a strong overheat of the engine. Thorough check of a condition of rods can be made only in the conditions of a workshop of car-care centre with application of the special diagnostic equipment.
12. On all engines before assemblage it is necessary to make replacement of nuts and bolts of fastening of covers of the bottom heads.
13. On all petrol engines piston fingers are planted in the top head of rods внатяг, therefore procedures of removal and installation of pistons should be made by experts of a car repair shop, at whose order there is a corresponding equipment. Track, that in case of replacement of pistons the replaceable answered on dimensional group to diameters of cylinders.
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Developers of the car do not recommend to make dismantling of shatunno-piston groups. In case of need make their replacement in gathering. It is not necessary to establish the new piston on an old rod and on the contrary. |
14. On diesel engines piston fingers have floating landing and are fixed by lock rings. Procedure of removal of pistons from rods is described more low.
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18. Attentively examine a piston finger and the top head of a rod on presence of signs of deterioration and damages. In case of strong deterioration the finger varies complete with the landing plug. Replacement of plugs demands use of a special press and lies out of limits of qualification of the average mechanic-fan. The facet should be accurately removed from the new plug.
19. Necessity for replacement actually rods can result from engine jamming. Try to estimate visually parallelism of an arrangement of planes of heads of a rod. For more detailed check it is necessary to deliver rods in a car-care centre workshop.
20. Check up a condition of all components, replaceable details should be ordered only in the firm services-centres of company Citroyon. New pistons are delivered complete with piston fingers and lock rings. However, a lock ring can be got and in an individual order. |