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
 












4-30-ustanovka-shatunno-porshnevykh-sborok-i-proverka-velichiny-rabochikh-zazorov.html

4.30. Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft

 PERFORMANCE ORDER

  1. Before installation of conrod and piston assemblies of a wall of cylinders have to be carefully wiped, from their upper edges traces of step wear are completely removed and it is chamfered. It is meant that the bent shaft is already installed on the regular place in the block.
  2. Uncover the lower head of a rod of the piston of the first cylinder (make sure available the factory or put in the course of dismantle tags). Take inserts of the old bearing from a head of a rod and its cover and carefully wipe their beds pure неворсящейся with rags.


Check of a working gap of the conrod bearing

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 a back of a new top insert and put it to bed the bearing in a rod head. Track that the directing uvula of an insert got to a reciprocal flute in a rod. At all not to a zastukivayta an insert in a bed the hammer. Grease with nothing the bearing at this stage.
  2. Wipe a back of the second insert and lay it in a cover of the lower head of a rod. Again track that the uvula got to a reciprocal groove. Do not apply any lubricant — extremely important that the interfaced surfaces of the bearing and a rod remained absolutely pure and dry.
  1. Arrange piston rings locks, as shown.

Have no locks of rings to coaxially piston finger AT ALL, or perpendicular to its axis!

  1. Grease the piston and piston rings with pure motive oil.
  2. Put on the piston a tool mandrel for a staving of rings. Leave a skirt of the piston acting from a tool mandrel approximately on 6.4 mm for free gas station it in the cylinder. Rings have to be pressed out aflush with the forming surface of the piston.
  3. Turn a bent shaft so that the neck of the first crank fell into NMT state. Oil motive a mirror of the first cylinder.
  1. Having developed assembly by a forward tag in the form of deepening or an arrow on the piston bottom on the engine forward, accurately pass a rod throughout the first cylinder of the block. Fill a piston skirt in the cylinder, having densely pressed to the surface of the block bottom edge of a mandrel of the tool for a staving of rings.
  1. Tap the upper edge of a mandrel for a guarantee of density of pressing it to the block on all perimeter of bottom edge.
  1. Accurately tapping on the piston bottom with the wooden handle of the hammer, enter the piston in the cylinder, at the same time directing the lower head of a rod to a neck of the corresponding crank of a bent shaft. Piston rings can unexpectedly jump out from under a tool mandrel therefore constantly you watch pressing density to its block. Act without hurrying, at emergence of the slightest resistance immediately stop a piston zastukivaniye. Find out the reason of jamming and eliminate it. Do not make at all attempts to push the piston in the cylinder by force — it can lead to its mechanical damage or destruction of piston rings.
  1. After introduction of conrod and piston assembly to the engine, before final installation of a cover of the lower head of a rod, it is necessary to check a working gap of the conrod bearing of a bent shaft.
  1. Cut off a piece of the calibrated plastic wire from the measuring Plastigage set, length width of an insert of the conrod bearing are slightly shorter, and lay it along the first conrod neck of a bent shaft, parallel to an axis of the last.
  1. Wipe the surface of the bearing in a cover of the lower head of a rod and establish a cover on a rod. Track that the tag on a cover was turned in the same party, as a tag on a rod.
  2. Return bolts of fastening of a cover and in three stages tighten them with the required effort.

In order to avoid jamming of a key, use a thin-walled face head. At emergence of signs of jamming of a key between a head of a bolt and a rod, slightly raise a head and continue tightening. Do not allow a provorachivaniye of a bent shaft in the course of implementation of all procedure.

  1. Turn out bolts and carefully uncover a rod. Try not to damage the flattened-out piece of the calibrated wire.
  1. Determine the size of a working gap in the bearing by width of the flattened-out wire measured on the scale printed on packing to the Plastigage set. Compare result of measurement to requirements of Specifications.
  1. Alternatively working gaps in conrod bearings can be determined by a calculation method by carrying out measurements of diameters of conrod 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 diameter of the conrod bearing
    B — Measurement of diameter of a conrod neck of a bent shaft

A.

B.
  1. If the size of a gap exceeds the limit of admissible range before looking for inserts of other standard size, check whether got under backs enclosed in beds in a rod and a cover of inserts dirt / oil. Once again measure diameter of a neck of a shaft. The wire flattening since one end more than from another speaks about existence of conicity of a neck.


Final installation of conrod and piston assembly

 PERFORMANCE ORDER

  1. Carefully scratch out a nail or edge of an old credit card all traces of the calibrated wire from the surface of a neck and/or the bearing.
  2. Make sure of absoluteness of purity of both bearing surfaces, then evenly grease them with a thin layer of molibdensoderzhashchy assembly motive lubricant. For ensuring access to a surface of the top insert it is necessary to push a little the piston in the cylinder — do not forget to put on rod cover bolts protective hoses in order to avoid damage of a surface of a neck of a shaft. Try not to allow vyskakivaniye from the cylinder of piston rings.
  3. Return a rod into place, having carefully put on it the lower head a neck of the crank, remove protective hoses from bolts, establish a cover, and in three stages tighten fixing nuts with the required effort.

Track correctness of combination of tags on a cover of a rod and its lower head.

  1. Repeat all procedure for the remained conrod and piston assemblies.
  2. Do not lose sight of the next important points:
    • You watch that on backs of inserts and their bed in rods and covers dirt did not get;
    • You watch that each assembly was established in the cylinder (even in case of installation of new components as gaps of piston rings were adjusted to concrete cylinders);
    • Pistons have to settle down a tag / arrow on the bottom on the engine forward (towards the GRM drive);
    • Do not forget to oil before installation of assemblies motive mirrors of cylinders;
    • Do not forget to grease bearings (after check of working gaps in the last) before final installation of covers.
  3. Having finished installation of conrod and piston assemblies, check freedom of rotation of a bent shaft, having turned it several times manually.
  4. In conclusion it is necessary to double-check an axial side play of a bent shaft (see Installation of a bent shaft and check of working gaps of radical bearings).
  5. Compare results of measurement of an axial side play to requirements of Specifications. If the side play was normal before dismantling of the engine and old conrod and piston assemblies are used, no surprises should be. In case of a side play size exit out of admissible limits after replacement of rods, the last need to be removed from the engine and to give to a workshop of car service for the corresponding machining.


"on the page back
4.29. Installation of a bent shaft and check of working gaps of radical bearings
on the following page"
4.31. Trial start and a running in of the engine after capital repairs