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

Check of a condition of the block

PERFORMANCE ORDER

1. Previously the block has to be carefully cleared.
2. Make external survey of the block regarding identification of traces of corrosion, cracks and other damages. Check a condition of carving openings. It will also be reasonable to make testing of the block for existence of the hidden cracks in the conditions of a workshop of car service with use of the special diagnostic equipment. In case of detection of defects the block is subject to recovery repair or replacement.
3. Check a condition of mirrors of cylinders.

4. Estimate sizes taking place of conicity and ovality of cylinders:

a) Measure diameter of each of cylinders in top (directly under limit of step wear), the central and lower sections in the plane of a parallel axis of cranked;
b) Now measure diameters at the same three levels, but in the plane, a perpendicular axis of the block;
c) The size of conicity of the cylinder is determined by a difference between results of measurements in the top and lower sections. Ovality is called the difference of diameters in a parallel and perpendicular axis of a bent shaft in each of the planes.
d) Compare results of check to nominal rates (see Specifications).

5. Working in the described manner, serially check all cylinders.
6. At detection of noticeable defects or a deviation of results of measurements from standard requirements, the block of cylinders is subject to recovery machining in the conditions of a workshop of car service. If in the course of recovery repair boring of cylinders was made, the engine has to be completed with new pistons corresponding repair (with excess) the size.
7. If the condition of mirrors of cylinders during performance of check is found satisfactory at simultaneous observance of standard requirements to a form of cylinders and to gaps of landing of pistons in them (see the Section Check of a Condition of Components of Conrod and Piston Group), need for a pro-point of cylinders disappears, - will only be to execute a honingovaniye of their mirrors enough (see Honingovaniye's Section of mirrors of cylinders).

8. Check planeness of the surface of the block interfaced to a head. Compare result of measurements to requirements of Specifications, in case of need give the block to a pro-point.