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Home >> Nissan-Datsun >> 2008 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical (MR20DE)) >> Cylinder Block >> Disassembly and Assembly >> Disassembly

Disassembly and Assembly: Disassembly

WARNING: This page is about a different variant/trim than selected.
  1. Remove engine and transaxle assembly from vehicle, separate transaxle from engine. Refer to "ENGINE ASSEMBLY ".
  2. Install engine to engine stand as follows;
    1. Remove flywheel (M/T models) or drive plate (1) (CVT models).
      • Secure flywheel (M/T models) or drive plate (CVT models) using Tool (A), and remove bolts.

        Tool number : KV 11105210 (J-44716) 

        CAUTION: Be careful not to damage or scratch drive plate (CVT models) and contact surface for clutch disc of flywheel (M/T models).
        NOTE: Figure shows drive plate (CVT models)
        Fig 1: Identifying Flywheel Or Drive Plate
        G04924628Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Lift the engine with a hoist to install it onto widely use engine stand.
      CAUTION:
      • Use the engine stand that has a load capacity [approximately 135 kg (298 lb) or more] large enough for supporting the engine weight. 
      • If the load capacity of stand is not adequate, remove the following parts beforehand to reduce the potential risk of overturning stand.
      NOTE: The figure shows an example of widely used engine stand (A) that can support mating surface of transaxle with flywheel (M/T models) or drive plate (CVT models) removed.
      CAUTION: Before removing the hanging chains, make sure the engine stand is stable and there is no risk of overturning.
      Fig 2: Identifying Engine Stand
      G04924629Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Remove oil pan (upper and lower). Refer to "OIL PAN ".
  4. Remove cylinder head. Refer to "CYLINDER HEAD ".
  5. Remove thermostat housing. Refer to "THERMOSTAT ".
  6. Remove knock sensor.
    CAUTION: Carefully handle knock sensor avoiding shocks.
  7. Remove crankshaft position sensor (POS) cover and crankshaft position sensor (POS).
    CAUTION:
    • Avoid impacts such as a dropping.
    • Never disassemble.
    • Keep it away from metal particles.
    • Never place sensor in a location where it is exposed to magnetism.
  8. Remove oil filter (for intake valve timing control).
  9. Remove pilot converter (1) using Tool (A). (CVT models)

    Tool number :ST16610001 (J-23907) 

    NOTE: M/T models have no pilot converter.
    Fig 3: Identifying Pilot Converter
    G04924630Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.
    NOTE: Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer to "CONNECTING ROD SIDE CLEARANCE ".
  11. Remove connecting rod cap.
  12. Using a suitable tool, push piston and connecting rod assembly out to the cylinder head side.
    CAUTION:
    • Be careful not to damage matching surface with connecting rod cap.
    • Be careful not to damage the cylinder wall and crankshaft pin, resulting from an interference of the connecting rod big end.
      Fig 4: Pushing Piston And Connecting Rod Assembly
      G04885832Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Remove connecting rod bearings.
    CAUTION: When removing them, note the installation position. Keep them in the correct order.
  14. Remove piston rings form piston.
  15. Using a suitable tool (A) remove piston rings.
    CAUTION:
    • When removing piston rings, be careful not to damage the piston.
    • Be careful not to damage piston rings by expanding them excessively.
      Fig 5: Removing Piston Rings
      G04924632Courtesy of NISSAN MOTOR CO., U.S.A.
  16. Using snap ring pliers (A), remove snap rings.
    Fig 6: Removing Snap Rings
    G04924633Courtesy of NISSAN MOTOR CO., U.S.A.
  17. Heat piston to 60° to 70°C (140° to 158°F) using a suitable tool (A).
    Fig 7: Heating Piston
    G04924634Courtesy of NISSAN MOTOR CO., U.S.A.
  18. Push out piston pin using a suitable tool of an outer diameter approximately 18 mm (0.71 in).
    Fig 8: Pushing Out Piston Pin
    G04878460Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Loosen main bearing cap bolts in reverse order as shown, and remove them.
    NOTE: Before loosening main bearing cap bolts, measure crankshaft end play. Refer to "CRANKSHAFT END PLAY ".
  20. Remove main bearing caps.
    • Tap main bearing caps lightly using a suitable tool for removal.
      CAUTION: Be careful not to damage the mounting surface.
      Fig 9: Identifying Main Bearing Caps Bolts
      G04924636Courtesy of NISSAN MOTOR CO., U.S.A.
  21. Remove crankshaft.
    CAUTION:
    • Be careful not to damage or deform signal plate (1) mounted on rear end of crankshaft (A).
    • When setting crankshaft on a flat floor surface, use a block of wood to avoid interference between signal plate and the floor surface.
    • Never remove signal plate unless it is necessary to do so.
  22. Pull rear oil seal out from rear end of crankshaft.
  23. Remove main bearings and thrust bearings from cylinder block and main bearing caps.
    Fig 10: Identifying Signal Plate Mounted Crankshaft
    G04924637Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION: Identify installation positions, and store them without mixing them up.
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