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Disassembly and Assembly

WARNING: This page is about a different car, the 2023 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

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.
    GNSDB46690Courtesy of NISSAN
    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 .

    Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center. Remove connecting rod cap.

    CAUTION:

    Identify the original positions for installation and store the connecting rod caps without mixing them up.

    Using a suitable tool, push piston and connecting rod assembly out through the cylinder head side.

    GNSDB34581Courtesy of NISSAN
    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.
      GNSDB47188Courtesy of NISSAN
      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: Using suitable tool (A), remove snap rings.
    GNSDB47604Courtesy of NISSAN
    CAUTION:

    Do not reuse snap rings.

    Heat piston to 60 to 70°C (140 to 158°F) with a suitable tool (A).

    GNSDB46820Courtesy of NISSAN

    Push out piston pin with a suitable tool (A) with an outer diameter approximately 18 mm (0.71 in).

    GNSDB47006Courtesy of NISSAN
  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, below.
      GNSDB46688Courtesy of NISSAN
      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).
      GNSDB47394Courtesy of NISSAN
    • 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.

ASSEMBLY 

  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 drain plug (1) to cylinder block.
    GNSDB46690Courtesy of NISSAN
    SYMBOL : Engine front
    NOTE: SYMBOL
  3. Install main bearings and thrust bearings using the following procedure: Remove dust, dirt, and engine oil on the bearing mating surfaces of cylinder block and main bearing cap. Install thrust bearings to the both sides of the No. 3 journal housing (B) on cylinder block.
    GNSDB47343Courtesy of NISSAN
    SYMBOL : Engine front
    • Install thrust bearings with the oil groove (A) facing crankshaft arm (outside).

    Install the main bearings paying attention to the direction.

    • 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 (0.0335 in) or less when installing.
      GNSDB46943Courtesy of NISSAN
      (2) : Cylinder block
      (4) : Main bearing cap
    • Ensure the oil holes on cylinder block and oil holes (A) on the main bearings (1) are aligned.
      GNSDB37411Courtesy of NISSAN
  4. Install signal plate to crankshaft if removed. Set the signal plate with the flange facing toward the counter weight side (engine front side) to the crankshaft rear surface. Apply new engine oil to threads and seat surfaces of bolts. Install dowel pin (service part) into hole on crankshaft. Position crankshaft and signal plate using a dowel pin (service part) and tighten bolts to the specified torque.
    NOTE: SYMBOL Dowel pin of crankshaft and signal plate is provided as a set for each.
    Signal plate bolts : 20.0 N.m (2.0 kg-m, 15 ft-lb)

    Remove dowel pin.

    CAUTION:

    Be sure to remove dowel pin.

  5. Install crankshaft to cylinder block.
    • While turning crankshaft by hand, check that it turns smoothly.
  6. Install main bearing caps using the following procedure: Install main bearing caps referring to the journal No. stamp (A) and front mark (B) as shown.
    GNSDB48178Courtesy of NISSAN
    NOTE: SYMBOL Main bearing cap cannot be replaced as a single part because it is machined together with cylinder block.
    SYMBOL : Engine front

    Tighten main bearing cap bolts using the following procedure:

    1. Tighten main bearing cap bolts to the specified torque in the sequence shown, below.
      Fig 1: Main Bearing Cap Bolt Tightening Sequence
      GNSDB46688Courtesy of NISSAN
      Main bearing cap bolts : 34.3 N.m (3.5 kg-m, 25 ft-lb)
      SYMBOL : Engine front
    2. Tighten main bearing cap bolts to the specified angle in the sequence shown, below.
      GNSDB47002Courtesy of NISSAN
      CAUTION:

      Confirm the tightening angle by using Tool (A). Do not judge by visual inspection without the Tool.

      Tool number (A) : KV10112100 (BT-8653-A)
      Tightening angle : 60° - 65°
    • After installing bolts, check that crankshaft can be rotated smoothly by hand.
    • Check crankshaft end play. Refer to Inspection .
  7. Install piston to connecting rod with the following procedure: Using suitable tool, install new snap ring to the groove of the piston rear side.
    • Insert it fully into groove to install.
      CAUTION:

      Do not reuse snap rings.

    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 (D) on connecting rod are positioned as shown.
      GNSDB47780Courtesy of NISSAN
      (C) : Engine type
      (E) : Big end diameter grade
      (F) : Small end diameter grade
      (G) : Front mark (connecting rod cap)
      H. : Management code

    Install new snap ring to the groove of the piston front side.

    • Insert it fully into groove to install.
      CAUTION:

      Do not reuse snap rings.

