1. Careful cleaning of a head of cylinders and components of the valvate mechanism with the subsequent detailed check of their state will help to determine the approximate volume of the forthcoming recovery work.

Strong overheats of the engine can lead to deformation of a head of cylinders and violation of planeness of its interfaced surfaces.

2. Scratch out all traces of material of old laying and sealant from the interfaced planes of a head of cylinders, the inlet pipeline and a final collector, - try not to damage surfaces. Application of a special razmyagchitel which should impregnate previously stuck deposits will significantly facilitate work, - ask in shops of automobile accessories.
3. Remove all traces of a scum from walls of water channels.
4. A rigid wire brush carefully clean all available cavities and openings. At strong pollution of canals the clearing of a head should be charged to experts.
5. "Banish" the tap suitable by the size each of bolted openings, having removed corrosion products, traces of old sealant from a carving and having restored the damaged rounds. In the presence of access to a source of compressed air, blow openings, having removed from them shaving and small garbage.

When using compressed air do not forget to put on goggles!

6. A wire brush smooth out a carving of hairpins of fastening of the inlet pipeline and a final collector.
7. Wash out a head solvent and carefully dry it. Use of compressed air will allow to reduce significantly the term of drying and will give a quality assurance of a clearing of badly available cavities and openings.

Different structures for removal of traces of a deposit significantly facilitating implementation of the procedure of cleaning can be got in many shops of automobile accessories. Remember that such means usually are chemically aggressive and have to be applied with observance of the appropriate measures of precaution, - strictly adhere to instructions of the manufacturers who are usually given on the label of a container.

8. Wash out solvent pushers of valves, then carefully dry them. Use of compressed air will significantly facilitate implementation of the procedure (do not forget to put on goggles).

The pushers equipped with hydroproofreaders should be put upside down in an oil bathtub. Remember that at assembly all components have to be installed strictly on the former places.

9. Wash out in solvent and carefully dry valvate springs, their plates, saddles and crackers of cutting locks, - try not to mix components.
10. Scratch out the bulk of the valves of deposits created on surfaces, then a wire nozzle to the electric drill finally smooth out surfaces of cores and plates of valves - you watch that valves were not mixed.

3. Turn a head so that to provide a possibility of installation of a clamp on it for tightening of valvate springs, - usually the head keeps within horizontally pro-masonry surface to the performer and valvate springs from it.

4. Having enclosed a mandrel for extraction of a spring in a pusher nest, squeeze a spring.

5. Helping itself the screw-driver, by means of a small magnet take crackers of the cutting lock from the landing nest.
6. Release a clamp and remove a valvate spring.
7. Take the valve from a head of cylinders. At the corresponding complete set remove a maslootrazhatelny cap.

Special devices for removal of maslootrazhatelny caps are issued. It is alternatively possible to use usual nippers, - try not to damage pusher nest walls that is fraught with decrease in adequacy of landing of the last.

8. At the corresponding complete set remove an adjusting washer from a spring, - again use a magnet or the screw-driver.
9. Working in a similar manner, remove components of the remained valves. Remember that all components should be put in accurately marked containers or packages.

1. For compression of valvate springs on heads of this type the special tool of standard type is usually used. However, on some models for installation of such tool it can appear insufficiently empty seat, - in such cases it is necessary to use the tool of strubtsinny type described above.
2. If did not do it yet, remove components of the mechanism of the drive of valves (levers of the drive of valves or a yoke with the axes) and take the camshaft(s). At the corresponding complete set remove also hydraulic proofreaders of valvate gaps.

All removed components should be put in an organized order, special attention paying marking clearnesses, - at assembly they have to be established strictly on the former places!

3. Turn a head so that to provide an empty seat under installation of the tool for compression of valvate springs.

4. Having started the tool, squeeze a spring of the first valve, having completely unloaded its plate. Owing to development of a nagaroobrazovaniye the plate can "stick" to crackers of the cutting lock and for release it should be tapped slightly the hammer.

