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Home >> Infiniti >> 2012 >> G37 IPL, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical (Coupe) >> Unit Disassembly And Assembly >> Cylinder Block >> Disassembly and Assembly >> Assembly

Disassembly and Assembly: Assembly

CAUTION: Do not reuse O-rings or washers.
  1. Fully air-blow engine coolant and engine oil passages in cylinder block, cylinder bore and crankcase to remove any foreign material.
    CAUTION: Use goggles to protect your eyes.
  2. Install each plug to cylinder block as shown in the figure.
    Fig 1: Identifying Water Drain Plug, Washer And Plug
    G08233010Courtesy of NISSAN NORTH AMERICA, INC.
    • Apply sealant to the thread of water drain plug (1).

      Use Genuine RTV Silicone Sealant or equivalent. Refer to  "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".

    • Apply sealant to the thread of plug (4).
    • Use Genuine High Strength Thread Locking Sealant or equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".
    • Replace washers (2) with new ones.
      CAUTION: Do not reuse washers.
    • Tighten each plug as specified below.
      Unit: N.m (kg-m, ft-lb)
      Part Washer Tightening torque
      1 No 19.6 (2.0, 14)
      3 Yes 78.0 (8.0, 58)
      4 Yes 12.3 (1.3, 9)
  3. Install oil jet.
    • Insert oil jet dowel pin (A) into cylinder block dowel pin hole, and tighten mounting bolts.
      Fig 2: Identifying Oil Jet Dowel Pin
      G08233011Courtesy of NISSAN NORTH AMERICA, INC.
  4. Install main bearings and thrust bearings as follows:
    CAUTION: Be careful not to drop main bearing, and to scratch the surface.
    1. Remove dust, dirt, and engine oil on bearing mating surfaces of cylinder block and lower cylinder block.
    2. Install thrust bearings (1) to both sides of the No. 3 journal housing on cylinder block.
      Fig 3: Identifying Thrust Bearings And Installation Position
      G08233012Courtesy of NISSAN NORTH AMERICA, INC.
      • Install thrust bearings with the oil groove (E) facing crankshaft arm (outside).
    3. Install main bearings paying attention to the direction.
      Fig 4: Identifying Main Bearings
      G08233013Courtesy of NISSAN NORTH AMERICA, INC.
      • Main bearing with oil hole (B) and groove (C) goes on cylinder block. The one without them goes on lower cylinder block.
      • Before installing main bearings, apply engine oil to the bearing surface (inside). Do not apply engine oil to the back surface, but thoroughly clean it.
      • When installing, align main bearing stopper protrusion to cutout of cylinder block and lower cylinder block.
      • Ensure the oil holes on cylinder block and those on the corresponding bearing are aligned.
  5. Install crankshaft to cylinder block.
    • While turning crankshaft by hand, check that it turns smoothly.
  6. Install lower cylinder block.
    NOTE: Lower cylinder block cannot be replaced as a single part, because it is machined together with cylinder block.
    • Apply a continuous bead of liquid gasket with the tube presser (commercial service tool) to lower cylinder block as shown in the figure.
      Fig 5: Identifying Liquid Gasket Application Area
      G08233014Courtesy of NISSAN NORTH AMERICA, INC.

      Use Genuine RTV Silicone Sealant or equivalent. Refer to  "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".

  7. Inspect the outer diameter of lower cylinder block bolt. Refer to "INSPECTION ".
  8. Install lower cylinder block bolts in numerical order as shown in the figure as follows:
    Fig 6: Identifying Lower Cylinder Block Bolt With Tightening Sequence
    G08233015Courtesy of NISSAN NORTH AMERICA, INC.
    1. Apply new engine oil to threads and seat surfaces of lower cylinder block bolts.
    2. Tighten bolts (No. 17 to 26) in numerical order as shown in the figure.

      Tightening Torque: 35.3 N.m (3.6 kg-m, 26 ft-lb) 

      CAUTION: Do not reuse O-rings.
    3. Repeat step  b.
    4. Tighten bolts (No. 1 to 16) in numerical order as shown in the figure.
      Fig 7: Identifying Lower Cylinder Block Bolt With Tightening Sequence
      G08233016Courtesy of NISSAN NORTH AMERICA, INC.
      NOTE: Use TORX socket for bolts No. 1 to 16.

