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B ENGINE

                                                                                                                                                               A




                                                                        ENGINE COOLING SYSTEM
                                                                                              SECTION                    CO                                    CO



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                                                                                                                                                               E
                                                               CONTENTS
PRECAUTIONS ......................................................... 2
                                                                     .          Removal and Installation (Crankshaft driven type) 18                  ...      F
 Precautions for Supplemental Restraint System                                    REMOVAL .......................................................... 18
                                                                                                                                                      .
 (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-                                          INSPECTION AFTER REMOVAL ...................... 18                  .
 SIONER" ................................................................. 2
                                                                     .            INSTALLATION .................................................. 18  .        G
 Precautions for Liquid Gasket ................................. 2   .            INSPECTION AFTER INSTALLATION ............... 19                    .
   REMOVAL OF LIQUID GASKET SEALING ......... 2                      .          Removal and Installation (Motor driven type) ........ 19              .
   LIQUID GASKET APPLICATION PROCEDURE 2                             .....        REMOVAL .......................................................... 19
                                                                                                                                                      .
                                                                                                                                                               H
PREPARATION .......................................................... 4
                                                                     .            INSTALLATION .................................................. 19  .
 Special Service Tools .............................................. 4
                                                                     .         WATER PUMP ......................................................... 20.
 Commercial Service Tools ....................................... 5  .          Removal and Installation ....................................... 20   .
OVERHEATING CAUSE ANALYSIS ......................... 6               .            REMOVAL .......................................................... 20
                                                                                                                                                      .         I
 Troubleshooting Chart ............................................. 6
                                                                     .            INSPECTION AFTER REMOVAL ...................... 22                  .
COOLING SYSTEM ................................................... 8 .            INSTALLATION .................................................. 22  .
 Cooling Circuit ......................................................... 8
                                                                     .            INSPECTION AFTER INSTALLATION ............... 23                    .        J
 System Chart .......................................................... 9
                                                                     .         WATER INLET AND THERMOSTAT ASSEMBLY ... 25
ENGINE COOLANT ................................................. 10  .          Removal and Installation ....................................... 25   .
 System Check ....................................................... 10
                                                                     .            REMOVAL .......................................................... 25
                                                                                                                                                      .
                                                                                                                                                               K
   CHECKING COOLING SYSTEM HOSES ......... 10                        .            INSPECTION AFTER REMOVAL ...................... 25                  .
   CHECKING RESERVOIR LEVEL ...................... 10                .            INSTALLATION .................................................. 26  .
   CHECKING COOLING SYSTEM FOR LEAKS ... 10                                       INSPECTION AFTER INSTALLATION ............... 26                    .
   CHECKING RESERVOIR CAP ...........................11              .         WATER OUTLET AND WATER PIPING .................. 27                    .        L
   CHECKING RADIATOR ......................................11        .          Removal and Installation ....................................... 27   .
 Changing Engine Coolant ......................................11    .            REMOVAL .......................................................... 27
                                                                                                                                                      .
   DRAINING ENGINE COOLANT .........................11               .            INSTALLATION .................................................. 27  .        M
   REFILLING ENGINE COOLANT ....................... 12               .            INSPECTION AFTER INSTALLATION ............... 27                    .
   FLUSHING COOLING SYSTEM ........................ 14               .         SERVICE DATA AND SPECIFICATIONS (SDS) ..... 29                         .
RADIATOR ............................................................... 15
                                                                     .          Standard and Limit ................................................. 29
                                                                                                                                                      .
 Removal and Installation ....................................... 15 .            ENGINE COOLANT CAPACITY (APPROXI-
   REMOVAL .......................................................... 15
                                                                     .            MATE) ................................................................. 29
                                                                                                                                                      .
   INSTALLATION .................................................. 17.            RADIATOR ......................................................... 29
                                                                                                                                                      .
   INSPECTION AFTER INSTALLATION .............. 17                   .            THERMOSTAT ................................................... 29   .
ENGINE COOLING FAN ......................................... 18      .




