Nissan Maxima QX

since 1993 release

Repair and operation of the car



Nissan Maxima QX
+ Cars of the Nissan Maxima brand
+ Maintenance instruction
+ Settings and routine maintenance
- Engine
   + SOHC engines
   - DOHC engines
      General information
      Preparatory actions and the list of repair procedures which can be executed without extraction of the engine from the car
      Reduction of the piston of the first cylinder in the provision of the top dead point (TDP)
      Removal and installation of covers of heads of cylinders
      Check and adjustment of gaps of valves
      Replacement of maslootrazhatelny caps and valvate springs with plates
      Removal, check of a state and installation of a chain and asterisks of the GRM drive
      Removal and installation of camshafts and pushers of valves
      Removal and installation of the inlet pipeline
      Removal and installation of final collectors
      Removal and installation of heads of cylinders
      Removal and installation of a pulley of a bent shaft
      Replacement of a forward epiploon of a bent shaft
      Removal and installation of the pallet of a case of the engine
      Removal, check of a state and installation of the oil pump
      Removal and installation of a flywheel / driving disk
      Replacement of a back epiploon of a bent shaft
      Check of a state and replacement of support of a suspension bracket of the power unit
   + General capital repairs of the engine
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



Check and adjustment of gaps of valves

Implementation of this procedure will require the special tool, - ask in shops of automobile accessories.


 PERFORMANCE ORDER

1. Disconnect a negative wire from the battery.

If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action!

2. Uncover a head of cylinders (see the Section Removal and installation of covers of heads of cylinders).
3. On models with RKPP cock the parking brake and choose neutral transfer.
4. Turn out spark plugs (see the Head Nastroyki and routine maintenance).
5. Bring the piston of the first cylinder into the provision of VMT of the end of a step of compression, - track correctness of combination of adjusting tags (see the Section Reduction of the Piston of the First Cylinder in the provision of the top dead point (TDP)).
6. Measure gaps of the corresponding valves. Write down results of measurements and compare them to requirements of Specifications. Mark valves which gaps exceed the limit of admissible range.

7. Turn a bent shaft in the normal direction (clockwise) on 240 °C the reduction purpose in the provision of VMT of the piston of the third cylinder and measure gaps of valves of the next set.

8. Turn a shaft for 240 ° (VMT of the 5th cylinder) and check gaps of the remained valves.

9. Having finished measurement, turn a pulley of a bent shaft so that the cam of the drive of the first of the valves which are subject to adjustment was developed by a working ledge up (from a pusher).

10. Develop an adjusting washer an opening to the central part of casting of a head of cylinders. Establish special nippers so that their top sponges covered a shaft at a cam cheek, and lower rested against washer top. Squeeze handles of nippers and deploy the tool from the camshaft aside, wringing out a pusher. Pass a sting of the second special tool throughout a gap between edge of a pusher and the camshaft, then release a pusher. For extraction of an adjusting washer it is possible to use tweezers (raise washers the screw-driver) or the magnetized core.

Supply of compressed air in an opening will help with a washer to its extraction.

11. Measure thickness of the removed washer by means of a micrometer or the caliper equipped with a vernier scale (see an accompanying illustration). For calculation of thickness of a new washer which has to be established on a pusher for the purpose of correction of a valvate gap it is made on the following formula:

Inlet valves: N = R + (M - 0.30 mm)
Final valves N = R + (M - 0.33 mm)


Where:

R - Thickness of an old washer in millimeters
M - the Measured valvate gap in millimeters
N - Thickness of a new washer in millimeters

12. Pick up a new washer, such that its thickness as it is possible closer corresponded to the required value. Washers of 64 sizes with a step of 0.01 mm in the range from 2.32 mm to 2.95 mm are issued.

The washer removed from a pusher of one valve can approach as new to correction of a gap of another, - make the corresponding calculations before you go behind new washers.

13. Working in a manner similar described in paragraph 10, serially establish the new picked-up washers on pushers of the corresponding valves.
14. Make sure of correctness of adjustment of valvate gaps (see above), in case of need make repeated selection of washers.
15. Assembly to a head is made as it should be the return to an order of dismantle of components.