Disassembly and Assembly: Disassembly

WARNING: This page is about a different car, the 2012 Infiniti G25. However, it is still accessible from the selected car via links, so may be relevant.

Remove the following parts:
- Oil pans (lower and upper): Refer to "2WD: EXPLODED VIEW " (2WD models) or "AWD: EXPLODED VIEW " (AWD models).
- Timing chain: Refer to "EXPLODED VIEW ".
- Rear timing chain case. Refer to "EXPLODED VIEW ".
- Cylinder head: Refer to "EXPLODED VIEW ".
Remove knock sensor.
CAUTION: Carefully handle sensor avoiding shocks.
Remove baffle plate from lower cylinder block.
Remove piston and connecting rod assembly with the following procedure:
- Before removing piston and connecting rod assembly, check the connecting rod side clearance.
CAUTION: Never drop connecting rod bearing, and to scratch the surface.
1. Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.
2. Remove connecting rod bearing cap.
3. Using a hammer handle or similar tool, push piston and connecting rod assembly out to the cylinder head side.
  CAUTION: Never damage the cylinder wall and crankshaft pin, resulting from an interference of the connecting rod big end.
  
  Fig 1: Pushing Piston And Connecting Rod Assembly Using Hammer Handle
  Courtesy of NISSAN NORTH AMERICA, INC.
Remove connecting rod bearings from connecting rod and connecting rod bearing cap.
CAUTION:
- Never drop connecting rod bearing, and to scratch the surface.
- Identify installation positions, and store them without mixing them up.
Remove piston rings from piston.
- Before removing piston rings, check the piston ring side clearance. Refer to "CYLINDER BLOCK ".
- Use a piston ring expander (commercial service tool) (A).
CAUTION:
- When removing piston rings, be careful not to damage piston.
- Never damage piston rings by expanding them excessively.
Fig 2: Removing Piston Rings From Piston Using Piston Ring Expander
Courtesy of NISSAN NORTH AMERICA, INC.
Remove piston from connecting rod as follows:
1. Using a snap ring pliers (A), remove snap rings.
  
  Fig 3: Removing Piston From Connecting Rod Using Snap Ring Pliers
  Courtesy of NISSAN NORTH AMERICA, INC.
2. Heat piston to 60 to 70°C (140 to 158°F) with an industrial use drier (A) or equivalent.
  
  Fig 4: Heating Piston Using Drier
  Courtesy of NISSAN NORTH AMERICA, INC.
3. Push out piston pin with stick of outer diameter approximately 20 mm (0.79 in).
  
  Fig 5: Pushing Out Piston Pin Using Stick
  Courtesy of NISSAN NORTH AMERICA, INC.
Remove main bearing cap bolts.
NOTE: Use TORX socket (size E14).
- Before loosening main bearing cap bolts, measure the crankshaft end play. Refer to "INSPECTION ".
- Loosen main bearing cap bolts in the reverse order shown in the figure in several different steps.
  
  Fig 6: Identifying Tightening Sequence Of Main Bearing Cap Bolts
  Courtesy of NISSAN NORTH AMERICA, INC.
Remove main bearing beam.
Remove main bearing caps.
CAUTION: Never drop main bearing, and to scratch the surface.
- Using main bearing cap bolts, remove main bearing cap while shaking it back-and-forth.
  
  Fig 7: Removing Main Bearing Cap Bolts
  Courtesy of NISSAN NORTH AMERICA, INC.
Remove crankshaft.
Pull rear oil seal out from rear end of crankshaft.
Remove main bearings and thrust bearings from cylinder block and lower cylinder block.
CAUTION:
- Never drop main bearing, and to scratch the surface.
- Identify installation positions, and store them without mixing them up.