    • After installing, check that connecting rod moves smoothly.
  8. Using a suitable tool (A), install piston rings.
    GNSDB34987Courtesy of NISSAN
    CAUTION:
    • Be careful not to damage piston.
    • Be careful not to damage piston rings by expanding them excessively.
    • Position end gaps of each piston ring as shown when referring to the piston front mark (E).
      GNSDB48236Courtesy of NISSAN
      CAUTION:

      Do not allow the rail end gap under the oil ring to contact the oil drain cast groove of piston.

      (B) : 90°
      (C) : Oil ring upper or lower rail gap
      (D) : 45°
      (F) : Second ring gap
      (G) : Top ring gap
    • Install second ring and top ring with the stamped mark (A) facing upward.
      Stamped mark:  
      Top ring : 1N
      Second ring : 2N
  9. Install connecting rod bearing [upper (2) ] and connecting rod bearing [lower (3) ] to connecting rod (1) and connecting rod cap (4).
    GNSDB47389Courtesy of NISSAN
    (D) : 2.05 - 2.45 mm (0.0807 - 0.0965 in)
    (E) : OK
    (F) : NG
    (G) : View G
    (H) : Oil hole
    SYMBOL : Engine front
    • Install the connecting rod in the dimension shown.
    • Check that connecting rod bearing oil hole (B) is completely in the inside of connecting rod oil hole chamfered area (C).
    • 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: SYMBOL
      • There is no positioning tab.
      • Install the connecting rod bearings in the center of connecting rod and connecting rod cap as shown. For service operation, the center position can be checked, visually.
  10. 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 (D) on connecting rod to install.
      GNSDB47780Courtesy of NISSAN
      (B) : Oil hole
      (C) : Engine type
      (E) : Big end diameter grade
      (F) : Small end diameter grade
      (G) : Front mark (connecting rod cap)
      (H) : Management code
    • Install so that front mark (A) on the piston head faces the front of engine.
    • Using a suitable tool (A), install piston and connecting rod assembly with the front mark on the piston head facing the front of the engine.
      GNSDB34283Courtesy of NISSAN
      CAUTION:

      Be careful not to damage the cylinder wall and crankshaft pin, resulting from an interference of the connecting rod big end.

  11. Install connecting rod cap.
    • Match the stamped cylinder number marks (D) on connecting rod with those on connecting rod cap to install.
      GNSDB47780Courtesy of NISSAN
      (A) : Front mark (piston)
      (B) : Oil hole
      (C) : Engine type
      (E) : Big end diameter grade
      (F) : Small end diameter grade
      (G) : Front mark (connecting rod cap)
      (H) : Management code
  12. Tighten connecting rod cap bolt using the following procedure:
    CAUTION:
    • Check that there is no gap in the thrust surface (A) of the joint between connecting rod (1) and connecting rod cap (2) and that these parts are in the correct position. And then, tighten the connecting rod cap bolts.
      GNSDB47386Courtesy of NISSAN
    • If the connecting rod cap bolts are reused, measure the outer diameter. Refer to Inspection .

    Apply new engine oil to the threads and seats of connecting rod cap bolts. Tighten connecting rod cap bolts to the specified torque.

    Connecting rod cap bolts : 33.0 N.m (3.4 kg-m, 24 ft-lb)

    Completely loosen connecting rod cap bolts.

    Connecting rod cap bolts : 0 N.m (0 kg-m, 0 ft-lb)

    Tighten connecting rod cap bolts to the specified torque.

    Connecting rod cap bolts : 19.6 N.m (2.0 kg-m, 14 ft-lb)

    Then tighten connecting rod cap bolts to the specified angle using Tool (A).

    GNSDB47945Courtesy of NISSAN
    CAUTION:

    Check and confirm the tightening angle by using a Tool. Do not judge by visual inspection without the Tool.

    Tool number : KV10112100 (BT-8653-A)
    Tightening angle : 60° - 65°
    • After tightening connecting rod cap bolt, check that crankshaft rotates smoothly.
    • Check the connecting rod side clearance. Refer to Inspection .
  13. Install oil pan (upper). Refer to Removal and Installation .
    NOTE: SYMBOL Install the rear oil seal after installing the oil pan (upper).
  14. Install rear oil seal. Refer to Removal and Installation .
  15. Install drive plate (CVT models only). Refer to Removal and Installation .
  16. Install flywheel (M/T models only). Refer to Removal and Installation .
  17. Install knock sensor (1) with harness connector facing toward the rear of engine.
    GNSDB47059Courtesy of NISSAN
    CAUTION:
    • Do not tighten bolt while holding the harness connector.
    • If any impact by dropping is applied to knock sensor, replace it with a new one.
    NOTE: SYMBOL
    • Check that there is no foreign material on the cylinder block mating surface and the back surface of knock sensor.
    • Check that knock sensor does not interfere with other parts.
    (A) : Cylinder block left side
    SYMBOL : Engine front
  18. Assembly of the remaining components is in the reverse order of disassembly.
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