      Tightening Torque: 25.0 N.m (2.6 kg-m, 18 ft-lb) 

    5. Turn bolts (No. 1 to 16) 90 degrees clockwise (angle tightening).
      CAUTION: Use the angle wrench [SST: KV10112100 (BT8653-A)] (A) to check tightening angle. Never make judgment by visual inspection.
      Fig 8: Checking Tightening Angle Using Angle Wrench
      G08233017Courtesy of NISSAN NORTH AMERICA, INC.
      • After installing lower cylinder block bolts, check that crankshaft can be rotated smoothly by hand.
      • Check the crankshaft end play. Refer to "INSPECTION ".
  9. Install piston to connecting rod as follows:
    1. Using snap ring pliers, install new snap ring to the groove of piston rear side.
      • Insert it fully into groove to install.
    2. Install piston to connecting rod.
      • Using an industrial use dryer or similar tool, heat piston until 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 on the piston head and the cylinder number on connecting rod are positioned as shown in the figure.
        Fig 9: Identifying Piston, Pin Grade Number And Front Mark
        G08233018Courtesy of NISSAN NORTH AMERICA, INC.
    3. Install new snap ring to the groove of the piston front side.
      • Insert it fully into groove to install.
      • After installing, check that connecting rod moves smoothly.
  10. Using a piston ring expander (commercial service tool) (A), install piston rings.
    CAUTION:
    • When installing piston rings, be careful not to damage piston.
    • Be careful not to damage piston rings by expending them excessively.
      Fig 10: Checking Piston Ring Clearance Using Piston Ring Expander
      G08233019Courtesy of NISSAN NORTH AMERICA, INC.
    • If there is stamped mark on ring, mount it with marked side up.

      Stamped mark: 

      Top ring (A): 1 N 

      Second ring (B): 2 N 

      Fig 11: Identifying Ring Installation Position
      G08233020Courtesy of NISSAN NORTH AMERICA, INC.
    • Position each ring with the gap as shown in the figure referring to the piston front mark (D).
      Fig 12: Identifying Rings Gap
      G08233021Courtesy of NISSAN NORTH AMERICA, INC.
    • Check the piston ring side clearance. Refer to "INSPECTION ".
  11. Install connecting rod bearings to connecting rod and connecting rod bearing cap.
    CAUTION: Be careful not to drop connecting rod bearing, and to scratch the surface.
    • Before installing connecting rod bearings, apply engine oil to the bearing surface (inside). Do not apply engine oil to the back surface, but thoroughly clean it.
    • When installing, align connecting rod bearing stopper protrusion (B) with cutout (C) of connecting rods and connecting rod bearing caps to install.
    • Ensure the oil hole (A) on connecting rod and that on the corresponding bearing are aligned.
      Fig 13: Identifying Connecting Rod Bearing Stopper Protrusion With Cutout And Oil Hole
      G08233022Courtesy of NISSAN NORTH AMERICA, INC.
  12. Install piston and connecting rod assembly to crankshaft.
    • Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.
    • Apply engine oil sufficiently to the cylinder bore, piston and crankshaft pin journal.
    • Match the cylinder position with the cylinder number on connecting rod to install.
    • Be sure that front mark on piston crown is facing the front of the engine.
    • Using a piston ring compressor [SST: EM03470000 (J-8037)] (A) or suitable tool, install piston with the front mark on the piston crown 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 14: Installing Piston Ring Using Piston Ring Compressor
      G08233023Courtesy of NISSAN NORTH AMERICA, INC.
  13. Install connecting rod bearing cap.
    • Match the stamped cylinder number marks on connecting rod with those on connecting rod bearing cap to install.
      Fig 15: Identifying Grades And Codes
      G08233024Courtesy of NISSAN NORTH AMERICA, INC.
    • Be sure that front mark (H) on connecting rod bearing cap is facing the front of the engine.
  14. Tighten connecting rod bolt as follows:
    1. Inspect the outer diameter of connecting rod bolt. Refer to "INSPECTION ".
    2. Apply engine oil to the threads and seats of connecting rod bolts.
    3. Tighten connecting rod bolts.

