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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1040 (Engine Mechanical - QG18DE) >> Cylinder Block >> Assembly >> Crankshaft

Cylinder Block: Assembly: Crankshaft

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  1. Install signal plate to crankshaft using dowel pin to properly position the signal plate. Remove the dowel pin after the signal plate bolts are tightened. Tighten the signal plate bolts.
    1. Signal plate bolts : 7.64 - 9.22 N.m (0.78 - 0.94 kg-m, 67.7 - 81.6 in-lb) 
    2. Dowel pin diameter : 6 mm (0.24 in) 
    Fig 1: Installing Signal Plate To Crankshaft Using Dowel Pin
    G00774113Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Set main bearings in their proper positions on cylinder block and main bearing cap.
    • Confirm that correct main bearings are selected by using Method A or Method B. Refer to , "BEARING CLEARANCE ".
    • Apply new engine oil to bearing surfaces.
    Fig 2: Setting Main Bearings In Their Proper Positions On Main Bearing Cap
    G00774114Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 3: Identifying Main Bearing
    G00774115Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Install crankshaft and main bearing caps and tighten bolts in the order shown.
    1. Main bearing cap bolts : 46.1 - 52.0 N.m (4.780 - 5.30 kg-m, 34.0 - 38.8 ft-lb) 
    • Apply new engine oil to the bolt thread and seat surface.
    • Prior to tightening bearing cap bolts, shift crankshaft back and forth to properly seat the bearing caps.
    • Tighten bearing cap bolts gradually in two or three stages. Start with center bearing and move outward as shown in figure.
    • After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
    Fig 4: Identifying Tightening Sequence Of Crankshaft And Main Bearing Caps Bolts
    G00774116Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Measure crankshaft free end play.
    1. Crankshaft free end play 
      1. Standard 0.060 - 0.220 mm (0.0024 - 0.0087 in) 
      2. Limit 0.3 mm (0.012 in) 
    • If beyond the limit, replace thrust bearing with new ones.
    Fig 5: Measuring Crankshaft Free End Play
    G00774117Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Install connecting rod bearings in connecting rods and connecting rod caps.
    • Confirm that correct bearings are used. Refer to , "CONNECTING ROD BEARING ".
    • Install bearings so that oil hole in connecting rod aligns with oil hole of bearing.
    • Apply new engine oil to bolt threads and bearing surfaces.
    Fig 6: Aligning Oil Hole In Connecting Rod With Oil Hole Of Bearing
    G00774118Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Install the piston and connecting rod assembly to the crankshaft. Assemble the components in their original positions.
    • Rotate the crankshaft so the pin corresponding to the connecting rod to be installed is at the bottom dead center position.
    • Apply engine oil sufficiently to the cylinder bore, piston, and crankshaft pin.
    • Match the cylinder position number with the cylinder No. on the connecting rod for installation.
    • Using a piston ring compressor, install the piston with the front mark on the piston crown facing the front of the engine.
    CAUTION: Be careful not to damage the crankshaft pin, resulting from an interference of the connecting rod big end.
    Fig 7: Installing Piston And Connecting Rod Assembly To Crankshaft (1 Of 2)
    G00774119Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Install connecting rod caps.
    Fig 8: Installing Piston And Connecting Rod Assembly To Crankshaft (2 Of 2)
    G00774120Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Install connecting rod caps.
    • Apply new engine oil to bolt threads and nut seating surfaces.
    • Tighten connecting rod cap nuts in two steps using Tool.
    1. Step 1 : 13.72 - 15.68 N.m (1.399 - 1.599 kg-m, 10.120 - 11.566 ft-lb) 
    2. Step 2 : 35 - 40 degrees clockwise, or 23 - 28 N.m (2.3 - 2.9 kg-m, 17 - 21 ft-lb) 
    Fig 9: Installing Connecting Rod Caps
    G00774121Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Measure connecting rod side clearance.
    1. Connecting rod side clearance 
      1. Standard : 0.200 - 0.470 mm (0.0079 - 0.0185 in) 
      2. Limit : 0.52 mm (0.0205 in) 
    • If beyond the limit, replace connecting rod and/or crankshaft.
    Fig 10: Measuring Connecting Rod Side Clearance
    G00774122Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Install rear oil seal retainer.
    1. Before installing rear oil seal retainer, remove old Silicone RTV Sealant from cylinder block and retainer.
    2. Apply a continuous bead of Silicone RTV Sealant to rear oil seal retainer.
      • Use Genuine Silicone RTV Sealant, or equivalent. See RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS .
      • Apply around inner side of bolt holes.
        1. Rear oil seal retainer bolts : 6.28 - 8.34 N.m (0.64 - 0.85 kg-m, 55.6 - 73.8 in-lb) 
    Fig 11: Applying Continuous Bead Of Silicone RTV Sealant To Rear Oil Seal Retainer
    G00774123Courtesy of NISSAN MOTOR CO., U.S.A.
  11. Install crankshaft position sensor (POS).
    1. Crankshaft position sensor bolt : 7.2 - 10.8 N.m (0.73 - 1.10 kg-m, 63.4 - 95.5 in-lb) 
  12. Install knock sensor at correct angle.
    1. Knock sensor bolt : 15.7 - 20.6 N.m (1.6 - 2.1 kg-m, 12 - 15 ft-lb) 
    Fig 12: Knock Sensor Installation Angle
    G00774124Courtesy of NISSAN MOTOR CO., U.S.A.
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