Jeep Grand Cherokee

1993-1999 of release

Repair and operation of the car

Jeep Grand Cherokee
+ Cars of the Jeep Grand Cherokee brand
+ Settings and routine maintenance
+ Line six-cylinder engine
+ V8 engine
- Procedures of the general and capital repairs of the engine
   General information
   Capital repairs of the engine - the general information
   Check of compression pressure in cylinders
   The diagnostic checks made by means of the vacuum gage
   Methods of removal of the engine and necessary precautionary measures
   Removal and installation of the engine
   Options of restoration of the engine
   Order of dismantling of the engine
   Dismantling of a head of cylinders
   Cleaning and check of a condition of a head of cylinders
   Service of valves
   Assembly of a head of cylinders
   Removal of conrod and piston assemblies
   Removal of a bent shaft
   Cleaning of the block of the engine
   Check of a condition of the block of the engine
   Honingovaniye of cylinders
   Check of a condition of conrod and piston assemblies
   Check of a condition of a bent shaft
   Check of a condition of radical and conrod bearings
   Engine assembly order after completion of its capital repairs
   Installation of a bent shaft and check of gaps of radical bearings
   Installation of piston rings
   Installation of conrod and piston assemblies and check of gaps in conrod bearings
   The first start of the engine after capital repairs
+ Cooling systems, heating and air conditioning
+ A power supply system and production of the fulfilled gases
+ System of electric equipment of the engine
+ Systems of decrease in toxicity of the fulfilled gases and engine management
+ Manual box of gear shifting
+ Automatic transmission
+ Transfer case
+ Coupling and transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ System of onboard electric equipment
+ Governing bodies and methods of operation

Service of valves

In view of complexity of character of the procedure and need of use of the special tool and the equipment, the service of valves, their saddles and guides of plugs which is usually called by valvate works has to be carried out by the professional mechanic.

To the amateur mechanic on forces there will be a carrying out removal and dismantling of a head of cylinders, implementation of preliminary cleaning and check of a condition of components then again it is necessary to collect and deliver a head for performance of valvate works in a workshop of car service. External survey will help you to find out in what state there are components of a head of cylinders and the valvate mechanism and to determine the volume and the nature of the forthcoming recovery work. On the basis of the analysis of the available information you will be able to define what replaceable details can be necessary at performance of the procedure of service of valves by the expert.

The specialist of dealer office or workshop of car service will carry out removal of valves and their springs and will be engaged in restoration or replacement of valves and valvate saddles, restoration of the directing plugs, check of a state and replacement (in case of need) of plates (or rotary support) springs and crackers of cutting locks, replacement of maslootrazhatelny caps of valves, assembly of components and check of adjusting height of valvate springs. Also, in case of need, machine processing of a head for the purpose of restoration of planeness of its interfaced surface will be made. On V8 engines both heads have to be sfrezerovana on identical depth and if the layer of metal more than 0,5 mm thick is removed, lower and the side interfaced surfaces of the inlet pipeline have to be processed as appropriate for the purpose of adequate combination of all channels and openings.

The pro-point of valvate saddles has to be made in a workshop of car service by means of the special machine (see a picture) - centering of a new saddle in relation to the directing plug of the valve is made by means of ottsentrovanny on a small beard and the grinding stone having strictly certain form.

Such processing provides absolute planeness of the deformed interfaced surfaces.

After performance by the professional of valvate works the head has to acquire characteristics new. The head returned from a workshop before installation on the engine should be subjected to careful cleaning for the purpose of removal of an abrasive and small metal particles which could remain after machining of a head and grinding in of valves. Having used compressed air, carefully blow all smallest openings, channels and cavities.