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

 PERFORMANCE ORDER

1. Installation of a cranked shaft is the first step of procedure actually engine assemblies. It is meant that at this stage the cranked shaft and the engine block already are properly cleaned, checked and subjected to necessary regenerative repair.
2. Overturn the engine upside down.
3. Give fixing bolts, remove covers of radical bearings and spread out them on a workbench as installation on the engine.
4. If yet did not do it, take from the beds in the block and covers old loose leaves of radical bearings. Wipe beds pure неворсящейся rags - they should be irreproachably pure.

Check of working gaps of radical bearings

Try not to touch surfaces of new loose leaves barehanded in order to avoid undesirable contact of bearings to traces of oil always present on fingers and chemically aggressive substances.


 PERFORMANCE ORDER

1. Wipe backs of new loose leaves of radical bearings and enclose the halves equipped with an oil flute in the beds in the block. The remained halves of loose leaves enclose in the corresponding covers of bearings. Track, that uvulas of loose leaves entered into reciprocal landing grooves in beds of the block and covers. Oil openings in the block should appear correctly combined with openings in loose leaves.

By no means make attempts to begin to knock the loose leaf resistant to installation in the bed a hammer. Grease with nothing bearings at this stage!

2. On SOHC engines equipped with flanges persistent the loose leaf is established in a cover and a saddle of the 4th radical bearing. On DOHC engines the third bearing is persistent.
3. Wipe surfaces of bearings in the block and radical necks of a cranked shaft pure неворсящейся rags.
4. Check passableness of oil openings of a shaft, in case of need clean them. Any containing in маслотоках extraneous particles, eventually, inevitably get to bearings.
5. Carefully wiped cranked shaft accurately lay in radical bearings of the block (do not use any greasing).
6. Before establishing a shaft finally, it is necessary to check sizes of working gaps in its radical bearings.

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

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

The condition of bolts of fastening of covers of radical bearings should be carefully checked previously (see. The section Removal of a cranked shaft) in order to avoid discrepancy of indications of a dinamometrichesky key to true effort of a tightening.

10. Turn out bolts and carefully remove covers of radical bearings. Combine the removed covers 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 it is accurate обстучите its hammer with soft the brisk.

11. On the width of the flattened-out threads measured on a scale, put on packing of a set of Plastigage, define size of working gaps of bearings. Compare results of measurements to requirements of Specifications.

12. If the size of a gap leaves out of admissible limits, probably, loose leaves not that standard size (were established see. Section Check of a condition and selection of loose leaves of radical and shatunny bearings of a cranked shaft). Before looking for new loose leaves, 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 testifies to existence of a konusnost of a neck (see. Section Check of a condition of a cranked shaft).
13. Carefully remove the flattened-out calibrated wire from necks, having scratched out all its traces any 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/loose leaves did not remain scratches and задиров.

Final installation of a cranked shaft

 PERFORMANCE ORDER

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

Try not to allow greasing hits on backs of loose leaves!

3. Make sure of absoluteness of purity of necks of a cranked shaft, then grease (the same greasing or pure impellent oil) surfaces of pins contacting to epiploons. Lay a shaft on the regular place.
4. Wipe and grease loose leaves in covers of bearings.
5. Establish covers of bearings on the engine (shooters towards 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 a hammer through a brass or lead drift for the purpose of alignment of persistent surfaces and a shaft usadka before a final tightening of fixture.
8. Tighten bolts of covers with demanded effort.
9. Several times turn a cranked shaft manually, checking freedom of its rotation.
10. In summary with the help щупа lezviyny type or a measuring instrument of DTI define size axial люфта in bulk (see. Section Removal of a cranked shaft). If persistent surfaces of a shaft are not worn-out and are not damaged, and bearings are replaced on new, the size люфта should not fall outside the limits an admissible range.
11. Establish a new back epiploon of a cranked shaft and приболтите to the block his holder (see. Section Installation of a back epiploon of a cranked shaft).