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Home › Infiniti › 2006 › QX56 AWD › Repair and Diagnosis › Transmission › Transfer Case › Transfer Assembly › Disassembly and Assembly › Assembly › Center Case

Center Case

  1. Apply ATF to the new O-ring, and install it on the oil filter stud.
    CAUTION: Do not reuse O-ring.
  2. Install the oil filter stud to the oil filter.
    Fig 1: Identifying Oil Filter Stud To Oil Filter
    G04134191Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Apply ATF to the two new O-rings (1), and install them on the oil filter (2).
    CAUTION: Do not reuse O-rings.
    Fig 2: Identifying O-Rings
    G04134192Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Install the oil filter to the center case. Tighten the bolts to the specified torque. Refer to "COMPONENTS ".
    CAUTION:
    • Do not damage oil filter.
    • Attach oil filter and tighten bolts evenly.
      Fig 3: Identifying Oil Filter To Center Case
      G04134193Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Install the outer gear and inner gear into the sub oil pump housing, and measure the side clearance. Refer to "SUB-OIL PUMP ".
    Fig 4: Identifying Outer Gear And Inner Gear Into Sub Oil Pump Housing
    G04134194Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Align the dowel pin hole and bolt hole of the sub oil pump assembly with the center case. Install the sub oil pump cover. Then tighten to the specified torque. Refer to "COMPONENTS ".
    Fig 5: Identifying Sub Oil Pump Cover
    G04134195Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Apply ATF to the new O-ring and install it to the transfer motor.
    CAUTION: Do not reuse O-ring.
  8. Fit the double-flat end of the transfer motor shaft into the slot of the sub-oil pump assembly. Then tighten to the specified torque. Refer to "COMPONENTS ".
    CAUTION: Be sure to install connector bracket.
    Fig 6: Identifying O-Ring And Transfer Motor
    G04134196Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Assemble the control valve assembly with the following procedure.
    CAUTION:
    • Do not reuse any part that has been dropped or damaged.
    • Make sure valve is assembled in the proper direction.
    • Do not use a magnet because residual magnetism stays during assembly.
    1. Clean the upper body, control valves and springs with cleaning agent, and dry with compressed air.
    2. Dip the control valves in ATF, and apply ATF to the valve-mounting area of the upper body.
      Fig 7: Applying ATF To Valve-Mounting Area Of Upper Body
      G04134197Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Install each control valve, spring, and plug to the upper body, and install retainer plates to hold them in place.
      CAUTION:
      • To insert control valves into upper body, place upper body on a level surface in order to prevent flaw or damage.
      • Make sure each control valve is smoothly inserted.
        Fig 8: Identifying Control Valve, Spring, And Plug To Upper Body
        G04134198Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Install the reverse balls, relief balls and relief springs, accumulator pistons and valve springs to the upper body.
      Fig 9: Identifying Reverse Balls, Relief Balls And Relief Springs, Accumulator Pistons And Valve Springs To Upper Body
      G04134199Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Install the lower body and new separator plate to the upper body.
      CAUTION: Do not reuse separator plate.
      Fig 10: Identifying Lower Body And New Separator Plate To Upper Body
      G04134200Courtesy of NISSAN MOTOR CO., U.S.A.
    6. With the lower body down, tighten the two bolts shown.
    7. Apply ATF to the new O-rings, and install them to each solenoid valve, switch and terminal body.
      CAUTION: Do not reuse O-rings.
    8. Install the following to the control valve assembly:
      • Clutch pressure solenoid valve
      • 2-4WD shift solenoid valve
      • Clutch pressure switch
      • Line pressure switch
      • Transfer fluid temperature sensor
