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Home >> Nissan-Datsun >> 2008 >> Sentra SL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical (Qr25DE)) >> Cylinder Head >> Disassembly and Assembly >> Disassembly

Disassembly and Assembly: Disassembly

WARNING: This page is about a different variant/trim than selected.
  1. Remove the valve lifter.
    • Confirm installation point.
  2. Remove the valve collet, valve spring retainer and valve spring using Tool.

    Tool number : KV10116200 (J-26336-B) 

    : KV10115900 (J-26336-20) 

    Fig 1: Identifying Valve Collet
    G04885790Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION: Do not remove valve spring seat from valve spring.
  3. Push valve stem to combustion chamber side, and remove valve.
    • Inspect valve guide clearance before removal. Refer to "VALVE GUIDE CLEARANCE ".
    • Confirm installation point.
  4. Remove valve oil seal using Tool.

    Tool number : KV10107902 (J-38959) 

  5. When valve seat must be replaced, refer to "VALVE SEAT REPLACEMENT ".
  6. When valve guide must be replaced, refer to "VALVE GUIDE REPLACEMENT ".
  7. Remove spark plug using suitable tool.
  8. Remove spark plug tubes, if necessary using suitable tool.
    CAUTION:
    • Be careful not to damage cylinder head.
    • Do not remove spark plug tube if not necessary. Once removed, the spark plug tube cannot be reused because of deformation.
      Fig 2: Removing Valve Oil Seal
      G04899763Courtesy of NISSAN MOTOR CO., U.S.A.
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