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 a bent shaft

 PERFORMANCE ORDER

1. Remove with a grinding stone, a file or a scraper agnails from edges of oil openings.

2. Wash out a bent shaft solvent, then carefully dry, having whenever possible used compressed air. Do not forget to clean a rigid brush oil openings. Then also wash out them solvent.

When using compressed air do not forget to put on goggles!

3. Check radical and conrod necks of a bent shaft for existence of zadir, cavities, cracks and signs of uneven wear.
4. Examine all surface of a shaft on existence of cracks and other damages. For identification of the hidden cracks it is necessary to resort to magnetic powder defectoscopy, - give a shaft to a workshop of car service.

5. Measure by a micrometer diameters of radical and conrod necks of a shaft. You perform measurement of diameter of each neck in several points on length and perimeter that will allow to estimate the size of its conicity and ovality which should not exceed the limit of admissible ranges (see Specifications). It is necessary to estimate also the size of a beating of a bent shaft, - pair of V-shaped blocks and the DTI measuring instrument will be required. In the absence of necessary stock ask for the help specialists of car service.

6. In case wear/conicity/ovality of necks exceeds admissible size, or mechanical damages of surfaces take place, the bent shaft should be given to a pro-point. After a pro-point of a shaft it is necessary to pick up new inserts of radical and/or conrod bearings of the corresponding repair size.

7. Check a condition of omental necks on both pins of a bent shaft. Existence of the developed flutes, agnails or zadir will lead to an exit of new epiploons out of operation in the near future. In certain cases pins can be restored by a pro-point and a napressovka on them special thin-walled plugs. If such recovery repair is not possible, replace a shaft.

8. Check a condition of inserts of radical and conrod bearings (see the Section Check of a State and Selection of Inserts of Radical and Conrod Bearings of a Bent Shaft).