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
      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
      Removal, check of a state and installation of assembly of yokes
      Replacement of maslootrazhatelny caps and valvate springs with plates
      Removal and installation of a gas-distributing belt and cogwheels 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
   + DOHC engines
   + 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



Removal and installation of a gas-distributing belt and cogwheels of the GRM drive

REMOVAL

 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. Weaken nuts of fastening of the right forward wheel. Cock the parking brake and prop up back wheels antiretractable boots.
3. A car front also establish to Poddomkratta it on props.
4. Remove the right forward wheel and a loker of protection of his arch (see the Head Kuzov).
5. Take off all driving belts (see the Head Nastroyki and routine maintenance).
6. Remove protection of a case and empty the cooling system (see the Head Nastroyki and routine maintenance).
7. Turn out spark plugs (see the Head Nastroyki and routine maintenance). Bring the piston of the first cylinder into the provision of VMT of the end of a step of compression (see the Section Reduction of the Piston of the First Cylinder in the provision of the top dead point (TDP)).
8. Disconnect radiator and perepuskny hoses from a thermostat casing. Remove a pulley of the water pump.

9. Shoot an intermediate video of a belt of the drive of the K/V compressor with the arm.

10. Remove a pulley of a bent shaft (see the Section Removal and installation of a pulley of a bent shaft).

Do not allow a provorachivaniye of a bent shaft in the course of dismantle of a pulley as it will lead to an engine conclusion from the provision of VMT.

11. Release an electrical wiring and hoses from clamps on the top cover of a gas-distributing belt.

12. Remove pins of a bent shaft a guide of a gas-distributing belt, then turn out bolts of fastening of the top and lower covers of a belt. Draw the attention of An the fact that for fastening of covers bolts of various standard size which at assembly have to be rolled strictly on the former places are used, - apply the corresponding marking on a head of bolts.

13. Make sure that the piston of the first cylinder is in the provision of VMT of the end of a step of compression, - tags on cogwheels distributive and cranked shaft have to be combined correctly with response indexes.

14. Having released half way a lock nut and having developed a natyazhitel on 70 ÷ 80 degrees clockwise, weaken effort of a tension of a gas-distributing belt.

15. Check a belt for existence on it of the marking indicating the direction it orientation at installation the engine. In case of need put the corresponding marking independently by means of chalk or paint.

This requirement makes sense only in case the old belt is not replaced. Take off a belt from cogwheels of the GRM drive and attentively examine on existence of cracks, signs of wear, pollution traces oil or cooling liquid. In case of need replace a belt. Estimate degree of wear of assembly of a natyazhitel with a spring, make sure of smoothness of rotation of a roller.

16. Estimate a condition of cogwheels, - in case of identification of signs of excessive wear or mechanical damages replace wheels.

Need with dismantle of cogwheels arises only in case of their damage, and also for the purpose of ensuring access to other components, for example, when replacing heads of cylinders, the oil pump, a forward epiploon of a bent shaft, or back cover of a gas-distributing belt.

17. Having passed the screw-driver throughout an opening in a camshaft cogwheel, block it from a provorachivaniye and release a fixing bolt.

18. After the bolt is turned out, the cogwheel has to be removed from a shaft pin manually.

Cogwheels of the right and left camshafts are not interchangeable and are marked with the corresponding marking.

19. The description of the procedure of replacement of a cogwheel of a bent shaft is provided in the Section Replacement of a Forward Epiploon of a Bent Shaft.

INSTALLATION

 PERFORMANCE ORDER

1. Make sure that the prepared new belt conforms according to the tiporazmerny characteristics to requirements of the engine of your car. On new belts three markings of white color which existence allows to simplify substantially the procedure of landing of components and alignment of their rather adjusting tags are usually provided.

Make sure also that the geometry of teeths of a belt corresponds to a design of cogwheels of the GRM drive. On some models of early years of release bottom edges the protocheck between teeths of wheels can have a rectangular shape, on others they are rounded. - teeths of a belt have to have the corresponding form. Violation of this requirement leads to increase in a noise background during the operation of the engine and to premature wear of a belt.

2. If removed a natyazhitel, establish him into place, having tracked correctness of landing of a spring. Prepare for installation of a belt for what develop a natyazhitel clockwise by means of a prutkovy key. Temporarily record a natyazhitel in this situation, having tightened a lock nut.

3. Watching correctness of combination of adjusting tags, throw with a belt GRM drive cogwheels. Moving counterclockwise and trying not to leave a weak point, at first put on a belt a wheel of a bent shaft, then throw with it a wheel of the left (forward) camshaft, then pull it on a wheel of the right (back) camshaft. In conclusion get a belt under a roller of a natyazhitel.

4. Manually choose a belt weak point from a natyazhitel, then weaken a nut of the last and develop assembly under 70 ÷ 80 degrees counterclockwise. Tighten a lock nut. Make sure of correctness of combination of all three sets of adjusting tags, and also that the belt is put on by the correct party forward.

5. Slowly turn a bent shaft clockwise on two whole revolutions, in conclusion again having returned it to the provision of VMT of the end of a step of compression.

Excessive resistance of a shaft to a provorachivaniye says that pistons make contact with valves and before continuing a shaft provorachivaniye, it is necessary to return to a starting position and to make the corresponding updating of the provision of VMT.

6. Densely (with effort about 10 kgfs) having pressed a belt on the site exactly in the middle between cogwheels of camshafts, measure the size of its deflection. The required value has to lie in the range between 13 and 15 mm.

7. If the size of a deflection does not exceed the limit of admissible range, the effort of a tension of a belt can be considered adjusted correctly, otherwise, it is necessary to weaken a lock nut of a natyazhitel and to make the corresponding adjustment (see below).

At correction of a tension of a belt not of superfluous help of the assistant will be given.

8. Bring an edge of the measuring probe 0.35 mm thick to a gap between a belt and a roller of a natyazhitel according to the scheme given on an illustration, - for retraction of the probe under a belt slowly turn a bent shaft clockwise.

9. Densely pressing a natyazhitel to a probe edge by means of a prutkovy key, tighten a lock nut.
10. Having turned a bent shaft, release a probe edge from under a belt, then turn a shaft further on a complete two revolutions, having in conclusion returned it to the provision of VMT of the end of a step of compression.
11. Make sure of correctness of adjustment of effort of a tension of a belt.

If it is not possible to achieve the required effort of a tension of the belt which was in the use, it is necessary to make its replacement.

12. Installation of the remained components is made as it should be the return to an order of their dismantle.