5. By means of a small magnet take crackers of the cutting lock from landing to a flute on a valve core.

6. Release the tool and remove a plate and a spring from a valve core.

7. At the corresponding complete set remove a maslootrazhatelny cap. It is easier to remove usually maslootrazhatelny cap from the valve taken from the engine (see below).

8. Turn a head so that to provide a possibility of removal of the valve from it.
9. Take the valve from a head of cylinders.

In case of need previously process edges of a flute for installation of crackers and an end face of a shaft of the valve a file with small tooth.

10. At the corresponding complete set remove an adjusting washer of a valvate spring, - use a magnet or the screw-driver.

11. Working in a similar manner, remove the remained valves from a head. Remember that all components should be put in accurately marked containers or packages.

1. Check working facets of plates of valves for existence of cracks, cavities and traces of excessive wear. Burn-out traces the easiest come to light at survey of a cylindrical part (corbel) of a plate. The corbel has to be present at a plate without fail and have identical width on all perimeter of the valve. The rounding off or an oplavleniye of edges of a corbel specifies on прогар the valve. It is also necessary to estimate degree of not planeness of a face surface of a plate, - in the presence of an excessive deflection in its central part the valve is subject to replacement (it is desirable complete with the others).
2. Further it is necessary to check a condition of a shaft of a core of the valve, - attentively examine its end face and edges of a flute under installation of crackers of the cutting lock, - make sure of lack of zadir and agnails (especially if at removal of the valve it was necessary to resort to data processing of sites a file). The end face of a core of the valve has to be absolutely flat while some rounding off always takes place at a considerable run of the unit. In case of need make restoration of planeness of an end face by a valve pro-point.

3. Having taken for a drive a valve core on a flat surface (as that the windowpane can serve), check it for existence of signs of a bend.

4. In conclusion measure diameter of a core of the valve in several places by means of a micrometer. Compare among themselves results of measurement, - the core has to have uniform thickness on all the length. If the minimum tolerance of diameter of a core of the valve is not specified in Specifications, it is necessary to accept value of 0.025 mm as a reference point.

5. The defective or worn-out over an admissible limit valves are subject to replacement (it is desirable complete with the others).

3. In the presence of near at hand special device, check the effort developed by springs. Compare results of measurements to requirements of Specifications.
4. The sunk, defective and excessively worn-out springs are subject to replacement (it is desirable for all a set).
5. Plates of springs seldom need replacement, nevertheless, estimate a condition of their working surfaces contacting to a spring and crackers of the cutting lock. In case of identification of signs of deformation or cracks make replacement.
6. Estimate degree of wear of internal and external working surfaces of crackers of cutting locks. In case of need crackers are replaced in a set with the valve.

1. Having made sure of serviceability of a condition of valves, it is necessary to estimate degree of wear of the directing plugs in size of gaps of landing of cores of valves at them.

Preferably nevertheless to replace valves.

2. Before starting measurements, attentively examine the directing plugs on existence of cracks, zadir, agnails and other mechanical damages. When using plugs of removable type (on all heads made of aluminum alloy) estimate density of their landing, - existence of any weak point is inadmissible. All plugs have to act on identical height (including from saddles of springs).

3. Fix the dial measuring instrument of plunger type from the spring party of a head of cylinders. Slightly grease a core of the valve and fill it on the regular place. Densely press a measuring instrument plunger to a side surface of a core of the valve around a shaft and nullify the device. Pull the valve here and there in the directing plug and consider the indication of the measuring instrument, - write down result. Deploy the measuring instrument under 90 ° rather initial situation and repeat check. Having compared results of measurements among themselves, estimate the size of ovality of the directing plug. Also compare results of both measurements to requirements of Specifications. The special telescopic nutromer intended for determination of internal diameter of the directing plugs of valves are issued, - when using such device compare results of measurements to the standard requirements provided in Specifications.

4. The worn-out or damaged directing plugs are subject to replacement or a pro-point.

1. Make visual survey of saddles of valves. Pay attention to existence of cracks, cavities and traces of a progar. Approximately estimate depth of landing of saddles in a head, - excessive deepening speaks about wear of components. In case of identification of cracks of a saddle are subject to replacement.
2. In the presence of near at hand special tool, check saddles for existence of signs of ovality. Compare results of measurements to requirements of Specifications, in case of need make a pro-point.

In the absence of standard values it is necessary to consider maximum admissible ovality of 0.051 mm.

1. Carefully smooth out the interfaced surfaces of a head of cylinders, having completely removed from them all traces of material of old laying.
2. Check of planeness is made by means of the special measuring instrument and the probe of lezviyny type. Measurement is performed along DP of a head and on both diagonals of the interfaced surface.

As the measuring instrument of planeness the steel ruler put on an edge can be used.

3. If the size of not planeness exceeds 0.076 mm on length of 15.2 mm (or 0.152 mm at the full length of the interfaced surface), the head of cylinders is subject to a pro-point.

After a pro-point of heads of cylinders of V-shaped engines it is necessary to pierce as appropriate also landing flange of the inlet pipeline for the purpose of compensation of change of provision of the interfaced surfaces.

1. Usually cracks in casting of a head appear around an arrangement of combustion chambers, however, the probability of their education and near candle openings, saddles of valves and the basic surfaces of levers of the drive of valves is not excluded.
2. Special attention should be paid to check of a state to flow near final ports.
3. It is necessary to remember that visual survey does not allow to reveal the latent defects of casting. Much more detailed picture of structure of a body of a head can be received during performance of defectoscopy with application of methods of a magnetic resonance (Magnaflux®), - for the heads made of cast iron, or with use of the fluorescing structures (Ziglo®), - for light-alloy heads. Checks of this sort can be always made for quite reasonable payment at car repair shops.
4. The head having mechanical damages is subject to replacement.

1. If valves are recognized suitable for further use, it is necessary to make a pro-point of face surfaces of their shafts and grinding in of working facets to the saddles.

New valves are also subject to grinding in after which implementation they become rigidly tied to the saddles.

2. Turn a head of cylinders upside down.
3. Slightly grease cores of valves and fill them on the regular places in a head.
4. Raise the valve which is subject to grinding in over a saddle and apply on a working surface of the last of a little special pritirochny paste.
5. Slightly moisten a sucker of the pritirochny holder and fix the last on the flat party of a plate of the valve.
6. Rotating the driving handle of the tool between palms, begin to grind in the valve to the saddle. Try to intercept more often the handle, at the same time slightly changing position of the valve concerning a saddle in order to avoid formation of furrows.
7. Continue grinding in until on a working surface of a saddle the equal ring of opaque gray color of width, identical on all perimeter, is not formed.
8. Separate the drive and you pass to grinding in of the next valve.
9. In conclusion do not forget to wipe carefully components, having removed all traces of pritirochny paste and an abrasive from their surface.
Springs, plates and crackers of cutting locks
10. The components listed in subsection heading are not subject to recovery repair and in case of an exit of their system have to be replaced.

1. In automobile engines only two types of the directing plugs are applied: removable (are used in light-alloy heads) and built in (are used the heads made of cast iron).

Pig-iron heads sometimes are also completed with removable plugs.

