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
- Systems of cooling, heating
   General information
   Antifreeze - general information
   Check of serviceability of functioning and thermostat replacement
   Check of a condition of fans of system of cooling and chains of their inclusion, replacement of components
   Removal and installation of a radiator and expanded tank of system of cooling
   Check of a condition and replacement of the water pump
   Check of serviceability of functioning and replacement of the block of the sensor of a measuring instrument of temperature of cooling liquid
   Check of serviceability of functioning of the driving electromotor of the fan of a heater and condition of components of its electric chain, …
   Removal and installation of the electromotor of a drive of the fan of a heater
   Removal and installation of assembly of the control panel by functioning of a heater and air conditioner, adjustment of a driving cable
   Removal and installation of the heat exchanger of a heater
   Check of serviceability of functioning and service of systems of heating and air conditioning
   Removal and receiver dehumidifier installation To/in
   Removal, service and To/in compressor installation
   Removal and To/in condenser installation
+ 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 of a condition and replacement of the water pump



1. Failure of the water pump is capable to cause the most serious consequences, up to complete jamming of the engine as a result of an overheat.
2. There are two ways of check of serviceability of functioning of the water pump without its removal from the engine. The defective pump is subject to replacement. The first - the simplest: at the working, heated-up engine to normal working temperature compress the top hose of a radiator. At regularly functioning water pump in a hose liquid pulsations should differ distinctly.

Try not to touch to blades a krylchatok of fans of system of cooling!

3. The water pump is equipped with a control/ventilating opening. In case of epiploon failure from an opening cooling liquid starts to exude. On SOHC engines uncover GRM drive. Prepare a pocket small lamp and a small pocket mirror, - the opening is located from below on the pump case. Existence round an opening of deposits of brownish color testifies to malfunction of an epiploon, - easy decolouration of a surface (a ring of light gray color) should not cause concern. On DOHC engines the control opening removes cooling liquid outside between a cover of a drive of GRM the engine block.

4. At failure of bearings of a shaft of the pump in engine operating time in its forward part there can be a howling sound which should not be confused to the whistle published by a driving belt at weakening of effort of its tension. On SOHC engines wear of the bearing can be revealed on existence люфта when rocking a pulley of the pump (do not forget to switch off before the engine and to throw off from a pulley a belt). On DOHC engines it is necessary to weaken the main gas-distributing chain and to remove a special cover of access to the pump, - the opening of access is provided in a forward cover of a drive of GRM. Wear of the bearing is determined by existence люфта in bulk when rocking a driving asterisk of the pump
5. Even in the absence of external signs of wear the final conclusion about a condition of the water pump can be made only after its removal and more detailed studying, - often blades from a reverse side of a rotor strongly collapse as a result of corrosion that brings to essential to pump decline of productivity.


Start procedure performance only after complete cooling of the engine! See also preventions at the beginning of the Section Antifreeze - general information.


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 have the correct combination for audiosystem input in action!

2. Empty cooling system (see. Head of Control and routine maintenance). If replacement of cooling liquid was made recently, keep for further use (see the prevention in the Section Antifreeze - general information).
3. Remove driving belts (see. Head of Control and routine maintenance).

4. On SOHC engines block a pulley of the water pump from a provorachivaniye by means of a tape key and give four fixing bolts. Remove a pulley and covers of a gas-distributing belt.

5. On DOHC engines remove an arm of an intermediate roller of a driving belt and assembly of the right support of a suspension bracket of the power unit with the arms. Also uncover a natyazhitel of the main gas-distributing chain a forward cover of a drive of GRM. Wring out inside the piston of a natyazhitel of a chain and pass a pin of suitable diameter in a blocking opening of a natyazhitel. Turn a cranked shaft on 20 ° counter-clockwise for the purpose of weakening of a chain on asterisks of the water pump.
6. Turn out fixing bolts and remove the pump from the engine. Check blades of a krylchatka from a reverse side of a rotor on existence of signs of corrosion and destruction.

7. Clean a carving of fixing bolts and boltovy openings, having completely removed traces of corrosion and old hermetic and having restored the damaged rounds.
8. Make sure of identity of tiporazmerny characteristics of new and old pumps.
9. Scratch out the remains of old hermetic from an interfaced surface of the block of the engine.
10. Carefully wipe interfaced surfaces of the new pump the rags moistened in acetone.
11. On SOHC engines put on an interfaced surface of the new pump a thin layer of RTV hermetic, then accurately press new sealing laying. On DOHC engines establish on the pump a new sealing ring, then slightly grease it with dense greasing for the purpose of simplification of landing of assembly in the engine block.
12. Accurately plant the pump on the regular place, screw fixing bolts and tighten them by hand.

Before a vvorachivaniye of bolts grease their carving part with RTV hermetic. Track, that all provided directing pins were on the places.

13. In stages (on 1/4 turns for an approach) tighten fixture with demanded effort. Remember that excessively strong obtyagivaniye of bolts can lead to pump damage. On DOHC engines turn a cranked shaft on 20 ° clockwise for the purpose of an obtyagivaniye of the main chain on a pump asterisk, take a lock pin from a natyazhitel and establish to the place of a cover of access to a natyazhitel and to the pump.

Covers should be put on RTV hermetic.

14. Establish all other components acting in film for the purpose of ensuring access.
15. Fill system of cooling and remove from it air jams (see. Head of Control and routine maintenance). Start the engine and check it on existence of signs of leakages of cooling liquid.

On DOHC engines at first, before complete removal of air from the chamber of a high pressure, the increased noise level, published by a gas-distributing chain can take place. For elimination of noise let's to the engine some time work with frequency of 3000 rpm.