        Fig 11: Tightening Bolts
        G04134201Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Apply ATF to the new lip seals, and install them to the center case.
    CAUTION:
    • Do not reuse lip seals.
    • There are 2 kinds of lip seals (lip seal of large inner diameter: 5 pieces, lip seal of small inner diameter: 2 pieces). Confirm their position for installation.
      Fig 12: Identifying Lip Seals
      G04134202Courtesy of NISSAN MOTOR CO., U.S.A.
  11. Install the control valve assembly to the center case, and tighten to the specified torque. Refer to "COMPONENTS ".
    CAUTION:
    • Do not reuse any part that has been dropped or damaged.
    • Make sure valve is assembled in the proper direction.
    • Do not use a magnet because residual magnetism stays during assembly.
      Fig 13: Identifying Control Valve Assembly To Center Case
      G04134203Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Install the connector assembly into the center case, and secure with a snap ring.
    Fig 14: Identifying Connector Assembly Into Center Case
    G04134204Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Apply ATF to the new O-rings, and install them on the oil strainer.
    CAUTION: Do not reuse O-rings.
  14. Install the oil strainer to the control valve assembly.
    Fig 15: Identifying Oil Strainer
    G04134205Courtesy of NISSAN MOTOR CO., U.S.A.
  15. Tighten the bolts to the specified torque. Refer to "COMPONENTS ".
    Fig 16: Identifying Bolts
    G04134206Courtesy of NISSAN MOTOR CO., U.S.A.
  16. Apply ATF to the new D-rings, and install them to the clutch piston.
    CAUTION: Do not reuse D-rings.
    Fig 17: Identifying D-Rings
    G04134207Courtesy of NISSAN MOTOR CO., U.S.A.
  17. Install the thrust needle bearing race to the clutch piston.
    Fig 18: Installing Thrust Needle Bearing Race To Clutch Piston
    G04134208Courtesy of NISSAN MOTOR CO., U.S.A.
  18. Install the clutch piston to the center case as shown.
    CAUTION: Install so the fitting protrusion of clutch piston aligns with the dent of center case.
    Fig 19: Identifying Clutch Piston To Center Case
    G04134209Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Remove all the sealant from the oil pressure check port and inside the center case.
    CAUTION: Remove old sealant adhering to mating surfaces. Also remove any moisture, oil, or foreign material adhering to application and mating surfaces.
  20. Thread the new oil pressure check plug in 1 or 2 pitches and apply sealant to the oil pressure check plug threads. Tighten to the specified torque. Refer to "COMPONENTS ".
    CAUTION: Do not reuse oil pressure check plug.
    Fig 20: Identifying Sealant From Oil Pressure Check Port
    G04134210Courtesy of NISSAN MOTOR CO., U.S.A.
  21. Install the new snap ring to the clutch hub using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 21: Identifying Snap Ring To Clutch Hub Using Suitable Tool
    G04134211Courtesy of NISSAN MOTOR CO., U.S.A.
  22. Apply petroleum jelly to the needle bearing, and install the needle bearing, spacer, clutch drum and clutch hub to the mainshaft.
    Fig 22: Identifying Needle Bearing, Spacer, Clutch Drum And Clutch Hub To Mainshaft
    G04134212Courtesy of NISSAN MOTOR CO., U.S.A.
  23. Install the new snap ring to the mainshaft.
    CAUTION: Do not reuse snap ring.
    Fig 23: Identifying Snap Ring To Mainshaft
    G04134213Courtesy of NISSAN MOTOR CO., U.S.A.
  24. Apply ATF to each plate, then install them into the clutch drum as shown.
    Fig 24: Identifying Plate
    G04134214Courtesy of NISSAN MOTOR CO., U.S.A.
  25. Install the return spring assembly into the clutch hub.
    Fig 25: Installing Return Spring Assembly Into Clutch Hub
    G04134215Courtesy of NISSAN MOTOR CO., U.S.A.
  26. Install the press flange by aligning the notches to the clutch hub as shown.
    Fig 26: Identifying Press Flange
    G04134216Courtesy of NISSAN MOTOR CO., U.S.A.
  27. Press the press flange to install the new snap ring into snap ring groove on mainshaft using Tools.

