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
 












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4. Engine

This Head is devoted to the description of procedures of service and capital repairs of the 3.3 l 6-cylinder V-shaped engine equipped with system of the distributed fuel injection.

Each of heads of cylinders of the engine is equipped with two camshafts of the top arrangement (DOHC) operating functioning of a 24-ta of valves (on 4 on each of cylinders). The engine has a compact design which main component are made of light aluminum alloy the block also heads of cylinders.

The bent shaft is put in 4 radical bearings which covers are united in monolithic assembly. The fourth radical bearing is persistent and in addition controls an axial side play of a shaft.

Pistons are equipped two compression and one oil scraper with rings. The piston fingers having semi-floating landing are pressed in the top heads of rods. In the lower heads replaceable inserts of conrod bearings are located.

The engine has liquid cooling on the basis of the centrifugal rotor pump put in action from a gear belt. Cooling liquid circulates on internal galleries of the engine, washing cylinders and combustion chambers, and also is banished on the channels equipped in the inlet pipeline.

Supply of lubricant to internal components of the engine is carried out by the gear oil pump located in a forward part of the engine under a cover of a gas-distributing belt. The drive of an internal gear wheel of the pump is carried out directly from a bent shaft. Oil is sucked in via the mesh filter from the case pallet, then banished via the full-line filter of cartridge type.


The list of the repair work performed without extraction of the engine from the car

The listed below following repair work can be performed without removal of the engine from the car:

  • Check of compression pressure;
  • Removal and installation of a cover of the gas-distributing mechanism;
  • Removal and installation of a cover of the GRM drive;
  • Removal and installation of components of the GRM drive (belts / chains, gear wheels / asterisks);
  • Removal and installation of camshafts and components of the drive of valves;
  • Removal and installation of heads of cylinders;
  • Removal and installation of pistons with rods *;
  • Removal and installation of the pallet of a case;
  • Removal, recovery repair and installation of the oil pump;
  • Removal and installation of the oil cooler;
  • Replacement of epiploons of a bent shaft;
  • Check of a state and replacement of support of a suspension bracket of the power unit;
  • Removal, check of a state and installation of a driving disk

* Though after removal of a head of the block and the pallet (without removing the engine) there is a possibility of dismantle of conrod and piston assemblies, it is not necessary to abuse such opportunity in view of the difficulties connected with need of respect for purity and carrying out a number of preparatory procedures. In view of told, the description of this procedure is provided further in the text of the present Chapter.

Before works make careful cleaning of a motive compartment and the external surfaces of the power unit with application of one of a wide range of special solvents. Such processing will allow to avoid hit of dirt in the engine.

In case of need, the forthcoming work determined by character, it is possible to remove a cowl for the purpose of ensuring freedom of access to the components which are subject to service — in order to avoid casual damage of a paint and varnish covering cover car wings with special covers, or just old blankets.


"on the page back
3.19. Greasing of locks, loops and emphasis
on the following page"
4.1. Specifications




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