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Home >> Nissan-Datsun >> 2011 >> Sentra S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical (Qr25DE)) >> Service Information >> Timing Chain >> Removal and Installation >> Removal

Removal and Installation: Removal

WARNING: This page is about a different variant/trim than selected.
  1. Remove the engine from the vehicle. Refer to "REMOVAL AND INSTALLATION ".
  2. Mount engine to suitable stand.
  3. Remove the drive belt auto-tensioner. Refer to "REMOVAL AND INSTALLATION OF DRIVE BELT AUTO-TENSIONER ".
  4. Remove the A/C compressor. Refer to "REMOVAL AND INSTALLATION FOR COMPRESSOR - QR25DE ".
  5. Remove the upper and lower oil pan, and oil strainer. Refer to "REMOVAL AND INSTALLATION ".
  6. Disconnect variable timing control solenoid harness connector.
  7. Remove engine ground.
  8. Loosen IVT control cover bolts in the numerical order as shown in the figure below.
    Fig 1: IVT Control Cover Bolt Loosening Sequence
    G07137495Courtesy of NISSAN MOTOR CO., U.S.A.

    Remove the IVT control cover using Tool.

    Tool number : KV10111100 (J-37228) 

    Fig 2: Removing Ivt Control Cover Using Tool
    G07137496Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Pull chain guide between camshaft sprockets out through front cover.
  10. Set the No. 1 cylinder at TDC on the compression stroke with the following procedure:
    1. Rotate the crankshaft pulley clockwise and align the mating marks to the timing indicator on the front cover.
      Fig 3: Setting No. 1 Cylinder At TDC On Compression Stroke
      G07137497Courtesy of NISSAN MOTOR CO., U.S.A.
    2. At the same time, make sure that the mating marks on the camshaft sprockets are lined up as shown in the figure.
      • If not lined up, rotate the crankshaft pulley one more turn to line up the mating marks to the positions as shown in the figure.
        Fig 4: Location Of Mating Marks On Camshaft Sprockets
        G07137498Courtesy of NISSAN MOTOR CO., U.S.A.
  11. Remove crankshaft pulley with the following procedure:
    1. Hold the crankshaft pulley using suitable tool, then loosen the crankshaft pulley bolt, and pull the pulley out about 10 mm (0.39 in).
      Fig 5: Removing Crankshaft Pulley
      G07137499Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Attach suitable pulley puller in the M 6 (0.24 in diameter) thread hole on crankshaft pulley, and remove crankshaft pulley using a suitable puller.
      Fig 6: Attaching Suitable Pulley Puller In M 6 (0.24 In Diameter) Thread Hole On Crankshaft Pulley
      G07137500Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove the front cover with the following procedure:
    1. Loosen the bolts in the reverse order as shown in the figure, and remove them.
      2. Fig 7: Front Timing Cover Bolt (Reverse For Loosening)
      G07137501Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Remove the front cover.
      CAUTION:
      • Be careful not to damage the mounting surface.
  13. If the front oil seal needs to be replaced, lift it out with a screwdriver to remove it.
  14. Remove timing chain with the following procedure:
    1. Push in the tensioner plunger. Insert a stopper pin into the hole on the tensioner body to hold the chain tensioner.
      • Use a wire of 0.5 mm (0.02 in) diameter as a stopper pin.
    2. Remove the chain tensioner.
      Fig 8: Removing Chain Tensioner
      G07137502Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Secure hexagonal part of the camshaft with a wrench and loosen the camshaft sprocket bolt and remove the camshaft sprocket for both camshafts.
      CAUTION:
      • Do not rotate the crankshaft or camshafts while the timing chain is removed. It can cause damage to the valve and piston.
        Fig 9: Removing Camshaft Sprocket For Both Camshafts
        G07137503Courtesy of NISSAN MOTOR CO., U.S.A.
  15. Remove the chain slack guide, tension guide, timing chain, and oil pump drive spacer.
  16. Press stopper tab (A) in the direction shown in the figure to push the timing chain slack guide (B) toward timing chain tensioner (for balancer unit) (1).
    • The slack guide (B) is released by pressing the stopper tab (A). As a result, the slack guide (B) can be moved.
  17. Insert stopper pin (D) into tensioner body hole (C) to secure timing chain slack guide (B).
    NOTE: Use a hard metal pin with a diameter of approximately 1.2 mm (0.047 in) as a stopper pin.
  18. Remove timing chain for balancer unit, sprocket for balancer unit and crankshaft sprocket.
    Fig 10: Removing Timing Chain For Balancer Unit, Sprocket For Balancer Unit And Crankshaft Sprocket
    G07137504Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Loosen bolts in reverse order as shown in the figure, and remove balancer unit, if necessary.
    • Use Torx socket (size E14)
      CAUTION:
      • Do not disassemble balancer unit.
        Fig 11: Removing Balancer Unit
        G07137505Courtesy of NISSAN MOTOR CO., U.S.A.
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