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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical (Pr25DD) (2 Of 2)) >> Removal And Installation >> Cylinder Head >> CYLINDER HEAD : Disassembly & Assembly >> Disassembly

CYLINDER HEAD : Disassembly & Assembly: Disassembly

WARNING: This page is about a different variant/trim than selected.
  1. Remove spark plugs. Refer to Exploded View .
  2. Remove the valve lifter.
    NOTE: Confirm installation point to return valve lifter to original location during assembly.
  3. Compress the valve spring with suitable tool (A), (B) and (C) and remove the valve collet with a suitable magnetic tool.
    GNSJPBIA0180Z-180Courtesy of NISSAN NORTH AMERICA, INC.
    CAUTION:
    • Be careful not to damage valve lifter holes.
    • The center of the suitable tool (A) and valve spring retainer (1) must be aligned.
      GNSJPBIA6339Z-339Courtesy of NISSAN NORTH AMERICA, INC.
  4. Remove valve spring retainer and valve spring (with valve spring seat).
    CAUTION: Do not remove valve spring seat from valve spring.
  5. Push valve stem to combustion chamber side, and remove valve.
    • Inspect valve guide clearance. Refer to Inspection .
    • Confirm installation point to return valve to original location during assembly.
  6. Remove valve oil seal using suitable tool (A).
    G08686158Courtesy of NISSAN NORTH AMERICA, INC.
  7. When valve seat must be replaced:
    • Bore out old valve seat until it collapses. Boring should not continue beyond the bottom face

      of the valve seat recess in cylinder head. Set the machine depth stop to ensure this. Refer to Service Data .

      CAUTION: Do not bore excessively to prevent damage to cylinder head.
  8. When valve guide must be replaced:
    1. To remove valve guide, heat cylinder head to 110 deg. C to 130 deg. C (230 deg. F to 266 deg. F) by soaking in heated oil (A).
      G04811725Courtesy of NISSAN NORTH AMERICA, INC.
      WARNING: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
    2. Drive out valve guide using suitable tool.
      G04073066Courtesy of NISSAN NORTH AMERICA, INC.
  9. Remove spark plug tubes (if necessary) using suitable tool.
    CAUTION:
    • Do not damage cylinder head.
    • Do not remove spark plug tube if not necessary. Once removed, the spark plug tube cannot be reused because of deformation during removal.
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