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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 >> Assembly

Disassembly and Assembly: Assembly

WARNING: This page is about a different variant/trim than selected.
  1. Fully air-blow engine coolant and engine oil passages in cylinder block, cylinder bore and crankcase to remove any foreign material.
    CAUTION: Use a goggles to protect your eye.
  2. Install water drain plug (1) to cylinder block.
  3. Remove dust, dirt, and engine oil on the bearing mating surfaces of cylinder block and main bearing cap.
    Fig 1: Identifying Water Drain Plug
    G04924638Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Install thrust bearings to the both sides of the No. 3 journal housing (B) on cylinder block.
    • Install thrust bearings with the oil groove (A) facing crankshaft arm (outside).
      Fig 2: Locating Oil Groove
      G04924639Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Install the main bearings paying attention to the direction.
    CAUTION:
    • Before installing main bearings, apply new engine oil to the bearing surface (inside). Do not apply new engine oil to the back surface, but thoroughly clean it.
    • When installing, align main bearing to the center position of cylinder block and main bearing cap.
    • The difference (A) between main bearing upper (1) and main bearing lower (3) should be 0.85 mm (0.033 in) or less when installing.
      Fig 3: Identifying Main Bearing Upper And Main Bearing Lower
      G04924640Courtesy of NISSAN MOTOR CO., U.S.A.
    • Ensure the oil holes on cylinder block and oil holes (A) on the main bearings (1) are aligned.
      Fig 4: Identifying Oil Holes On Main Bearings
      G04924641Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Install signal plate to crankshaft if removed.
  7. Set the signal plate with the flange facing toward the counter weight side (engine front side) to the crankshaft rear surface.
  8. Apply new engine oil to threads and seat surfaces of bolts.
  9. Position crankshaft (2) and signal plate (1) using a dowel pin (service part), and tighten bolts in numerical order as shown.
    NOTE: Dowel pin of crankshaft and signal plate is provided as a set for each.
  10. Tighten bolts in numerical order as shown.
  11. Remove dowel pin. (service parts)
    CAUTION: Be sure to remove dowel pin.
    Fig 5: Identifying Dowel Pin On Crankshaft And Signal Plate
    G04924642Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Install crankshaft to cylinder block.
    • While turning crankshaft by hand, make sure that it turns smoothly.
  13. Install main bearing caps referring to the journal No. stamp (A) and front mark (B) as shown.
    NOTE: Main bearing cap cannot be replaced as a single part, because it is machined together with cylinder block.
    Fig 6: Identifying Journal No. Stamp And Front Mark
    G04924643Courtesy of NISSAN MOTOR CO., U.S.A.
  14. Apply new engine oil to threads and seat surfaces of bolts.
  15. Tighten main bearing cap bolts in two steps.
    NOTE: Tighten main bearing cap bolts in numerical order as shown:

    Step 1 : 34.3 N.m (3.5 kg-m, 25 ft-lb) 

    Step 2 60° clockwise 

    Fig 7: Identifying Main Bearing Cap Bolts
    G04924644Courtesy of NISSAN MOTOR CO., U.S.A.

    Tool number : KV10112100 (BT-8653-A) 

