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Service components of the cylinder head and camshaft
 | This procedure is one of those whose implementation does not require the removal of the engine from the car. |
Details of the installation of the cylinder head and associated components The design of the cylinder head Scheme of the valve train Dismantling and maintenance components | - Remove all impeding the implementation of the procedure components (see. Illustration Dismounting components when removing the power unit), - refer to the content of the relevant sections in this chapter, as well as Chapters Systems of cooling, heating, ventilation and air conditioning, power supply system, motor control / Emission Exhaust gas and exhaust and systems of electric motor.
- Remove the gas distribution belt (see. Section Checking and replacing the timing belt at Chapter Current leaving and service), and the timing components (see. Section Removal and installation of components of timing).
- Disconnect the cylinder head intake manifold and exhaust manifold.
 | - Acting strictly in a certain order, let go of the cylinder head bolts. Finally, turn out fixing bolts and remove the head, pre obstuchal the perimeter interface with power hammer with soft brisk. Remove head gasket.
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- Remove the injectors toplivootvodnymi tubes (see. Power supply systems, engine control / emission control and exhaust).
- Unscrew and remove the glow plugs, remove them wiring (see chap. Current care and maintenance).
- Inspect the head for signs of leaks, cracks, cavities in the mating surfaces and other mechanical damage. With the probe type and the blade flatness meter (set at the edge of a steel ruler) evaluate the degree of deformation of mating with the cylinder block, the intake manifold and the exhaust manifold surfaces of the head. Compare results of measurements to requirements of Specifications of the Head of Engine. Defective head must be replaced.
 | Restoration of the flatness of the mating surfaces of the cylinder head by mechanical processing in any case is not admissible! |
 | - Acting strictly in order, release the bolts of covers of bearings of a camshaft.
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- Remove the lid and remove the camshaft.
 | - Remove the valve tappets with shims - when assembling all the components should be established strictly on the former places.
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 | - Carefully wipe the bed head and bearing caps, then lay a camshaft on the regular place and measure the size of its axial play.
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- The set of Plastigage turn determine the value of working backlashes in camshaft bearings, - track correctness of arrangement covers compliance Specifications Chapter Engine to the efforts of a tightening of fixture.
| Tightening the screws should be made in the reverse order of their release. |
 | - When installing the covers during the procedure measuring gaps in the bearings track correctness of their position.
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- Compare the results of the measurements to requirements of Specifications of the Head of engine, if necessary, replace the shaft and / or head.
 | - With plunger dial gauge (DTI) to determine the value protruding above the surface of the head / depth of planting in the head liner (1) combustion chamber - if the result of any of the measurements is outside the permitted range (see. Specifications of the Head of engine), replace the pads / head.
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 | - With the help of special devices compress the spring of the first valve and out of the groove on its core crackers of the cutting lock. Remove the device and remove the spring with plates and valve. Operating in a similar manner, remove the remaining components of the valve.
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 | - Using pliers, remove the valve stem seals valve guides.
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| Capture forceps cap is only possible after removing the bottom plate of the valve springs. |
 | - If necessary, acting on the rear side of the head, using a suitable punch emboss combustor liners, try not to lose the locking balls.
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- With the blade of the probe, measure the depth of the landing of the valve in the cylinder head. The nominal value of the depth of the landing flaps (both inlet and exhaust) is 0.75 ÷ 1.05 mm. If the result is within the range of 1.55 ÷ 2.55 mm, set on a plate valve spring washer equivalent. If the valve seat depth exceeds 2.55 mm, the cylinder head must be replaced.
- Assess removed from the engine valves. In case of signs of wear, deformation and other mechanical damage plates or rods replace the defective components.
| Slight burrs can be removed from the surfaces of the rods by means of a grindstone. |
- Lubricate the valve seat with a thin layer of red lead and, without turning, push it to the valve plate. Remove the valve and left on the surface of his working facet should assess the density of its pressing into the seat.
 | - In case the uniformity of the contact or release of the width of range (1.7 ÷ 2.3 mm), the saddle must be abraded Sharpening nozzle to remove burrs and barbs or machined using special cutters with working angles of 15, 45 or 60 degrees. During the processing of regular repeat quality check valve fit.
