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LU


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B ENGINE

                                                                                                                                                                A


                                                                                                                                                                LU
                                                                                                    SECTION
                                                            ENGINE LUBRICATION SYSTEM                                                                           C


                                                                                                                                                                D


                                                                                                                                                                E
                                                                 CONTENTS
PRECAUTIONS ......................................................... 2.         OIL COOLER ........................................................... 10
                                                                                                                                                       .        F
 Precautions for Liquid Gasket ................................. 2     .          Removal and Installation ....................................... 10  .
   LIQUID GASKET APPLICATION PROCEDURE 2                               .....        REMOVAL .......................................................... 10
                                                                                                                                                       .
PREPARATION .......................................................... 3
                                                                       .            INSPECTION AFTER REMOVAL ...................... 11                 .        G
 Special Service Tools .............................................. 3.            INSTALLATION .................................................. 11 .
 Commercial Service Tools ....................................... 3    .            INSPECTION AFTER INSTALLATION ............... 11                   .
LUBRICATION SYSTEM ........................................... 4       .         OIL PUMP ................................................................ 12
                                                                                                                                                       .
                                                                                                                                                                H
 Lubrication Circuit ................................................... 4
                                                                       .          Removal and Installation ....................................... 12  .
 System Chart .......................................................... 5
                                                                       .            REMOVAL .......................................................... 12
                                                                                                                                                       .
ENGINE OIL .............................................................. 6
                                                                       .            INSTALLATION .................................................. 12 .
 Inspection ................................................................ 6
                                                                       .            INSPECTION AFTER INSTALLATION ............... 12                   .         I
   ENGINE OIL LEVEL ............................................ 6     .          Disassembly and Assembly ................................... 12      .
   ENGINE OIL APPEARANCE ............................... 6             .            DISASSEMBLY .................................................. 12  .
   ENGINE OIL LEAKAGE ....................................... 6        .            INSPECTION AFTER DISASSEMBLY ............... 13                    .         J
   OIL PRESSURE CHECK ..................................... 7          .            ASSEMBLY ........................................................ 14
                                                                                                                                                       .
 Changing Engine Oil ............................................... 8 .         SERVICE DATA AND SPECIFICATIONS (SDS) ..... 15                        .
OIL FILTER ................................................................ 9
                                                                       .          Standard and Limit ................................................. 15
                                                                                                                                                       .
                                                                                                                                                                K
 Removal and Installation ......................................... 9  .            OIL PRESSURE ................................................. 15  .
   REMOVAL ............................................................ 9
                                                                       .            OIL CAPACITY (APPROXIMATE) ...................... 15               .
   INSTALLATION .................................................... 9 .            OIL PUMP .......................................................... 15
                                                                                                                                                       .
   INSPECTION AFTER INSTALLATION ................ 9                    .            REGULATOR VALVE ......................................... 15       .         L



                                                                                                                                                                M




Revision: February 2006                                                     LU-1                                                             2005 Xterra
                                               PRECAUTIONS

PRECAUTIONS                                                                   PFP:00001

Precautions for Liquid Gasket                                                     EBS00NLJ

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.
         Tool number      : WS39930000 (     --   )
     Use Genuine RTV Silicone Sealant or equivalent. Refer to
     GI-46, "Recommended Chemical Products and Sealants" .
4.   Apply liquid gasket without breaks to the specified location with
     the specified dimensions.
     G If there is a groove for the liquid gasket application, apply liq-
       uid gasket to the groove.


                                                                               WBIA0567E



     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.
     G Within five minutes of liquid gasket application, install the mat-
       ing component.
     G If liquid gasket protrudes, wipe it off immediately.

     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.
CAUTION:                                                                       SEM159F
If there are specific instructions in this manual, observe them.




Revision: February 2006                                LU-2                 2005 Xterra
                                                       PREPARATION

PREPARATION                                                                                                                   PFP:00002
                                                                                                                                             A
Special Service Tools                                                                                                             EBS00NLK

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
  Tool number                                                                            Description
                                                                                                                                             LU
  (Kent-Moore No.)
  Tool name
  ST25051001                                                                             Measuring oil pressure
  (J-25695-1)                                                                            Maximum measuring range: 2,452 kPa (25              C
  Oil pressure gauge                                                                     kg/cm2 , 356 psi)


                                                                                                                                             D

                                                                         NT050


  ST25052000                                                                             Adapting oil pressure gauge to oil pan (upper)      E
  (J-25695-2)
  Hose

