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
 












4-18-sborka-golovki-cilindrov.html

4.18. Assembly of a head of cylinders

Regardless of that, the head went to a workshop for carrying out service of valves, or not, before starting its assembly, once again carefully check purity of all components.

After head return from a workshop in it valves with accompanying components will be already established. In this case it is necessary to lower corresponding of listed below procedures and at once to pass to installation of shaft and assemblies of yokes.

 PERFORMANCE ORDER

  1. First of all establish on directing plugs of valves of a saddle of their springs, then put on each of directing plugs a new maslootrazhatelny cap (see. Dismantling and check of a condition of a head of cylinders and components of the klapanny mechanism). Maslootrazhatelnye caps (inlet and final valves) "are put" on the directing plugs by a careful zastukivaniye by a hammer through a special opravka or a face head of the suitable size.

Stop a cap zastukivaniye right after that as it completely "will sit down" on the plug - further blows can lead to rubber damage. Track, that caps did not appear are overwound on plugs.

  1. Moving from one end of a head to another, grease with molibdensoderzhashchy or assembly impellent greasing the first valve and plant it in a head. A core of the valve grease with pure impellent oil.
  2. By means of a noniusny calliper serially check adjusting height of cores of each of valves (distance from a saddle of springs to a face surface of a core of the valve) (see. Dismantling and check of a condition of a head of cylinders and components of the klapanny mechanism).

If repair of a head was made in a car-care center workshop, this parameter already will be adjusted properly. If the result any of measurements exceeds admissible value according to Specifications, replace the corresponding valve and repeat check. If replacement of the valve does not lead to situation correction, therefore, the valve saddle too deeply is planted in a head and the last is subject to replacement.

  1. Plant on a core klapanny springs and their plate.

Springs are established to Klapannye by rounds with the truncated step to a head.

  1. The special tool compress springs, having lowered a plate, then plant in the opened flute on a valve core crackers of the cutting lock.
  1. For the purpose of temporary fixing of crackers to an otpuskaniye of the tool grease them from the inside with dense greasing.
  1. Repeat procedure for the remained valves. Watch that all components were established strictly on the former places.
  2. Camshaft installation (ов) and assemblies of yokes is made after the head will be completed in the reduced set (see. Alternative versions of schemes of regenerative repair of the engine).


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4.17. Recommendations about service of valves
on the following page»
4.19. Removal of shatunno-piston assemblies