    Tool number A: ST22452000 (J-34335) 

    B: ST30911000 ( - ) 

    C: KV31103300 ( - ) 

    CAUTION: Do not reuse snap ring.
    Fig 27: Pressing Press Flange
    G04134217Courtesy of NISSAN MOTOR CO., U.S.A.
  28. Install the new snap ring to the mainshaft using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 28: Identifying Snap Ring To Mainshaft Using Suitable Tool
    G04134218Courtesy of NISSAN MOTOR CO., U.S.A.
  29. Apply ATF to the thrust needle bearing and install it on the press flange.
    Fig 29: Installing Thrust Needle Bearing
    G04134219Courtesy of NISSAN MOTOR CO., U.S.A.
  30. Install the new snap ring to the main shaft.
    CAUTION: Do not reuse snap ring.
    Fig 30: Identifying Snap Ring To Main Shaft
    G04134220Courtesy of NISSAN MOTOR CO., U.S.A.
  31. Install the mainshaft rear bearing to the center case using Tool.

    Tool number : ST15310000 (J-25640-B) 

    Fig 31: Identifying Mainshaft Rear Bearing To Center Case Using Tool
    G04134221Courtesy of NISSAN MOTOR CO., U.S.A.
  32. Press the mainshaft assembly into the center case using Tools.

    Tool number A: ST30911000 ( - ) 

    B: ST33052000 ( - ) 

    Fig 32: Pressing Mainshaft Assembly Into Center Case Using Tools
    G04134222Courtesy of NISSAN MOTOR CO., U.S.A.
  33. Install the C-rings to the mainshaft.
    Fig 33: Identifying C-Rings To Mainshaft
    G04134223Courtesy of NISSAN MOTOR CO., U.S.A.
  34. Set the washer holder on the mainshaft, and secure it with a new snap ring using suitable tool.
    CAUTION: Do not reuse snap ring.
    Fig 34: Setting Washer Holder On Mainshaft
    G04134224Courtesy of NISSAN MOTOR CO., U.S.A.
  35. Apply petroleum jelly to the stem bleeder and install it to the center case.
    Fig 35: Applying Petroleum Jelly To Stem Bleeder
    G04134225Courtesy of NISSAN MOTOR CO., U.S.A.
  36. Apply ATF to the new seal ring and install it to the main oil pump cover.
    CAUTION: Do not reuse seal ring.
    Fig 36: Installing Seal Ring
    G04134226Courtesy of NISSAN MOTOR CO., U.S.A.
  37. Install the inner gear and outer gear in the main oil pump housing. Then measure the side clearance. Refer to "MAIN OIL PUMP ".
    Fig 37: Installing Inner Gear And Outer Gear In Main Oil Pump Housing
    G04134227Courtesy of NISSAN MOTOR CO., U.S.A.
  38. Install the main oil pump housing, outer gear and inner gear to the center case.
    Fig 38: Installing Main Oil Pump Housing, Outer Gear And Inner Gear To Center Case
    G04134228Courtesy of NISSAN MOTOR CO., U.S.A.
  39. Install the main oil pump cover to the center case, and tighten to the specified torque. Refer to "COMPONENTS ".
    Fig 39: Identifying Main Oil Pump Cover To Center Case
    G04134229Courtesy of NISSAN MOTOR CO., U.S.A.
  40. Remove all the sealant from the switch mating area and inside the center case.
    CAUTION: Remove old sealant adhering to mating surfaces. Also remove any moisture, oil, or foreign material adhering to application and mating surfaces.
  41. Thread the ATP switch and neutral-4LO switch in one to two pitches and apply sealant to the threads of the switches. Tighten to the specified torque. Refer to "COMPONENTS ".
    • Use Genuine Silicone RTV or equivalent. Refer to " RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS  ". 
      NOTE:
      • Neutral-4LO switch harness connector is gray.
      • ATP switch harness connector is black.
        Fig 40: Identifying Sealant Applying Area Of ATP Switch And Neutral - 4LO Switch Threads
        G04134230Courtesy of NISSAN MOTOR CO., U.S.A.
  42. Install the front drive shaft rear bearing using Tools.

    Tool number A: KV40100621 (J-25273) 

    B: ST30032000 (J-26010-01) 

    Fig 41: Identifying Front Drive Shaft Rear Bearing Using Tools
    G04134231Courtesy of NISSAN MOTOR CO., U.S.A.
  43. Install the front drive shaft to the front bearing using Tools.

    Tool number A: KV40100621 (J-25273) 

    B: ST30032000 (J-26010-01) 

    Fig 42: Identifying Front Drive Shaft To Front Bearing Using Tools
    G04134232Courtesy of NISSAN MOTOR CO., U.S.A.
  44. Install the drive chain to the front drive shaft and clutch drum.
    CAUTION: Install drive chain by aligning identification marks to the rear as shown.
    Fig 43: Identifying Drive Chain To Front Drive Shaft And Clutch Drum
    G04134233Courtesy of NISSAN MOTOR CO., U.S.A.
  45. Tap the front drive shaft while keeping it upright and press-fit the front drive shaft rear bearing.
    CAUTION: Do not tap drive chain.
  46. Install the front case assembly. Refer to "FRONT CASE ".
  47. Install the rear case assembly. Refer to "REAR CASE ".
    Fig 44: Taping Front Drive Shaft
    G04134234Courtesy of NISSAN MOTOR CO., U.S.A.
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