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
 












4-18-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, carefully double-check purity of all components.

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

 PERFORMANCE ORDER

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

Stop a cap zastukivaniye right after that as he completely "will get" on the plug - further blows can lead to rubber damage. Track that caps were not overwound on plugs.

  1. Moving from one end of a head to another, grease with molibdensoderzhashchy or assembly motive lubricant the first valve and put him in a head. Oil a core of the valve pure motive.
  2. By means of a vernier caliper serially check the 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 valvate mechanism).

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

  1. Put valvate springs and their plate on a core.

Valvate springs are established by rounds with the shortened step to a head.

  1. The special tool squeeze springs, having lowered a plate, then put 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 lubricant.
  1. Repeat the procedure for the remained valves. You watch that all components were installed strictly on the former places.
  2. Installation of the camshaft(s) and assemblies of yokes is made after the head is completed in the reduced set (see. Alternative versions of schemes of recovery repair of the engine).


"on the page back
4.17. Recommendations about service of valves
on the following page"
4.19. Removal of conrod and piston assemblies