    Fig 8: Tightening Main Bearing Cap Bolts
    G04924645Courtesy of NISSAN MOTOR CO., U.S.A.
    • After installing bolts, make sure that crankshaft can be rotated smoothly by hand.
    • Check crankshaft end play. Refer to "CRANKSHAFT END PLAY ".
  16. Using snap ring pliers, install new snap ring to the groove of the piston rear side.
    • Insert it fully into groove to install.
  17. Assemble piston to connecting rod.
    • Using a suitable tool, heat the piston until the piston pin can be pushed in by hand without excess force [approximately 60° to 70°C (140° to 158°F)]. From the front to the rear, insert piston pin into piston and connecting rod.
    • Assemble so that the front mark (A) on the piston head and the oil hole (B) and the cylinder number (C) on connecting rod are positioned as shown.
  18. Install new snap ring to the groove of the piston front side.
    • Insert it fully into groove to install.
    • After installing, make sure that connecting rod moves smoothly.
      Fig 9: Identifying Mark On Piston Head And Oil Hole
      G04924646Courtesy of NISSAN MOTOR CO., U.S.A.
  19. Using a suitable tool, install piston rings.
    CAUTION:
    • Be careful not to damage piston.
    • Be careful not to damage piston rings by expanding them excessively.
    • Position each ring with the gap as shown referring to the piston front mark.
      Fig 10: Identifying Piston Ring Gap Position
      G04924647Courtesy of NISSAN MOTOR CO., U.S.A.
      CAUTION: Never contact the rail end gap under the oil ring with the oil drain cast groove of piston.
    • Install second ring with the stamped surface facing upward.
  20. Install connecting rod bearing upper (2) and lower (3) to connecting rod (1) and connecting rod cap (4).
    • Install the connecting rod in the dimension shown.
    • Make sure that connecting rod bearing oil hole (A) is completely in the inside of connecting rod oil hole chamfered area (B).
    • When installing connecting rod bearings, apply new engine oil to the bearing surface (inside). Do not apply new engine oil to the back surface, but thoroughly clean it.
      NOTE:
      • There is no positioning tab.
      • Install the connecting rod bearings in the center of connecting rod and connecting rod bearing cap as shown. For service operation, the center position can be checked, visually.
        Fig 11: Identifying Connecting Rod Bearing Upper And Lower To Connecting Rod And Connecting Rod Cap
        G04924648Courtesy of NISSAN MOTOR CO., U.S.A.
  21. Install piston and connecting rod assembly to crankshaft.
    • Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.
    • Apply new engine oil sufficiently to the cylinder bore, piston and crankshaft pin.
    • Match the cylinder position with the cylinder number (C) on connecting rod to install.
      Fig 12: Identifying Match On Cylinder Position With Cylinder Number On Connecting Rod
      G04924649Courtesy of NISSAN MOTOR CO., U.S.A.
    • Install so that front mark (A) on the piston head faces the front of engine.
    • Using a piston ring compressor [SST: EM03470000 (J-8037)] (A) or suitable tool, install piston with the front mark on the piston head facing the front of the engine.
      CAUTION: Be careful not to damage the cylinder wall and crankshaft pin, resulting from an interference of the connecting rod big end.
      Fig 13: Tapping Piston Using Piston Ring Compressor
      G04924650Courtesy of NISSAN MOTOR CO., U.S.A.
  22. Install connecting rod cap.
    • Match the stamped cylinder number marks (C) on connecting rod with those on connecting rod cap to install.
      Fig 14: Identifying Piston, Connecting Rod Mark And Number
      G04924651Courtesy of NISSAN MOTOR CO., U.S.A.
  23. Tighten connecting rod bolt with the following procedure:
    CAUTION:
    • Make sure that there is no gap in the thrust surface (A) of the joint between connecting rod (1) and connecting rod bearing cap (2) and that these parts are in the correct position. And then, tighten the connecting rod bolts.
    • If the connecting rod bolts are reused, measure the outer diameter. Refer to "CONNECTING ROD BOLT OUTER DIAMETER ".
  24. Apply new engine oil to the threads and seats of connecting rod bolts.
  25. Tighten bolts in three steps
    Fig 15: Identifying Thrust Surface Of Joint Between Connecting Rod And Connecting Rod Bearing Cap
    G04924652Courtesy of NISSAN MOTOR CO., U.S.A.

    Step 1 : 27.4 N.m (2.8 kg-m, 20 ft-lb) 

    Step 2 : 0 N.m (0 kg-m, 0 ft-lb) 

    Step 3 : 19.6 N.m (2.0 kg-m, 14 ft-lb) 

    • After tightening connecting rod bolt, make sure that crankshaft rotates smoothly.
    • Check the connecting rod side clearance. Refer to "CONNECTING ROD SIDE CLEARANCE ".
  26. Install oil pan (upper). Refer to "OIL PAN ".
    NOTE: Install the rear oil seal after installing the oil pan (upper).
  27. Install rear oil seal. Refer to "OIL PAN ".
  28. Install flywheel (M/T models) or drive plate (1) (CVT models).
    • Secure crankshaft using Tool. (A), and tighten bolts crosswise over several times.

      Tool number : KV11105210 (J-44716) 

      Fig 16: Identifying Flywheel Or Drive Plate
      G04924653Courtesy of NISSAN MOTOR CO., U.S.A.
    • Install pilot converter (1), drive plate (2) and reinforcement plate (3) as shown (CVT models).
    • Using a suitable tool of 33 mm. (1.30 in) in diameter, press-fit pilot converter into the end of crankshaft until it stops (CVT models).
      NOTE: M/T models have no pilot converter and reinforcement plate.
      Fig 17: Identifying Pilot Converter, Drive Plate And Reinforcement Plate
      G04924654Courtesy of NISSAN MOTOR CO., U.S.A.
  29. Install knock sensor (1) with connector facing toward the rear of engine.
    CAUTION:
    • Never tighten bolts while holding the connector.
    • If any impact by dropping is applied to knock sensor, replace it with a new one.
    NOTE:
    • Make sure that there is no foreign material on the cylinder block mating surface and the back surface of knock sensor.
    • Make sure that knock sensor does not interfere with other parts.
      Fig 18: Identifying Knock Sensor
      G04924655Courtesy of NISSAN MOTOR CO., U.S.A.
  30. Install crankshaft position sensor (POS) and crankshaft position sensor (POS) cover.
    CAUTION:
    • Avoid impacts such as a dropping.
    • Keep it away from metal particles.
    • Never place sensor in a location where it is exposed to magnetism.
  31. Install oil filter (for intake valve timing control) (1) in the direction shown.
    • Make sure that the oil filter does not protrude from the upper surface of cylinder block (2) after installation.
      Fig 19: Identifying Oil Filter
      G04924656Courtesy of NISSAN MOTOR CO., U.S.A.
  32. Assemble in the reverse order of disassembly.
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