Revision: September 2005                                                 CO-1                                                               2006 Xterra
                                              PRECAUTIONS

PRECAUTIONS                                                         PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER"                                                                                            EBS00T57


The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
G    To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
     in the event of a collision which would result in air bag inflation, all maintenance must be per-
     formed by an authorized NISSAN/INFINITI dealer.
G    Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
     sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
     Bag Module, see the SRS section.
G    Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
     Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
     harness connectors.
Precautions for Liquid Gasket                                                                                  EBS00NLV

REMOVAL OF LIQUID GASKET SEALING
G    After removing nuts and bolts, separate the mating surface, using Tool and remove old liquid gasket seal-
     ing.
        Tool number      : KV10111100 (J-37228)
     CAUTION:
     Be careful not to damage the mating surfaces.
G    Tap Tool to insert it, and then slide it by tapping on the side as
     shown.
G    In areas where Tool is difficult to use, use plastic hammer to
     lightly tap the parts, to remove it.
     CAUTION:
     If for some unavoidable reason suitable tool such as screw-
     driver is used, be careful not to damage the mating sur-                                               WBIA0566E


     faces.
LIQUID GASKET APPLICATION PROCEDURE
1.   Remove old liquid gasket adhering to the liquid gasket applica-
     tion surface and the mating surface, Using scraper.
     G Remove liquid gasket completely from the groove of the liquid
        gasket application surface, bolts, and bolt holes.
2.   Thoroughly clean the mating surfaces and remove adhering
     moisture, grease and foreign materials.




                                                                                                            PBIC0003E



3.   Attach liquid gasket tube to Tool.




Revision: September 2005                              CO-2                                              2006 Xterra
                                               PRECAUTIONS

         Tool number      : WS39930000 (     --   )
                                                                                           A
     Use Genuine RTV Silicone Sealant or equivalent. Refer to
     GI-48, "Recommended Chemical Products and Sealants" .
4.   Apply liquid gasket without breaks to the specified location with                     CO
     the specified dimensions.
     G If there is a groove for the liquid gasket application, apply liq-
       uid gasket to the groove.
                                                                                           C

                                                                               WBIA0567E

                                                                                           D
     G As for the bolt holes, normally apply liquid gasket inside the
       holes. Occasionally, it should be applied outside the holes.
       Make sure to read the text of service manual.
                                                                                           E
     G Within five minutes of liquid gasket application, install the mat-
       ing component.
     G If liquid gasket protrudes, wipe it off immediately.
                                                                                           F
     G Do not retighten nuts or bolts after the installation.

     G After 30 minutes or more have passed from the installation, fill
       engine oil and engine coolant.                                                      G
CAUTION:                                                                       SEM159F
If there are specific instructions in this manual, observe them.
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Revision: September 2005                              CO-3                  2006 Xterra
                                                       PREPARATION

PREPARATION                                                                                                                     PFP:00002

Special Service Tools                                                                                                              EBS00NLW

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
  Tool number                                                                             Description
  (Kent-Moore No.)
  Tool name
  EG17650301                                                                             Adapting radiator cap tester to radiator cap
  (J-33984-A)                                                                            and radiator filler neck
  Radiator cap tester adapter                                                            a: 28 (1.10) dia.
                                                                                         b: 31.4 (1.236) dia.
                                                                                         c: 41.3 (1.626) dia.
                                                                                         Unit: mm (in)

                                                                         S-NT564


  KV10111100                                                                             Removing chain tensioner cover and water
  (J-37228)                                                                              pump cover
  Seal cutter




                                                                         NT046


  WS39930000                                                                             Pressing the tube of liquid gasket
  ( -- )
  Tube presser




                                                                         S-NT052


      --                                                                                 Checking concentration of ethylene glycol in
  (J-23688)                                                                              engine coolant
  Engine coolant refractometer




                                                                         WBIA0539E




Revision: September 2005                                        CO-4                                                          2006 Xterra
                           PREPARATION

Commercial Service Tools                                                           EBS00NLX

                                                                                              A
  Tool name                                   Description
  Power tool                                  Loosening nuts and bolts
                                                                                              CO



                                                                                              C
                                  PBIC0190E


  Radiator cap tester                         Checking radiator and radiator cap
                                                                                              D



                                                                                              E

                                  PBIC1982E

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Revision: September 2005      CO-5                                            2006 Xterra
                                      OVERHEATING CAUSE ANALYSIS

OVERHEATING CAUSE ANALYSIS                                                                                                      PFP:00012

Troubleshooting Chart                                                                                                               EBS00NLY


