Nissan Maxima QX

since 1993 of release

Repair and car operation



Nissan Maxima QX
+ Nissan Maxima brand Cars
+ Maintenance instruction
+ Settings and routine maintenance
- Engine
   - SOHC engines
      General information
      Preparatory actions and the list of repair procedures which can be executed without engine extraction from the car
      Reduction of the piston of the first cylinder in the provision of the top dead point (VMT)
      Removal and installation of covers of heads of cylinders
      Removal, check of a condition and installation of assembly of yokes
      Replacement of maslootrazhatelny caps and klapanny springs with plates
      Removal and installation of a gas-distributing belt and cogwheels of a drive of GRM
      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 cranked shaft
      Replacement of a forward epiploon of a cranked shaft
      Removal and installation of the pallet of a case of the engine
      Removal, check of a condition and installation of the oil pump
      Removal and flywheel installation / driving disk
      Replacement of a back epiploon of a cranked shaft
      Check of a condition and replacement of support of a suspension bracket of the power unit
   + DOHC Engines
   + General major maintenance of the engine
+ Systems of cooling, 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
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Reduction of the piston of the first cylinder in the provision of the top dead point (VMT)

The description of procedure provided below is made on the basis of the assumption of correctness of connection of VV of candle wires and installation of the distributor of ignition. If there is a need of reduction of the engine for VMT for the purpose of correction of position of the distributor, position of the piston in the first cylinder of the engine can be qualitatively defined by a way of tracking of change of kompressionny pressure through a candle opening. Further it is necessary to achieve combination of the corresponding adjusting labels.


 PERFORMANCE ORDER

1. The highest point of a piston stroke in the cylinder is called as the top dead point (VMT). Strictly speaking, in 4-тактных engines in the course of rotation of a cranked shaft this situation is reached by each of pistons twice: once at the end of a step of compression and the second - at the end of a final step. At performance of settings of phases of a gazoraspredeleniye and installation of a corner of an advancing of ignition in overwhelming majority of cases the provision VMT of the end of a step of compression of the piston (usually the first cylinder) is used.
2. Need for piston reduction (it) in situation VMT arises at carrying out many procedures, in particular such, as removal/installation of camshafts, components of a drive of GRM and the ignition distributor.
3. Make sure that transmission is transferred to neutral situation, then strongly cock the parking brake, or prop up back wheels of the car protivootkatny boots. Also immobilize ignition system, having disconnected a coil wire from a cover of the distributor and having earthed it on mass of the block. Remove spark plugs (see. Head of Control and routine maintenance).
4. Reduction of any of pistons in situation VMT is made by a provorachivaniye of a cranked shaft of the engine by one of described below ways. If to take a detached view of the engine in front of (a driving belt), the direction clockwise will be the normal direction of rotation of a cranked shaft. Remember that attempt of a provorachivaniye of a shaft counter-clockwise can lead to violation of adjustments of a gas-distributing belt:

a) The most effective method is the shaft provorachivaniye in the normal direction for a bolt screwed in an end face of its forward pin by means of a face natural by a ratchet drive;
b) To save time use of the remote switch of a starter (follow instructions of manufacturers) will allow. As soon as the piston will appear rather close from VMT of the end of a step of compression, the starter stops and further adjustment is carried out by a method described in point (and);
c) In the presence of the assistant, the preliminary provorachivaniye of the engine can be carried out by short breakthroughs from a driver's place under the direction of the operator. The same principle, as described in point (b). Final adjustment, besides, is made manually, by means of a face key (see point and).

5. Remember position of the plug of connection of a candle wire of the first cylinder on a distributor cover. If the plug is not marked, walk on a wire from a candle to a cover and put the corresponding label independently.

6. By means of a marker or chalk mark a rim of the case of the distributor in a point directly under the plug of the first cylinder of a cover.
7. Uncover the distributor and put it aside (see. Head of Control and routine maintenance).

8. Turn a cranked shaft clockwise so that the zero (yellow) label of VMT on its pulley was combined with the triangular index on a cover of a gas-distributing belt.

On a pulley there are some adjusting labels: from 0 (VMT) to 30 ° with a step in 5 °. The extreme left mark (looking in front) which is usually tinted in yellow color is zero.

9. Now check situation a distributor begunka, - it should appear the developed nouse precisely to a label on a case rim.

10. If a begunok will develop concerning a label on 180 °, therefore, the piston of the first cylinder is in the provision VMT of the end of a final step.
11. To bring the piston into VMT of the end of a step of compression, it is necessary to turn a cranked shaft on one complete revolution (360 °) clockwise. Now the begunok should be developed by a nouse to a label.
12. If all listed above a condition about combination of labels are observed, it is possible to consider a task executed, - the piston of the first cylinder is given in the provision VMT of the end of a step of compression.
13. Now, that serially, as ignition to bring into VMT the remained pistons, it is necessary to put the corresponding labels on a rim of the case of the distributor (as it did higher for the plug of connection of the first candle wire). Provorachivaniye of a cranked shaft will be inevitably accompanied by rotation a begunka, which combination of a nouse with the corresponding label and is confirmation of reduction of the next piston in VMT of the end of a step of compression.

For transition from VMT of one cylinder to following VMT the cranked shaft should be turned on 120 °.