Infiniti QX4 service since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
4.1. Specifications
4.2. Check of kompressionny pressure in cylinders
4.3. Diagnostics of a condition of the engine with use of the vacuum gage
4.4. Removal and engine installation
4.5. Removal and installation of the inlet pipeline
4.6. Replacement of a belt of a drive of GRM
4.7. Removal, check of a condition and installation of a head of cylinders
4.8. Replacement of a forward epiploon of a cranked shaft
4.9. Removal, check of a condition and installation of components of the klapanny mechanism
4.10. Replacement of epiploons of camshafts
4.11. Replacement of a back epiploon of a cranked shaft
4.12. Removal and installation of the pallet of a case
4.13. Removal, service and installation of the oil pump
4.14. Alternative versions of schemes of regenerative repair of the engine
4.15. An order of dismantling of the engine by its preparation for major maintenance
4.16. Dismantling and check of a condition of a head of cylinders and components of the klapanny mechanism
4.17. Recommendations about service of valves
4.18. Assembly of a head of cylinders
4.19. Removal of shatunno-piston assemblies
4.20. Removal of a cranked shaft
4.21. Cleaning of the block of the engine
4.22. Check of a condition of the block of the engine
4.23. Honingovaniye of mirrors of cylinders
4.24. Check of a condition of components of shatunno-piston group
4.25. Check of a condition of a cranked shaft
4.26. Check of a condition and selection of loose leaves of radical and shatunny bearings of a cranked shaft
4.27. Engine assembly order
4.28. Installation of piston rings
4.29. Installation of a cranked shaft and check of working gaps of radical bearings
4.30. Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft
4.31. Trial start and an engine running in after major maintenance
5. Cooling and heating systems
6. Power supply systems and managements
7. Start and charge systems
8. Transmission line
9. Brake system
10. Suspension bracket and steering
11. Body
12. Electric equipment
 












4-29-ustanovka-kolenchatogo-vala-i-proverka-rabochikh-zazorov-korennykh-podshipnikov.html

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

Installation of a cranked shaft is the first step actually engine assemblies. It is meant that at this stage the cranked shaft and the engine block already are properly cleaned, checked and restored.

 PERFORMANCE ORDER

  1. Overturn the engine upside down.
  2. Give fixing bolts and remove assembly of covers of radical bearings.
  3. 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 — remember that the bearing No. 4 is persistent. 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 also correctly are combined with openings in loose leaves.

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

  1. Wipe surfaces of bearings in the block and radical necks of a cranked shaft pure неворсящейся rags. 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.
  2. Carefully wiped cranked shaft accurately lay in radical bearings of the block.
  3. Before establishing a shaft finally, it is necessary to check sizes of working gaps in its radical bearings.
  1. 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.
  1. Wipe surfaces of loose leaves in covers and establish assembly of the last on the regular place — 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.
  2. Operating as it should be, the return to an order of an otpuskaniye of bolts (see an illustration the Order of an otpuskaniye of bolts of fastening of assembly of covers of radical bearings), in some stages tighten bolts of fastening of assembly of covers with demanded effort (see. Specifications).

Do not allow a shaft provorachivaniye in the course of a fixture tightening!

  1. Turn out bolts and carefully remove assembly of covers of radical bearings — 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, it is accurate обстучите it for release by a hammer with soft the brisk.
  1. Till 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.
  1. If the size of a gap leaves out of admissible limits, probably, loose leaves not that standard size (were established see. 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.
  2. Carefully remove the 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.
  1. Alternatively working gaps in radical bearings can be defined by a calculation method by carrying out measurements of diameters of radical necks a shaft and internal diameters of bearings (loose leaves are laid in a bed, assembly of covers is established, the shaft — is not present).

    A — Measurement of diameters of radical bearings in block assembly
    B — Measurement of diameters of radical necks of a cranked shaft

A.

B.
  1. If reduction of working gaps in norm by selection of loose leaves of the standard size is not obviously possible, the shaft should is as appropriate pierced, and loose leaves are replaced with the repair.

The pro-point of a shaft should be made taking into account the minimum admissible size galtel. At a pro-point of a cranked shaft depth galtel of L should not appear less than 0.1 mm.


Final installation of a cranked shaft

 PERFORMANCE ORDER

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

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

  1. Make sure of absoluteness of purity of necks of a cranked shaft, then grease (the same greasing) surfaces of pins contacting to epiploons and accurately lay a shaft in the block.
  2. Wipe and grease surfaces of loose leaves in the block and covers.
  3. Having developed the block in bulk up, fill in it shatunno-piston assemblies (see. Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft).
  4. Establish on the engine assembly of covers of radical bearings.
  5. Slightly oil a carving part and the bottom surfaces of heads of fixing bolts, then screw the last and tighten them by hand. Operating as it should be, the return to an order of an otpuskaniye of bolts (see an illustration the Order of an otpuskaniye of bolts of fastening of assembly of covers of radical bearings), in some stages tighten bolts of fastening of assembly of covers with demanded effort (see. Specifications).
  6. Several times turn a cranked shaft manually, checking freedom of its rotation.
  7. In summary with the help щупа lezviyny type or a tsiferblatny measuring instrument of plunzherny type define size axial люфта in bulk (see. 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, axial люфт should not fall outside the limits an admissible range.
  8. Establish a new back epiploon of a cranked shaft and приболтите to the block his holder (see. Replacement of a back epiploon of a cranked shaft).


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4.28. Installation of piston rings
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4.30. Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft