Service of the Infiniti QX4 since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
4.1. Specifications
4.2. Check of compression pressure in cylinders
4.3. Diagnostics of a condition of the engine with use of the vacuum gage
4.4. Removal and installation of the engine
4.5. Removal and installation of the inlet pipeline
4.6. Replacement of a belt of the GRM drive
4.7. Removal, check of a state and installation of a head of cylinders
4.8. Replacement of a forward epiploon of a bent shaft
4.9. Removal, check of a state and installation of components of the valvate mechanism
4.10. Replacement of epiploons of camshafts
4.11. Replacement of a back epiploon of a bent 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 recovery repair of the engine
4.15. An order of dismantling of the engine by preparation it to capital repairs
4.16. Dismantling and check of a condition of a head of cylinders and components of the valvate mechanism
4.17. Recommendations about service of valves
4.18. Assembly of a head of cylinders
4.19. Removal of conrod and piston assemblies
4.20. Removal of a bent 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 conrod and piston group
4.25. Check of a condition of a bent shaft
4.26. Check of a state and selection of inserts of radical and conrod bearings of a bent shaft
4.27. Engine assembly order
4.28. Installation of piston rings
4.29. Installation of a bent shaft and check of working gaps of radical bearings
4.30. Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft
4.31. Trial start and a running in of the engine after capital repairs
5. Cooling system and heating
6. Feed and control systems
7. Systems of start and charge
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 bent shaft and check of working gaps of radical bearings

Installation of a bent shaft is the first step 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 restored.

 PERFORMANCE ORDER

  1. Turn the engine upside down.
  2. Give fixing bolts and remove assembly of covers of radical bearings.
  3. 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 — you remember that the bearing No. 4 is persistent. Track that uvulas of inserts entered reciprocal landing grooves in beds of the block and covers. Oil openings in the block have also to correctly are combined with openings in inserts.

Do 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!

  1. Wipe the surfaces of bearings in the block and radical necks of a bent shaft pure неворсящейся with rags. 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.
  2. Accurately lay carefully wiped bent shaft in radical bearings of the block.
  3. Before finalizing a shaft, it is necessary to check sizes of working gaps in its radical bearings.
  1. 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.
  1. Wipe surfaces of inserts in covers and establish assembly of the last on the regular place — 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.
  2. Working as it should be, the return to an order of an otpuskaniye of bolts (see the illustration Order of an Otpuskaniye of Bolts of Fastening of Assembly of Covers of Radical Bearings), in several stages tighten bolts of fastening of assembly of covers with the required effort (see Specifications).

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

  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, accurately tap it for release by the hammer with soft brisk.
  1. 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.
  1. If the size of a gap goes beyond admissible limits, perhaps, inserts not of that standard size were established (see 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.
  2. Carefully remove the 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.
  1. Alternatively working gaps in radical bearings can be determined by a calculation method by carrying out measurements of diameters of radical necks a shaft and internal diameters of bearings (inserts are laid in a bed, assembly of covers is established, the shaft — is not present).

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

A.

B.
  1. If reduction of working gaps in norm by selection of inserts of the standard size is not possible, the shaft has to is appropriately pierced, and inserts are replaced by repair.

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


Final installation of a bent shaft

 PERFORMANCE ORDER

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

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

  1. Make sure of absoluteness of purity of necks of a bent shaft, then grease (the same lubricant) the surfaces of pins contacting to epiploons and accurately lay a shaft in the block.
  2. Wipe and grease surfaces of inserts in the block and covers.
  3. Having deployed the block in bulk up, fill in it conrod and piston assemblies (see Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft).
  4. Install assembly of covers of radical bearings on the engine.
  5. Slightly oil a carving part and the lower surfaces of heads of fixing bolts, then screw the last and tighten them by hand. Working as it should be, the return to an order of an otpuskaniye of bolts (see the illustration Order of an Otpuskaniye of Bolts of Fastening of Assembly of Covers of Radical Bearings), in several stages tighten bolts of fastening of assembly of covers with the required effort (see Specifications).
  6. Several times turn a bent shaft manually, checking freedom of its rotation.
  7. In conclusion by means of the probe of lezviyny type or the dial measuring instrument of plunger type determine the size of an axial side play of a shaft (see 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 axial side play should not exceed the limit of admissible range.
  8. Establish a new back epiploon of a bent shaft and a priboltita to the block his holder (see Replacement of a back epiploon of a bent shaft).


"on the page back
4.28. Installation of piston rings
on the following page"
4.30. Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft