Service Nissan Sunny with 1991 on 1997 of release in a body n-14.
1. The maintenance instruction
2. Maintenance service
3. Engines
3.1. The petrol engine in volume of 1,4 and 1,6 litres
3.1.1. Kinds of repair of the engine without dismantle from the car
3.1.2. Dismantle and engine major repairs
3.1.2.1. Specifications
3.1.2.2. Engine major repairs
3.1.2.3. Diagnostics of the engine by means of the vacuum gauge
3.1.2.4. The power unit from a manual transmission
3.1.2.5. The power unit with automatic transmission
3.1.2.6. A head of the block of cylinders
3.1.2.7. A head of cylinders and valves
3.1.2.8. Pistons and rods
3.1.2.9. Коленвал
3.1.2.10. The block of cylinders
3.1.2.11. Shatunno-piston group
3.1.2.12. Radical and шатунные bearings
3.1.2.13. Piston rings
3.1.2.14. Start-up of the engine after major repairs
3.2. The petrol engine in volume of 2,0 litres
3.3. The diesel engine
4. Cooling system
5. Heating and ventilation system
6. Fuel and an exhaust system
7. System of start-up of the engine
8. Coupling
9. Transmissions
10. Semiaxes
11. Brakes
12. Suspension brackets and a steering
13. A body
14. An electric equipment
 




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3-1-2-7-golovka-cilindrov-i-klapany.html

3.1.2.7. A head of cylinders and valves


Careful clearing of a head of the block of cylinders and details клапанного the mechanism with the subsequent check will allow to estimate amount of works on repair клапанного the mechanism.
The prevention

If the engine often overheated, most likely the head of cylinders could warp, carefully check up presence of signs of deformation of a head.


Clearing

PERFORMANCE ORDER
1. Clear demountable planes of a head of cylinders.
2. Clear the combustion chambers, all apertures and channels of a deposit, then wash out a head of cylinders solvent.
3. Remove massive adjournment of a deposit from valves.

Check


The prevention

Before drawing a conclusion on necessity to repolishing of details necessarily execute all checks described below procedure.


HEAD OF CYLINDERS

PERFORMANCE ORDER
1. Attentively examine a head, check up presence of cracks, traces of penetration of a cooling liquid and other damages. At detection of cracks a head of cylinders replace.
2. Check up deformation of a demountable plane of a head of cylinders. If the curvature of a demountable plane a head it is necessary прошлифовать is revealed. If deformation of a demountable plane is that that the height of a head after polishing becomes less standard a head replace.
3. Check up a condition of saddles of valves. At presence питтинга (poles), cracks, traces прогара head repair in a car-care centre workshop is required. Insignificant defects can be removed valve grinding in.
4. Check up deterioration of directing plugs. For this purpose the valve insert into the corresponding directing plug and shake here and there. Admissible is small, hardly notable люфт.
5. If люфт the valve in the plug considerable measure diameter of the valve. If diameter of the valve has considerably decreased owing to deterioration the valve replace. If diameter of a core of the valve corresponds to norm it is necessary to replace directing plug (it is carried out in a car-care centre workshop).
6. If directing plugs vary, saddles of valves follows перешлифовать (or перезенковать) only after запрессовки new plugs.

VALVES

PERFORMANCE ORDER
1. Check up presence on valves of cracks, burn-out traces, задиров and a fillet formed owing to deterioration on cores. Valve turn check up its bend. Check up development of end faces. At detection of any signs of deterioration and damages the valve replace.
2. If as a result of this check it will be found out that a valve condition satisfactory measure diameter of the valve in several places. Appreciable distinction of diameters specifies in deterioration of a core of the valve. At detection of appreciable distinction of diameters at least in two places the valve replace.
3. If a condition of valves satisfactory they should be ground in to saddles. If on saddles there are only insignificant damages, or the saddle was exposed to repolishing grinding in can be executed on мелкодисперсном structure. Крупнодисперсный притирочный it is necessary to apply structure only in case of detection of traces of deep development or a strong burn-out of saddles. In this case it is necessary to hand over a head of cylinders and valves on check to the skilled expert, whether it is necessary to define перезенковать saddles, or to replace loose leaves of saddles (if are provided).
4. Before grinding in a head of cylinders put on an equal surface, combustion chambers upwards.
5. Put on a saddle facet a thin layer притирочной pastes. Grinding in carry out, turning the adaptation on 180 in both parties and periodically raising the valve for uniform redistribution of an abrasive material.
6. Grinding in on rough structure comes to an end after formation of a monotonous matte corbel on valve and saddle facets. Wipe the valve and a saddle from the rests of paste and continue grinding in on мелкодисперсном structure. Grinding in is considered finished at formation on facets of the valve and a saddle of a uniform continuous corbel of grayish colour. The further grinding in is not supposed, as because of excessive development of a saddle its subsequent repair can become impossible.
7. After the termination of grinding in of all valves carefully wash out all details solvent.

DETAILS КЛАПАННОГО OF THE MECHANISM

PERFORMANCE ORDER
1. Check up presence on springs of traces выкрашивания and damages. Rough check of a condition of a spring can be spent by comparison of length of a spring in a free condition from the standard.
2. Check up a deviation of a spring from a vertical by means of a square and compare to the standard.
3. If at least one of springs is damaged, has the raised deviation from a vertical, or has lost elasticity replace all springs in the complete set. Have in view of that at major repairs of a spring of valves it is recommended to change irrespective of their condition.
4. Maslosemnye caps vary irrespective of their condition.


3.1.2.6. A head of the block of cylinders

3.1.2.8. Pistons and rods