Nissan Maxima QX

since 1993 of release

Repair and car operation

Nissan Maxima QX
+ Nissan Maxima brand Cars
+ Maintenance instruction
+ Settings and routine maintenance
- Engine
   + SOHC Engines
   + DOHC Engines
   - General major maintenance of the engine
      General information
      Check of pressure of oil
      Check of kompressionny pressure in cylinders
      Diagnostics of a condition of the engine with use of the vacuum gage
      Alternative versions of schemes of regenerative repair of the engine
      Removal of the power unit from the car - preparation and precautionary measures
      Removal and engine installation
      Order of dismantling of the engine by its preparation for major maintenance
      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 shatunno-piston assemblies
      Removal of a cranked 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 shatunno-piston group
      Check of a condition of a cranked shaft
      Check of a condition and selection of loose leaves of radical and shatunny bearings of a cranked shaft
      Check of a condition of camshafts, pushers of valves and bearings
      Engine assembly order
      Installation of piston rings
      Installation of a cranked shaft and check of working gaps of radical bearings
      Installation of a back epiploon of a cranked shaft
      Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft
      Trial start and engine running in after major maintenance
+ Systems of cooling, 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, once again carefully check purity of all components.
2. After head return from a workshop in it valves with accompanying components will be already established. In this case it is necessary to omit procedures of the following two paragraphs and at once to pass to the actions described in paragraph 5.
3. Grease cores of valves with liquid oil and fill them in the directing plugs. Establish saddles of klapanny springs.

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

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

4. Establish on a core a klapanny spring (ы) and its plate. The special tool compress 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 greasing. Slowly release a spring (ы) 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 establish camshafts, assembly of directing pushers and a yoke with axes.
7. Track, that the subject old components removed from a head further use were established strictly on the former places.