                                                                                                                                             F


                                                                         S-NT559
                                                                                                                                             G
  KV10115801                                                                             Removing oil filter
  (J-38956)                                                                              a: 64.3 mm (2.531 in)
  Oil filter wrench
                                                                                                                                             H



                                                                         S-NT375
                                                                                                                                              I
  WS39930000                                                                             Pressing the tube of liquid gasket
  ( -- )
  Tube presser                                                                                                                                J



                                                                                                                                             K
                                                                         NT052




Commercial Service Tools                                                                                                          EBS00NLL
                                                                                                                                              L
  Tool name                                                                              Description
  Power tool                                                                             Loosening nuts and bolts
                                                                                                                                             M




                                                                         PBIC0190E


  Deep socket                                                                            Removing and installing oil pressure sensor
                                                                                         a: 24 mm (0.94 in)




                                                                         PBIC2072E




Revision: February 2006                                         LU-3                                                      2005 Xterra
                          LUBRICATION SYSTEM

LUBRICATION SYSTEM                               PFP:15010

Lubrication Circuit                                   EBS00NLM




                                                PBIC2821E




Revision: February 2006          LU-4          2005 Xterra
                          LUBRICATION SYSTEM

System Chart                                          EBS00NLN

                                                                 A


                                                                 LU



                                                                 C


                                                                 D


                                                                 E



                                                                 F


                                                                 G


                                                                 H



                                                PBIC2822E         I


                                                                  J



                                                                 K


                                                                  L



                                                                 M




Revision: February 2006          LU-5          2005 Xterra
                                               ENGINE OIL

ENGINE OIL                                                                                             PFP:KLA92

Inspection                                                                                                  EBS00NLO

ENGINE OIL LEVEL
Before starting the engine make sure the vehicle is parked on a flat and level surface, then check the oil level.
If the engine is already running, turn it off and allow 10 minutes before checking.
1. Pull out oil level gauge and wipe it clean.
2. Insert oil level gauge and make sure the engine oil level is within
     the range as indicated on gauge.
3. If the engine oil is out of range, add oil as necessary.




                                                                                                         PBIC2823E


ENGINE OIL APPEARANCE
G   Check engine oil for white milky or excessive contamination.
G   If engine oil becomes milky, it is highly probable that it is contaminated with engine coolant. Repair or
    replace damaged parts.
ENGINE OIL LEAKAGE
Check for oil leakage around the following areas:
G  Oil pans (lower and upper)
G  Oil pan drain plug
G  Oil pressure sensor
G  Oil filter
G  Oil cooler
G  Water pump cover
G  Chain tensioner cover
G  Intake valve timing control cover and intake valve timing control solenoid valve
G  Mating surface between cylinder block and cylinder head
G  Mating surface between lower cylinder block and cylinder block
G  Mating surface between cylinder head and rocker cover
G  Mating surface between front timing chain case and rear timing chain case
G  Mating surface between rear timing chain case and cylinder head
G  Mating surface between rear timing chain case and cylinder block
G  Mating surface between rear timing chain case and lower cylinder block
G  Mating surface between rear timing chain case and oil pan (upper)
G  Crankshaft oil seals (front and rear)
G  Oil level gauge guide
G  Camshaft position sensor (PHASE)




Revision: February 2006                              LU-6                                            2005 Xterra
                                              ENGINE OIL

OIL PRESSURE CHECK
WARNING:                                                                                                             A
G  Be careful not to burn yourself, as engine oil may be hot.
G  Oil pressure check should be done in "Parking position" (A/T models).
1. Check engine oil level. Refer to LU-6, "ENGINE OIL LEVEL" .                                                       LU
2. Remove undercover with power tool.
3. Disconnect oil pressure sensor harness connector.
                                                                                                                     C
4. Disconnect harness connector at oil pressure sensor, and
   remove oil pressure sensor.
   CAUTION:
                                                                                                                     D
   Do not drop or shock oil pressure sensor.


                                                                                                                     E



                                                                                                                     F
                                                                                                         LBIA0424E



5.   Install Tools.
                                                                                                                     G
        Tool numbers : ST25051001 (J-25695-1)
                     : ST25052000 (J-25695-2)
                                                                                                                     H



                                                                                                                      I


                                                                                                         WBIA0571E
                                                                                                                      J
6.   Start engine and warm it up to normal operating temperature.
7.   Check oil pressure with engine running under no-load.
     NOTE:                                                                                                           K
     When engine oil temperature is low, engine oil pressure becomes high.
     Engine oil pressure [Engine oil temperature at 80



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