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Home >> Nissan-Datsun >> 2020 >> Sentra SR >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical >> Unit Disassembly And Assembly >> Cylinder Block >> Disassembly and Assembly >> Disassembly

Disassembly and Assembly: Disassembly

  1. Remove the cylinder head. Refer to Removal and Installation .
  2. Remove the oil pan (upper). Refer to Removal and Installation .
  3. Remove the water pump housing. Refer to Removal and Installation .
  4. Remove the engine oil pressure sensor and engine oil temperature sensor.
  5. Remove the knock sensor.
    CAUTION: Handle it carefully and avoid impacts.
  6. Remove drain plug (1) from cylinder block.
    GNSJSBIA5916Z-916Courtesy of NISSAN NORTH AMERICA, INC.

    SYMBOL

    : Engine front
  7. Remove piston and connecting rod assembly using the following procedure:
    • Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer to Inspection .
    1. Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.
    2. Remove connecting rod cap.
      CAUTION: Identify the original positions for installation and store the connecting rod caps without mixing them up.
    3. Using a suitable tool, push piston and connecting rod assembly out through the cylinder head side.
      G04146443Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION:
      • Be careful not to damage matching surface with connecting rod cap.
      • Be careful not to damage the cylinder wall or crankshaft pin, resulting from an interference of the connecting rod big end.
  8. Remove connecting rod bearings.
    CAUTION: Identify the original positions for installation and store the connecting rod bearings without mixing them up.
  9. Remove piston rings from piston.
    • Before removing piston rings, check the piston ring side clearance. Refer to Inspection .
    • Use suitable tool (A) to remove piston rings as shown in the illustration.
      GNSJSBIA2493Z-493Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION:
      • When removing piston rings, be careful not to damage the piston.
      • Be careful not to damage piston rings by expanding them excessively.
  10. Remove piston from connecting rod using the following procedure:
    1. Using suitable tool (A), remove snap rings.
      GNSJSBIA2494Z-494Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION: Do not reuse snap rings.
    2. Heat piston to 60 to 70 deg.C (140 to 158 deg.F) with a suitable tool (A).
      GNSJSBIA2495Z-495Courtesy of NISSAN NORTH AMERICA, INC.
    3. Push out piston pin with a suitable tool (A) with an outer diameter approximately 18 mm (0.71 in).
      GNSJSBIA2496Z-496Courtesy of NISSAN NORTH AMERICA, INC.
  11. Remove main bearing cap bolts.
    • Measure crankshaft end play before loosening main bearing cap bolts. Refer to Inspection .
    • Loosen and remove main bearing cap bolts in reverse of the sequence shown in the illustration.
      Fig 1: Main Bearing Cap Bolts Tightening Sequence
      GNSJSBIA4604Z-604Courtesy of NISSAN NORTH AMERICA, INC.

      SYMBOL

      : Engine front
  12. Remove main bearing caps.
    • Tap main bearing caps lightly with a suitable tool for removal.
      CAUTION: Be careful not to damage the mounting surface.
  13. Remove crankshaft.
    CAUTION:
    • Be careful not to damage or deform signal plate (1) mounted on rear end of crankshaft (A).
      G04811754Courtesy of NISSAN NORTH AMERICA, INC.
    • When setting crankshaft on a flat floor surface, use a block of wood to avoid interference between signal plate and the floor surface.
    • Do not remove signal plate unless it is necessary to do so.
  14. Remove the signal plate from the crankshaft (if necessary).
  15. Pull rear oil seal out from rear end of crankshaft.
    CAUTION: Do not reuse rear oil seal.
  16. Remove main bearings and thrust bearings from cylinder block and main bearing caps.
    CAUTION: Identify original installation positions and store main bearings and thrust bearings without mixing them up.
  17. Remove the oil jets.
  18. Inspect dowel pins, welch plugs and threaded plugs and remove if necessary.
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