Nissan Maxima QX

since 1993 release

Repair and operation of the car

Nissan Maxima QX
+ Cars of the Nissan Maxima brand
+ Maintenance instruction
+ Settings and routine maintenance
- Engine
   + SOHC engines
   + DOHC engines
   - General capital repairs of the engine
      General information
      Check of pressure of oil
      Check of compression pressure in cylinders
      Diagnostics of a condition of the engine with use of the vacuum gage
      Alternative versions of schemes of recovery repair of the engine
      Removal of the power unit from the car - preparation and precautionary measures
      Removal and installation of the engine
      Order of dismantling of the engine by preparation it to capital repairs
      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
      Honingovaniye of mirrors of cylinders
      Check of a condition of components of conrod and piston group
      Check of a condition of a bent shaft
      Check of a state and selection of inserts of radical and conrod bearings of a bent shaft
      Check of a condition of camshafts, pushers of valves and bearings
      Engine assembly order
      Installation of piston rings
      Installation of a bent shaft and check of working gaps of radical bearings
      Installation of a back epiploon of a bent shaft
      Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft
      Trial start and running in of the engine after capital repairs
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Assembly of a head of cylinders


1. Regardless of that, the head went to a workshop for carrying out service of valves, or not before starting its assembly, carefully double-check purity of all components.
2. After return of a head from a workshop in it valves with the accompanying components will be already installed. In this case it is necessary to lower procedures of the following two paragraphs and at once to pass to the actions described in paragraph 5.
3. Oil cores of valves liquid and fill them in the guides of the plug. Establish saddles of valvate springs.

On SOHC engines for each of valvate springs (internal and external) the separate saddle is provided. At first the saddle of an external spring has to be established, then - internal. Through cores of valves put new maslootrazhatelny caps on the directing plugs.

On DOHC engines maslootrazhatelny caps "are put" on the guides of the plug by a careful zastukivaniye by the hammer through a special mandrel or a face head of the suitable size. On SOHC engines for landing of caps of inlet valves it is necessary to use special adaptation, caps of final valves can be put manually. Track that caps were not overwound on plugs.

4. Establish a valvate spring(s) and its plate on a core. The special tool squeeze springs, having lowered a plate, then establish in the opened top flute on a valve core crackers of the cutting lock. For the purpose of temporary fixing of crackers to an otpuskaniye of the tool grease them from the inside with dense lubricant. Slowly release a spring(s) and make sure of reliability of landing of crackers.

On SOHC engines each valve is equipped with two springs. At first it is necessary to enclose an internal spring in external, then the set in assembly is put on the valve. On all engines of a spring are established by an end face with the reduced step of rounds to a head.

5. On DOHC engines establish into place pushers of valves and camshafts.
6. On SOHC engines install camshafts, assembly of the directing pushers and a yoke with axes.
7. Track that removed from a head the old components which are subject to further use were installed strictly on the former places.