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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 503 (Engine Mechanical (4.0L)) >> Removal And Installation >> Cylinder Head >> Disassembly and Assembly >> Disassembly

Disassembly and Assembly: Disassembly

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove spark plug.
  2. Remove valve lifter.
    • Identify installation positions, and store them without mixing them up.
  3. Remove valve collet.
    G04146417Courtesy of NISSAN NORTH AMERICA, INC.
    • Compress valve spring and remove valve collet with magnet hand using suitable tool.
    CAUTION: Do not damage valve lifter holes.
  4. Remove valve spring retainer, valve spring and valve spring seat.
  5. Push valve stem to combustion chamber side, and remove valve.
    • Identify installation positions, and store them without mixing them up.
  6. Remove valve oil seals using suitable tool.
    G04146732Courtesy of NISSAN NORTH AMERICA, INC.
  7. If valve seat must be replaced, refer to Inspection After Disassembly .
  8. If valve guide must be replaced, refer to Inspection After Disassembly .
  9. Remove spark plug tube (if necessary).
    • Pull spark plug tube out of cylinder head using suitable tool.
    CAUTION:
    • Take care not to damage cylinder head.
    • Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it unless absolutely necessary.
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