                                        Symptom                                                       Check items
                                              Water pump malfunction         Worn or loose drive belt
                                              Thermostat stuck closed                     --
                                                                             Dust contamination or
                                              Damaged fins
                Poor heat transfer                                           paper clogging                                --
                                              Heater pump                    Physical damage
                                              Clogged radiator cooling       Excess foreign material
                                              tube                           (rust, dirt, sand, etc.)
                                              Cooling fan does not oper-
                                              ate
                Reduced air flow              High resistance to fan rota-   Fan assembly                                  --
                                              tion
                                              Damaged fan blades
                Damaged radiator shroud                    --                             --                               --
                Improper engine coolant
 Cooling sys-                                              --                             --                               --
                mixture ratio
 tem parts
 malfunction    Poor engine coolant quality                --                Engine coolant viscosity                      --
                                                                                                            Loose clamp
                                                                             Cooling hose
                                                                                                            Cracked hose
                                                                             Water pump                     Poor sealing
                                                                                                            Loose
                                                                             Radiator cap
                                                                                                            Poor sealing
                                              Engine coolant leaks
                                                                                                            O-ring for damage, deterio-
                Insufficient engine coolant                                                                 ration or improper fitting
                                                                             Radiator
                                                                                                            Cracked radiator tank
                                                                                                            Cracked radiator core
                                                                             Reservoir tank                 Cracked reservoir tank
                                                                                                            Cylinder head deterioration
                                                                             Exhaust gas leaks into
                                              Overflowing reservoir tank                                    Cylinder head gasket dete-
                                                                             cooling system
                                                                                                            rioration




Revision: September 2005                                        CO-6                                                        2006 Xterra
                                      OVERHEATING CAUSE ANALYSIS

                                            Symptom                                                  Check items
                                                                                                                                        A
                                                                                                           High engine rpm under no
                                                                                                           load
                                                                                                           Driving in low gear for
                                                                           Abusive driving                                              CO
                                                                                                           extended time
                                                                                                           Driving at extremely high
                                                                                                           speed
                             --                 Overload on engine                                                                      C
                                                                           Powertrain system mal-
                                                                           function
                                                                           Installed improper size
 Except cool-                                                                                                           --
                                                                           wheels and tires                                             D
 ing system
 parts mal-                                                                Dragging brakes
 function
                                                                           Improper ignition timing
                                                                                                                                        E
                                                Blocked bumper                          --
                                                                           Installed car brassiere
                                                Blocked radiator grille    Mud contamination or                                         F
                Blocked or restricted air                                  paper clogging                               --
                flow
                                                Blocked radiator                        --
                                                Blocked condenser                                                                       G
                                                                           Blocked air flow
                                                Installed large fog lamp

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Revision: September 2005                                           CO-7                                                   2006 Xterra
                                  COOLING SYSTEM

COOLING SYSTEM                                                                     PFP:21020

Cooling Circuit                                                                         EBS00NLZ




                                                                                  WBIA0641E


  1.   Cylinder block (RH)   2.   Oil cooler           3.   Cylinder head (RH)
  4.   Water pump            5.   Radiator             6.   Water inlet
  7.   Thermostat            8.   Cylinder head (LH)   9.   Heater pump
  10. Cylinder block (LH)




Revision: September 2005                       CO-8                              2006 Xterra
                           COOLING SYSTEM

System Chart                                       EBS00NM0

                                                              A



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Revision: September 2005        CO-9        2006 Xterra
                                        ENGINE COOLANT

ENGINE COOLANT                                                                           PFP:KQ100

System Check                                                                                  EBS00NM1


WARNING:
G Never remove the radiator/reservoir cap when the engine is hot. Serious burns could occur from
  high pressure fluid escaping from the radiator.
G Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up
  pressure to escape. Carefully remove the cap by pushing down and turning it all the way.
CHECKING COOLING SYSTEM HOSES
Check hoses for the following:
G  Improper attachment
G  Leaks
G  Cracks
G  Damage
G  Loose connections
G  Chafing
G  Deterioration
CHECKING RESERVOIR LEVEL
G   Check if the reservoir tank coolant level is within MIN to MAX
    when the engine is cool.
G   Adjust coolant level if it is too much or too little.




                                                                                           SMA412B


CHECKING COOLING SYSTEM FOR LEAKS
To check for leakage, apply pressure to the cooling system using
Tool.
       Tool number      : EG17650301 (J-33984-A)

       Testing pressure    : 137 kPa (1.4 kg/cm2 , 20 psi)
WARNING:
Never remove the radiator/reservoir cap when the engine is hot.
Serious burns could occur from high pressure coolant escap-
ing from the radiator.
CAUTION:                                                                                   WBIA0568E

Higher pressure than specified may cause radiator damage.




Revision: September 2005                         CO-10                                  2006 Xterra
                                           ENGINE COOLANT

CHECKING RESERVOIR CAP
1.   Check reservoir cap relief pressure using Tool.                                                                A
         Tool number      : EG17650301 (J-33984-A)

         Standard: 78 



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