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





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Dismantling of a head of cylinders

The new or restored head of cylinders always can be ordered in a workshop of car-care center or in a warehouse firm service center of the company manufacturer of the car. In view of need of use during dismantling and check of a condition of a head of some special tools, originators of the real Management consider that to the amateur mechanic more simply and will cheaper get a replaceable head, than to be got involved in rather difficult regenerative repair of the worn-out.


 PERFORMANCE ORDER

1. Dismantling of a head of cylinders demands preliminary dismantle of elements of the klapanny mechanism (inlet and final valves with accompanying components). On SOHC engines remove assemblies of yokes with axes. Take from heads camshafts with pushers of valves (the description of procedures of check of a condition of components see in the Section Check of a condition of camshafts, pushers of valves and bearings).

On SOHC engines the removed pushers in order to avoid hit in them air jams should not turn over on one side (see. Part SOHC Engines of the present Chapter). Alternatively it is necessary to put the removed pushers in the container filled with oil.

2. Prepare a set of accurately marked polyethylene bags for the organized warehousing of removed components of the klapanny mechanism.

3. By means of the special tool compress springs of the first valve and take from a flute on a core crackers of the cutting lock of a plate of springs. Carefully release the tool and remove from the valve a plate of springs, springs and their saddle (depending on a complete set).

Try not to damage internal walls of a nest under pusher landing at a szhimaniye of klapanny springs.

4. Take the valve from a head of cylinders and remove from the directing plug a maslootrazhatelny cap. If there is a valve jamming in the plug, push it back in a head and an oselok or a file with small tooth accurately smooth out flute edges under installation of crackers.

5. Operating in a similar manner, dismantle the remained klapanny assemblies. Put removed components of each of valves in the separate package equipped with the corresponding label, - at assembly each detail should be established strictly on the former place.
6. After all components of the klapanny mechanism will be taken and combined in the organized order, it is possible to start performance of procedures of cleaning and check of a condition of the engine (at full-scale regenerative repair before finish unit dismantling).