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



Installation of a bent shaft and check of working gaps of radical bearings

 PERFORMANCE ORDER

1. Installation of a bent shaft is the first step of the procedure actually of assembly of the engine. It is meant that at this stage the bent shaft and the block of the engine are already properly cleaned, checked and subjected to necessary recovery repair.
2. Turn the engine upside down.
3. Give fixing bolts, uncover radical bearings and spread out them on a workbench as installation on the engine.
4. If did not do it yet, take from the beds in the block and covers old inserts of radical bearings. Wipe beds pure неворсящейся with rags - they have to be perfectly pure.

Check of working gaps of radical bearings

Try not to touch surfaces of new inserts barehanded in order to avoid undesirable contact of bearings with always with the traces of oil and chemically aggressive substances which are present at fingers.


 PERFORMANCE ORDER

1. Wipe backs of new inserts of radical bearings and enclose the halves equipped with an oil flute in the beds in the block. Enclose the remained halves of inserts in the corresponding covers of bearings. Track that uvulas of inserts entered reciprocal landing grooves in beds of the block and covers. Oil openings in the block have to be the correct image combined with openings in inserts.

You make by no means attempts to begin to knock an insert resistant to installation in the bed the hammer. Grease with nothing bearings at this stage!

2. On SOHC engines equipped with flanges persistent an insert is established in a cover and a saddle of the 4th radical bearing. On DOHC engines the third bearing is persistent.
3. Wipe the surfaces of bearings in the block and radical necks of a bent shaft pure неворсящейся with rags.
4. Check passability of oil openings of a shaft, in case of need clean them. Any foreign particles which are contained in maslotoka, eventually, inevitably get to bearings.
5. Accurately lay carefully wiped bent shaft in radical bearings of the block (do not use any lubricant).
6. Before finalizing a shaft, it is necessary to check sizes of working gaps in its radical bearings.

7. Cut the calibrated plastic wire from the measuring Plastigage set pieces, length width of inserts are slightly shorter, and lay on one piece of a wire along each of radical necks of a shaft, parallel to their axis.

8. Wipe surfaces of inserts in covers and establish the last on the regular places (track correctness of orientation of marking). Try not to shift the pieces of the calibrated wire laid along shaft necks. Slightly oil a carving of fixing bolts and screw them, having recorded covers.
9. In the order specified on one of illustrations in three stages tighten bolts of fastening of covers with the required effort. Do not allow a shaft provorachivaniye in the course of tightening of fixture!

The condition of bolts of fastening of covers of radical bearings has to be previously carefully checked (see the Section Removal of a Bent Shaft) in order to avoid discrepancy of indications of a dynamometer key to true effort of tightening.

10. Turn out bolts and carefully uncover radical bearings. Put uncovered as an arrangement them on the engine. Try not to damage the flattened-out calibrated wire and do not turn a shaft. If any of covers does not give in to removal, for release accurately tap it the hammer with soft brisk.

11. Determine the size of working gaps of bearings by width of the flattened-out threads measured on the scale applied on packing of the Plastigage set. Compare results of measurements to requirements of Specifications.

12. If the size of a gap goes beyond admissible limits, perhaps, inserts not of that standard size were established (see the Section Check of a State and Selection of Inserts of Radical and Conrod Bearings of a Bent Shaft). Before looking for new inserts, make sure that under enclosed at this stage dirt or oil did not get. If the calibrated wire is flattened out since one end more than from another, it demonstrates existence of conicity of a neck (see the Section Check of a Condition of a Bent Shaft).
13. Carefully remove the flattened-out calibrated wire from necks, having scratched out all its traces some not too strong tool (for example, edge of an old credit card). As a last resort, it is possible to use own nail, - the main thing that on a surface of necks/inserts there is no scratch left and zadir.

Final installation of a bent shaft

 PERFORMANCE ORDER

1. Carefully take a bent shaft from the engine.
2. Wipe the surfaces of bearings in the block and evenly grease them with a thin layer of molibdensoderzhashchy or assembly motive lubricant. Do not forget to grease also persistent surfaces also.

Try not to allow hits of lubricant on backs of inserts!

3. Make sure of absoluteness of purity of necks of a bent shaft, then grease (the same lubricant or pure motive oil) the surfaces of pins contacting to epiploons. Lay a shaft on the regular place.
4. Wipe and grease inserts in covers of bearings.
5. Install covers of bearings on the engine (shooters towards the GRM drive).
6. Screw fixing bolts and tighten them with effort of 14 ÷ 16 Nanometers.
7. Knock on end faces of pins of a shaft with the hammer through a brass or lead drift for the purpose of alignment of persistent surfaces and shrinkage of a shaft before final tightening of fixture.
8. Tighten bolts of covers with the required effort.
9. Several times turn a bent shaft manually, checking freedom of its rotation.
10. In conclusion by means of the probe of lezviyny type or the DTI measuring instrument determine the size of an axial side play of a shaft (see the Section Removal of a Bent Shaft). If persistent surfaces of a shaft are not worn-out and are not damaged, and bearings are replaced on new, the size of a side play should not exceed the limit of admissible range.
11. Establish a new back epiploon of a bent shaft and a priboltita to the block his holder (see the Section Installation of a Back Epiploon of a Bent Shaft).