      Tightening Torque: 28.4 N.m (2.9 kg-m, 21 ft-lb) 

    4. Completely loosen connecting rod bolts.

      Tightening Torque: 0 N.m (0 kg-m, 0 ft-lb) 

    5. Tighten connecting rod bolts.

      Tightening Torque: 24.5 N.m (2.5 kg-m, 18 ft-lb) 

      Fig 16: Checking Connecting Rod Bolts Tightening Using Angle Wrench
      G08233025Courtesy of NISSAN NORTH AMERICA, INC.
    6. Then turn connecting rod bolts 90 degrees clockwise (angle tightening).
      CAUTION: Always use the angle wrench [SST: KV10112100 (BT8653-A)] (A). Never make judgment by visual inspection.
      • After tightening connecting rod bolts, check that crankshaft rotates smoothly.
      • Check the connecting rod side clearance. Refer to "INSPECTION ".
  15. Install baffle plate.
  16. Install new rear oil seal. Refer to "REAR OIL SEAL: REMOVAL AND INSTALLATION ".
    • Apply new engine oil to both oil seal lip and dust seal lip.
  17. Install pilot converter (A/T models) or pilot bushing (M/T models).
    • With a drift of the following outer diameter, press-fit as far as it will go.

      Pilot bushing: Approx. 17 mm (0.67 in) 

      Pilot converter: Approx. 33 mm (1.30 in) 

      Fig 17: Installing Pilot Bushing And Converter Using Drift
      G08233026Courtesy of NISSAN NORTH AMERICA, INC.
    • Press-fit pilot converter with its chamfer facing crankshaft as shown in the figure. (A/T models)
      Fig 18: Identifying Pilot Converter With Chamfer Facing
      G08233027Courtesy of NISSAN NORTH AMERICA, INC.
    • Press-fit pilot bushing (1) as the dimension shown in the figure. (M/T models)

      A: Crankshaft (rear end surface) 

      b: 10.20 - 10.85 mm (0.402 - 0.427 in) 

      [Target: 10.20 mm (0.402 in)] 

      Fig 19: Identifying Pilot Bushing And Crankshaft
      G08233028Courtesy of NISSAN NORTH AMERICA, INC.
  18. Install knock sensors.
    Fig 20: Identifying Knock Sensors
    G08233029Courtesy of NISSAN NORTH AMERICA, INC.
    • Install knock sensor so that connector faces the rear of the engine.
    • After installing knock sensor, connect harness connector, and lay it out to rear of the engine.
      CAUTION:
      • Never tighten mounting bolts while holding connector.
      • If any impact by dropping is applied to knock sensor, replace it with new one.
      NOTE:
      • 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.
  19. Note the following, assemble in the reverse order of disassembly after this step.

    Flywheel  (M/T models)

    • Ensure the dowel pin (1) is installed in the crankshaft.
      Fig 21: Identifying Flywheel, Crankshaft, Dowel Pin And Hole
      G08233030Courtesy of NISSAN NORTH AMERICA, INC.
    • When installing flywheel (3) to crankshaft (2), be sure to correctly align crankshaft side dowel pin and flywheel side dowel pin hole (A).
    • There is a matching mark (B) on the clutch cover side of flywheel (4). Refer it during installation.
      Fig 22: Identifying Flywheel, Oil Seal, Crankshaft, Dowel Pin And Hole
      G08233031Courtesy of NISSAN NORTH AMERICA, INC.

    Drive plate  (A/T models)

    • When installing drive plate to crankshaft, be sure to correctly align crankshaft side dowel pin and drive plate side dowel pin hole.
      CAUTION: If these are not aligned correctly, engine runs roughly and "MIL" illuminates.
    • Install drive plate (2) and reinforcement plate (3) as shown in the figure.
      Fig 23: Identifying Drive Plate And Reinforcement Plate
      G08233032Courtesy of NISSAN NORTH AMERICA, INC.
    • Holding ring gear with the ring gear stopper [SST: KV10118600 (J-48641)].
    • Tighten the mounting bolts crosswise over several times.
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