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
 












4-19-snyatie-shatunno-porshnevykh-sborok.html

4.19. Removal of conrod and piston assemblies

Before starting extraction from the engine of conrod and piston assemblies, it is necessary to remove a head (i) of cylinders, the pallet of a case and the oil pump with a maslozaborny tube.


 PERFORMANCE ORDER

  1. By means of a special vertical drill completely remove traces of step wear from the top part of cylinders — act according to the instructions of the manufacturer attached to a vertical drill. The step is formed on piston stroke border, approximately in 6.4 mm under the top cut of the cylinder due to mechanical production of metal and a nagaroobrazovaniye, it is possible to determine its existence to the touch by a finger nail. Attempts of extraction of conrod and piston groups without removal of step development are fraught with damage of pistons.
  1. Having finished preparation of cylinders, turn the engine upside down so that the bent shaft appeared from above.
  2. Before removing rods from a bent shaft, estimate the size of their axial side play on necks of the last. Densely enter an edge(s) of the measuring probe into a gap between a sidewall of the lower head of a rod and a cheek of a crank, having completely chosen a rod side play on a shaft neck. Total thickness of the picked-up probe edges will also equal to the size of an axial side play of a rod. Compare result of the taken measurement to requirements of Specifications. If the size of an axial side play exceeds extreme admissible value, this rod is subject to replacement. The axial side play of a new rod, or old on new to a shaft, can appear less than the lower admissible limit, in this case the rod can be pierced — consult with specialists of car service. Serially check all remained rods.
  3. Remove assembly of covers of radical bearings (see Removal of a bent shaft).
  1. Make sure available on the lower heads of rods and their covers of identification tags of belonging to the cylinder — do not mix number of a rod with marking of the size of the conrod bearing (see Check of a condition of components of conrod and piston group). In stages (on 1/2 turns for approach) weaken nuts of fastening of covers of the lower heads of rods so that the possibility of their otvorachivaniye manually appeared. Uncover the first rod together with the bearing insert placed in it — try not to drop the last.

    A — Number is beaten out on a joint of the lower head of a rod with its cover with number of the cylinder — this marking serves for determination of the size of a bearing opening in a head
    B — Marking of accessory of a rod (and covers of its lower head) to a certain cylinder should be put independently by means of a center punch before extraction of assemblies

A.

B.
  1. Take an insert from the lower head of a rod, then, having rested the wooden handle of the hammer against a bearing bed in the lower head, push out conrod and piston assembly at the top of the cylinder at the top of the block. At emergence of resistance immediately stop extraction of assembly and check completeness of removal of step wear in the top part of the cylinder.
  2. In a similar manner take the remained conrod and piston assemblies from the engine.

Installation of the rod which is subject to extraction coaxially to the cylinder is made by the corresponding provorachivaniye of a bent shaft — start extraction only after the rod is located strictly parallel to a cylinder axis!

  1. In order to avoid casual mechanical damage of bearings and loss of components, establish into place inserts and fix covers of bearings on lower heads of the rods, having by hand tightened nuts.


"on the page back
4.18. Assembly of a head of cylinders
on the following page"
4.20. Removal of a bent shaft