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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical (5.6L)) >> Removal And Installation >> Cylinder Head >> Disassembly and Assembly >> Disassembly

Disassembly and Assembly: Disassembly

WARNING: This page is about a different variant/trim than selected.
  1. Remove valve collet.
    GNSJPBIA1365Z-365Courtesy of NISSAN NORTH AMERICA, INC.
    • Compress valve spring with suitable tool (A/B/C). Remove valve collet with a magnet hand.
    CAUTION: When working, take care not to damage valve lifter holes.
  2. Remove valve spring retainer and valve spring (with valve spring seat).
  3. Push valve stem to combustion chamber side, and remove valve.
    • Identify installation positions, and store them without mixing them up.
  4. Remove valve oil seal using suitable tool (A).
    GNSJPBIA1366Z-366Courtesy of NISSAN NORTH AMERICA, INC.
  5. Remove valve seat (EXH) and valve seat (INT), if valve seat (EXH) or valve seat (INT) must be replaced.
    • Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess in cylinder head. Set the machine depth stop to ensure this. Refer to Cylinder Head .
      CAUTION: Prevent to scratch cylinder head by excessive boring.
  6. Remove valve guide (EXH), if valve guide (EXH) must be replaced.
    1. To remove valve guide (EXH), heat cylinder head to 110 to 130 deg.C (230 to 266 deg.F) by soaking in heated oil (A).
      GNSJPBIA0184Z-184Courtesy of NISSAN NORTH AMERICA, INC.
    2. Drive out valve guide (EXH) with a press [under a 20 kN (2 ton, 2.2 US ton, 2.0 lmp ton) pressure] or a hammer and suitable tool.
      G04073066Courtesy of NISSAN NORTH AMERICA, INC.
      WARNING: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
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