Nissan Pick-ups and Pathfinder 1970-1988

Rear Main Oil Seal

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REPLACEMENT



See Figures 1, 2, 3, 4, 5 and 6

All 4 Cylinder Gasoline Engines

In order to replace the rear main oil seal, the rear main bearing cap must be removed. Removal of the rear main bearing cap requires the use of a special rear main bearing cap puller. Also, the oil seal is installed with a special crankshaft rear oil seal drift. Unless these or similar tools are available to you, it is recommended that the oil seal be replaced by a Nissan/Datsun service center or an independent shop that has the proper equipment.

  1. Remove the engine and transmission assembly from the vehicle.
  2.  
  3. Remove the transmission from the engine. Remove the oil pan.
  4.  
  5. Remove the clutch from the flywheel.
  6.  
  7. Remove the flywheel from the crankshaft.
  8.  
  9. Remove the rear main bearing cap together with the bearing cap side seals.
  10.  
  11. Remove the rear main oil seal from around the crankshaft.
  12.  

To install:
  1. Apply lithium grease around the sealing lip of the oil seal and install the seal around the crankshaft using a suitable tool.
  2.  
  3. Apply sealer to the rear main bearing cap as indicated in the accompanying illustration, install the rear main bearing cap, and tighten the cap bolts to 33-40 ft. lbs. (44-54 Nm)
  4.  
  5. Apply sealant to the rear main bearing cap side seals and install the side seals, driving them into place with a suitable drift.
  6.  
  7. Install the oil pan with a new gasket.
  8.  
  9. Install the flywheel and clutch assembly.
  10.  
  11. Install the transmission to the engine, then install the engine/transmission assembly in the vehicle. Refer to the Engine Removal and Installation procedure.
  12.  
  13. Check all fluid levels, start the engine and check for any leaks. Roadtest the vehicle for proper operation.
  14.  

SD22, SD25 and VG30i Engines
  1. Refer to the Engine, Removal and Installation procedures, in this section and remove the engine/transmission from the vehicle.
  2.  
  3. Separate the transmission from the engine.
  4.  
  5. Remove the clutch assembly from the flywheel (MT) or the torque converter from the drive plate (AT).
  6.  
  7. Remove the flywheel or the drive plate from the crankshaft, then secure the engine to a workstand.
  8.  
  9. If not already done, drain the oil from the crankcase, then remove the oil pan.
  10.  
  11. Remove the rear oil seal retainer from the rear of the engine.
  12.  
  13. Using a medium pry bar (or even a pair of pliers), pry the oil seal from the seal retainer.
  14.  

To install:
  1. Using a putty knife, clean the gasket mounting surfaces.
  2.  
  3. Apply oil to the sealing lip and the mounting surface of the new oil seal, then press the seal into the oil seal retainer. Install the oil seal retainer/seal around the crankshaft.
  4.  
  5. To complete the installation, use new gaskets and reverse the removal procedures. Refill the crankcase and the cooling system; if equipped with an automatic transmission, check the fluid.
  6.  



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Fig. Fig. 1: Removing the rear main bearing cap



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Fig. Fig. 2: Removing the rear main seal retainer-SD22 and SD25 engines



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Fig. Fig. 3: Removing the rear main seal retainer-all 4-cylinder gasoline engines



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Fig. Fig. 4: Installing the rear main seal



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Fig. Fig. 5: Application of sealer to rear main bearing cap



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Fig. Fig. 6: Removing the rear main seal-VG30i, SD22 and SD25 engines

 
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