2. Restoration of worn-out guides of plugs can be made by one of four ways: nakatka; installation of inserts; boring and replacement.
3. At a nakatka metal of a detail is deformed that leads to reduction of a gap. Centering of the plug is at the same time restored. Nakatka is the simplest and cheap method of restoration of the directing plugs, however demands existence of special tool base and leads to considerable reduction of service life of the restored detail.
4. The bronze insert can be installed in the worn-out directing plug after its preliminary boring. The inserts equipped with a carving are issued, - for their installation the plug needs to be cut previously a tap of the corresponding size. Thin-walled plugs of cutting type can be alternatively installed, - they refuel in the chiseled plug then razvaltsovyvatsya by the special tool and are pierced under the necessary size.
5. In the effective way, especially at restoration of plugs of the built-in type their boring under valves of the bigger size is. Boring is made by means of a special vertical drill in the range from 0.076 to 0.762 mm (most often - 0.381 mm). It is necessary to buy repair valves of the corresponding size.
6. For replacement of plugs of the built-in type they need to be drilled from a head. Then nests are chiseled under the required size and in them repair plugs are pressed. Landing of new plugs is carried out by means of the hammer and a step drift. Special attention at installation of repair plugs has to be paid to centering of their rather valvate saddles. Landing height of the new plug also has to be strictly to correspond original, - do not forget to measure it before removal of old plugs. Old plugs are tapped from a head also by means of the hammer and a drift. Before installation of repair plugs it is necessary to define whether they have to carry out sealing of a water shirt of a head or not, - if yes, it is necessary to use the corresponding sealant, otherwise the plug and walls of a reception nest before landing should be greased with assembly lubricant. Landing of plugs in a head is made from installation of valvate springs.

Use of set of technological washers will help at control of depth of landing of plugs.

1. If saddles of valves are in satisfactory condition, then after implementation of grinding in of valves (see above) it is possible to start assembly of a head of cylinders (see below).
2. Restoration of the worn-out or damaged saddles has to be made in the conditions of a workshop of car service. At a pro-point of saddles special attention is paid to centering of their rather directing plugs of valves.

1. At especially strong deformation of the interfaced surfaces the head is subject to replacement.
2. The pro-point of the interfaced head surfaces (if in it there is a need) has to be made in the conditions of a workshop of car service.

At removal the pro-point course from surfaces of a head of a layer of metal standard requirements to geometrical parameters have to be observed.

3. After return of a head from its work it is necessary to clean once again very carefully (see above).

1. Installation of the components of valves drowned in a nest of a pusher on heads of this type requires the small screw-driver, a clamp for compression of valvate springs with a mandrel, a little white lubricant (tsiatim) and the mass of patience.
2. Slightly grease cores of valves and establish them on the regular places in a head of cylinders.
3. At the corresponding complete set establish where follows adjusting washers of valvate springs.
4. Establish new maslootrazhatelny caps (if those are provided by a design). If the cap is put on the directing plug, previously slightly grease an external surface of the last. If instead of a cap the sealing ring is used, it is established after compression of a valvate spring, but before landing to a core of the valve of crackers of the cutting lock.
5. Dress a spring and its plate on a valve core.
6. Establish a mandrel and squeeze a spring by means of a special clamp.
7. Working with the screw-driver as the pallet, fill bends of crackers of the cutting lock with dense lubricant, - it will help to record temporarily crackers on a valve core to a spring otpuskaniye.
8. Picking up the screw-driver (again use lubricant), put crackers on the regular places on a valve core, having densely pressed them to a surface of the last.
9. Slowly release the clamp squeezing a valvate spring, - track that crackers did not drop out, - and remove it from the engine.
10. Working in a similar manner, install components on the remained valves.

11. Establish pushers, the camshaft(s) (do not forget to check installation of valvate gaps) and the other components which were removed in the course of dismantle.

1. Slightly grease cores of valves and establish the last on the regular places in a head of cylinders.
2. At the corresponding complete set establish where follows adjusting washers of valvate springs.
3. Establish new maslootrazhatelny caps (if those are provided by a design). If the cap is put on the directing plug, previously slightly grease an external surface of the last. If instead of a cap the sealing ring is used, it is established after compression of a valvate spring, but before landing to a core of the valve of crackers of the cutting lock.
4. Dress a spring and its plate on a valve core.
5. By means of the special tool squeeze a valvate spring.
6. Put crackers of the cutting lock on a valve core.
7. Slowly release a valvate spring, - track that crackers did not drop out of a flute on a valve core.
8. Remove the tool squeezing a spring from a head.
9. Working in a similar manner, install components on the remained valves.
10. Establish pushers, the camshaft(s) (do not forget to make adjustment of valvate gaps, - see the Head Nastroyki and routine maintenance) and the other components which were removed in the course of dismantle.