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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Removal of shatunno-piston assemblies

Before starting extraction from the engine of shatunno-piston assemblies, it is necessary to remove heads of cylinders, the pallet of a case and a maslozaborny tube (see. Part SOHC Engines or DOHC Engines of the present Chapter).


 PERFORMANCE ORDER

1. By means of a special vertical drill completely remove traces of step wear from the top part of cylinders - act according to the instructions of the manufacturer enclosed to a vertical drill. The step is formed on piston stroke border, approximately in 6.4 mm under the top cut of the cylinder at the expense of mechanical production of metal and a nagaroobrazovaniye, to define its existence it is possible to the touch a finger nail. Attempts of extraction of shatunno-piston groups without removal of step development are fraught with damage of pistons.

2. Having finished preparation of cylinders, overturn the engine upside down so that the cranked shaft appeared from above.

3. Before removing rods from a cranked shaft, estimate size axial люфта their landings on necks of the last. Densely enter an edge (I) measuring щупа into a gap between a lateral wall of the bottom head of a rod and a crank cheek, having completely chosen люфт a rod on a shaft neck. The total thickness of the picked-up edges щупа also will equal to size axial люфта a rod. Compare result of the carried-out measurement to requirements of Specifications. If the size axial люфта exceeds limiting admissible value, this rod is subject to replacement. Axial люфт a new rod, or old on new to a shaft, it can appear less than the bottom admissible limit, in this case the rod can be pierced - consult with specialists of car-care center. Serially check all remained rods.

4. Make sure available on the bottom heads of rods and their covers of identification labels of belonging to the cylinder, in case of need put labels independently by means of a small center punch.
5. In stages (on 1/2 turns for an approach) weaken nuts of fastening of covers of the bottom heads of rods so that there was a possibility of their otvorachivaniye manually. Uncover the first rod together with the loose leaf of the bearing placed in it, try not to drop the last.

6. For protection of a neck of a shaft and a mirror of the cylinder pull on bolts of fastening of the bottom head of a rod pair of pieces of a hose suitable on the size.

7. Take from a rod head the bearing loose leaf, then, having rested the wooden handle of a hammer against a bearing bed in the bottom head, вытолкните shatunno-piston assembly from the block at the top the cylinder. At resistance emergence immediately stop extraction of assembly and make sure of completeness of removal of step wear in the top part of the cylinder.
8. Operating in a similar manner, take from the engine the remained shatunno-piston assemblies.

Installation of a rod subject to extraction coaxially to the cylinder is made by the corresponding provorachivaniye of a cranked shaft, - extraction start only after the rod will be strictly located parallel to a cylinder axis!

9. In order to avoid casual mechanical damage of bearings and loss of components, establish into place loose leaves and fix covers of bearings on the bottom heads of the rods, having by hand tightened nuts.
10. Do not remove pistons from rods (for more details see. Section Check of a condition of components of shatunno-piston group).