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Home >> Nissan-Datsun >> 2011 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical (Qr25DE) >> Service Information >> Camshaft >> Removal and Installation >> Removal

Removal and Installation: Removal

  1. Disconnect battery negative terminal. Refer to "REMOVAL AND INSTALLATION (QR25DE BATTERY) ".
  2. Remove the rocker cover. Refer to "REMOVAL AND INSTALLATION ".
  3. Remove the splash shield (RH). Refer to "COMPONENT ".
  4. Support the front of the engine using a suitable jack.
  5. Remove the torque rod and the engine mounting insulator and bracket (RH). Refer to "REMOVAL AND INSTALLATION ".
  6. Remove the coolant overflow reservoir tank.
  7. Disconnect variable timing control solenoid harness connector.
  8. Loosen the IVT control cover bolts in the order as shown in the figure below.
    Fig 1: IVT Control Cover Bolt Loosening Sequence
    G07137459Courtesy of NISSAN MOTOR CO., U.S.A.
    • Remove the IVT control cover by cutting the sealant using Tool.

      Tool number : KV10111100 (J-37228) 

      Fig 2: Removing IVT Control Cover
      G07137460Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Set the No. 1 cylinder at TDC on its compression stroke with the following procedure:
    1. Rotate crankshaft pulley clockwise, and align mating marks for TDC with timing indicator on front cover, as shown in the figure.
      Fig 3: Aligning Mating Marks For TDC With Timing Indicator On Front Cover
      G07137461Courtesy of NISSAN MOTOR CO., U.S.A.
    2. At the same time, make sure that the mating marks on camshaft sprockets are lined up with the yellow links in the timing chain, as shown in the figure.
      • If not, rotate crankshaft pulley one more turn to line up the mating marks to the yellow links, as shown in the figure.
        Fig 4: Identifying Mating Marks On Camshaft Sprockets
        G07137462Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Disconnect and remove the camshaft position sensor.
  11. Pull the timing chain guide out between the camshaft sprockets through front cover.
  12. Remove camshaft sprockets with the following procedure.
    CAUTION:
    • Do not rotate the crankshaft or camshaft while the timing chain is removed. It causes interference between valve and piston.
    NOTE:
    • Chain tension holding work is not necessary. Crankshaft sprocket and timing chain do not disconnect structurally while front cover is attached.
      Fig 5: Rotating Camshaft Sprocket & Timing Chain
      G07137463Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Line up the mating marks on camshaft sprockets with the yellow links in the timing chain, and paint an indelible mating mark on the sprocket and timing chain link plate.
    2. Push in the tensioner plunger and hold. Insert a stopper pin into the hole on tensioner body to hold the chain tensioner. Remove the timing chain tensioner.
      • Use a wire with 0.5 mm (0.02 in) diameter for a stopper pin.
    3. Secure the hexagonal part of camshaft with a suitable tool. Loosen the camshaft sprocket mounting bolts and remove the camshaft sprockets.
      Fig 6: Securing Hexagonal Part Of Camshaft With Suitable Tool
      G07137464Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Loosen the camshaft bracket bolts in the order as shown in the figure, and remove the camshaft brackets and camshafts.
    • Remove No. 1 camshaft bracket by slightly tapping it with a rubber mallet.
  14. Remove the valve lifters, if necessary.
    • Check mounting positions, and set them aside in the order removed.
      Fig 7: Camshaft Bracket Bolt Loosening Sequence
      G07137465Courtesy of NISSAN MOTOR CO., U.S.A.
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