LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 412 (Engine Mechanical - 2.5L) >> Cylinder Block >> Disassembly and Assembly >> Disassembly

Disassembly and Assembly: Disassembly

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the engine and transaxle as an assembly from the vehicle, and separate the transaxle from the engine. Refer to Removal and Installation  .
  2. Mount the engine on a suitable engine stand.
  3. Drain any remaining engine oil and coolant from the engine.
  4. Remove the following components and associated parts.
  5. Remove the knock sensor.
    CAUTION: Carefully handle the sensor and do not drop the sensor.
  6. Remove crankshaft position sensor (POS).
    CAUTION:
    • Avoid impacts such as a dropping.
    • Do not disassemble.
    • Keep it away from metal particles.
    • Do not place sensor close to magnetic materials.
    Fig 1: Removing & Installing Crankshaft Position Sensor
    G02110406Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Remove the flywheel (M/T models) or drive plate (A/T models). Hold the crankshaft with a stopper plate and remove the mounting bolts.
    CAUTION:
    • Be careful not to damage the flywheel contact surface for the clutch disc.
    NOTE:
    • The flywheel two-block construction allows movement in response to transmission side pressure, or when twisted in its rotational direction, therefore, some amount of noise is normal.
    Fig 2: Remove Flywheel
    G02110407Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Remove pilot converter using Tool (A/T models).
    Fig 3: Remove Pilot Converter
    G02110408Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Remove the piston and connecting rod assemblies.
    1. Position the crankshaft and corresponding connecting rod, to be removed, to the bottom dead center stroke.
    2. Remove the connecting rod cap. Number the cap so it can be assembled in the same position.
    3. Using a hammer handle or similar tool, push the piston and connecting rod assembly out of the top of the cylinder block. Number the piston and rod so it can be assembled in the same position.
      4. Fig 4: Remove Piston & Connecting Rod Assembly
      G02110409Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Remove the connecting rod bearings. If reusing, number them so they can be assembled in the same position and direction.
    CAUTION:
    • When removing them, note the installation position. Keep them in the correct order.
  11. Remove the piston rings from the piston.
    • Use a piston ring expander.
      • Fig 5: Removing Piston Rings
      G02110410Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION:
    • When removing the piston rings, be careful not to damage the piston.
    • Be careful not to damage piston rings by expanding them excessively, if reusing them.
    • Before removing the piston rings, check the piston ring side clearance. Refer to PISTON RING SIDE CLEARANCE  .
  12. Remove the piston from the connecting rod as follows.
    1. Using a snap ring pliers, remove the two snap rings.
      Fig 6: Remove 2 snap rings
      G02110411Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Heat the piston to 60° - 70°C (140° - 158°F) with a heat gun, or equivalent.
      Fig 7: Heating Up Piston
      G02110412Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Push out piston pin with a punch of an outer diameter of approximately 19 mm (0.75 in).
    Fig 8: remove piston pin
    G02110413Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Remove the lower cylinder block mounting bolts.
    • Before loosening the lower cylinder block mounting bolts, measure the crankshaft side clearance. Refer toCRANKSHAFT SIDE CLEARANCE  .
    • Loosen them in the order shown to remove them.
    Fig 9: View Of Lower Cylinder Block Loosening Sequence
    G02110414Courtesy of NISSAN MOTOR CO., U.S.A.
  14. Remove the lower cylinder block.
    • Using Tool (seal cutter) cut the RTV Silicone Sealant and remove the lower cylinder block from the cylinder block.
    CAUTION: Be careful not to damage the mounting surface.
  15. Remove the crankshaft.
    CAUTION:
    • Do not damage or deform the signal plate while mounted on the crankshaft.
      • Fig 10: View Of Signal Plate
      G02110415Courtesy of NISSAN MOTOR CO., U.S.A.
    • When setting the crankshaft on a flat surface, use a block of wood to avoid interference between the signal plate and the surface.
    • Do not remove signal plate unless it is necessary.
  16. Pull the rear oil seal out of the rear end of the crankshaft. 
    CAUTION: Do not to damage the crankshaft or cylinder block when removing the rear oil seal.
    NOTE: When replacing the rear oil seal without removing the cylinder block, use a screwdriver to pull it out from between crankshaft and block.
  17. Remove the main bearings and thrust bearings from the cylinder block and lower cylinder block.
    CAUTION: Identify and number the bearings, if reusing them, so that they are assembled in the same position and direction.
scientia non olet · About LEMON Manuals