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 | - Make the seats grinding valves in the cylinder head, - as a means of using special lapping the fine abrasive paste, mixed in the engine oil. Try to avoid getting the mixture onto the valve stem. After the lapping contact patch should take the form of a continuous ring, located in the middle of a working facet of the plate. From this point on, each valve must be clearly tied to his saddle - this fact should be taken into account during assembly.
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- Using a micrometer, measure the diameter of the valve stem. The results of measurements record.
 | - Armed with a bore gauge (1), measure the inside diameter valve guides.
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- By subtracting the results of the first series of measurements from the corresponding results of the second series, determine the amount of movement of planting valve guide bushings. Compare the results of calculations to requirements of Specifications of the Head of engine, if necessary, replace the guides.
 | - With the help of a special device beat out guides from their landing slots in the head in the opposite side of the placement of the combustion chambers.
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- Put the new guide sleeve lock ring and with the help of a special device zastuchite sleeve in the mounting slot in the head, working from the opposite side of the placement of the combustion chambers, - a lock ring must completely hide in the landing nest.
| Pay attention to the structural differences between the guides, intake and exhaust valves. |
- After finishing the installation of new guides, repeat measurement of backlashes in their respective landing flaps.
| Installing the valve stem seals should be made after completion of the fitting of valves. |
- Carefully review the state of the valve springs - in the case of chips, cracks and other mechanical damage, replace defective components.
- Measure the free length of the spring rate the degree of violation of trim - the result of in excess of any of the measurement limit values (see. Specifications of the Head of Engine) replace the corresponding spring (s).
- Measure external diameters of pushers, write down the measurements. If the result is outside the permitted range replace the faulty components.
 | - Measure the internal diameter of the socket (2) for planting the pushers (1) in the casting head. Record the results. By subtracting the results of the first measurement of the results to determine the value of second landing backlash pushers. Compare results of measurements to requirements of Specifications Gdavy engine, if necessary, replace the corresponding pushers / cylinder head.
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- Measure the height of the cams of the camshaft, - if the result of any of the measurements is less than specified in the Specifications of the Head of engine limit, the shaft should be replaced.
- Measure the diameters of the bearing journals, check for the presence and roundness. Compare results of measurements to requirements of Specifications of the Head of engine, if necessary, replace the shaft.
 | - Place the tree in the prism and using the meter DTI check for bending. If the measurement exceeds the limit, replace the shaft.
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Assembly | - Installation is the reverse order. Make sure that all components are fitted and lapped sets strict on their seats.
 | - When planting stem seals use the special holder, - do not forget to pre-lubricated motor oil caps.
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- Rods valves before filling them into the guides also need to be lubricated - use molybdenum-containing lubricant landing crackers of cutting locks use special devices.
- When installing shims do not forget to apply oil on the end surfaces of the pushers.
 | - When installing the camshaft and lubricate his neck bearing bed clean motor oil, remember that planting camshaft bearing cap should be made on the sealant.
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 | - Tightening the fastening bolts of covers performed after installing the camshaft and oil seal in the reverse order of their release.
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- Install the camshaft, make the final assembly of the head, placing her external components. Ensure the cleanliness of the mating surfaces of the head, intake manifold and exhaust manifold, be sure to replace the gasket.
- When installing a new head gasket track correctness of its placement on the block.
- Before screwing head bolts checks should their length, - excessively elongated bolts (see. Specifications of the Head of engine) must be replaced. Tightening the screws should be done in stages (see. Specifications of the Head of Engine) in the reverse order of their release.
- Install the remaining components is made in the reverse order of their removal (see. The relevant sections in this chapter and Section Check and replacement of the timing belt in Chapter Current leaving and service).
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