Mazda Trucks 1987-1993 Repair Guide

Rear Main Oil Seal

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REPLACEMENT



2.2L and 2.6L (1989-93) Engines
  1. Disconnect the negative battery cable. Raise and support the vehicle safely. Remove the transmission.
  2.  
  3. If equipped with a manual transmission, remove the pressure plate, the clutch disc and the flywheel. If equipped with an automatic transmission, remove the drive plate from the crankshaft.
  4.  
  5. Remove the rear oil pan-to-seal housing bolts.
  6.  
  7. Remove the rear main seal housing bolts and the housing from the engine.
  8.  
  9. Remove the oil seal from the rear main housing.
  10.  
  11. Clean the gasket mounting surfaces.
  12.  
  13. To install, use a new seal, coat the seal and the housing with oil. Drive the seal into the housing, using a seal driver.
  14.  
  15. To complete the installation, use new gaskets, apply sealant to the oil pan mounting surface and reverse the removal procedure. Torque the rear seal housing to 6-8 ft. lbs. (8-11 Nm) on the 2.2L engine and 95 in. lbs. (11 Nm) on the 2.6L engine.
  16.  

2.6L Engine (1987-88)

The rear main seal is located in a housing on the rear of the block. To replace the seal, it is necessary to remove the transmission and perform the work from underneath the truck or remove the engine and perform the work on an engine stand or work bench.

  1. Unscrew the retaining bolts and remove the housing from the block.
  2.  
  3. Remove the separator from the housing.
  4.  
  5. Using a small pry bar, pry out the old seal.
  6.  
  7. Clean the housing and the separator.
  8.  
  9. Lightly oil the replacement seal. Tap the seal into housing using a canister top or other circular piece of metal. The oil seal should be installed so that the seal plate fits into the inner contact surface of the seal case.
  10.  
  11. Install the separator into the housing so that the oil hole faces down.
  12.  
  13. Oil the lips of the seal and install the housing on the rear of the engine block.
  14.  

3.0L Engine

  1. Raise and support the vehicle safely. Remove the transmission from the vehicle.
  2.  
  3. If equipped with manual transmission, remove the clutch pressure plate and flywheel.
  4.  
  5. If equipped with automatic transmission, remove the flywheel assembly.
  6.  
  7. Drain the engine oil. Remove the engine oil pan.
  8.  
  9. Remove the rear main seal cover retaining bolts. Remove the rear main seal cover. Remove the seal from the rear cover.
  10.  
  11. Installation is the reverse of the removal procedure. Apply clean engine oil to the seal before pressing it into the cover.
  12.  
  13. After installing the rear cover cut away the portion of the gasket that projects out toward the oil pan side.
  14.  

4.0L Engine

See Figures 1 and 2

If the crankshaft rear oil seal replacement is the only operation being performed, it can be done in the vehicle as detailed in the following procedure. If the oil seal is being replaced in conjunction with a rear main bearing replacement, the engine must be removed from the vehicle and installed on a work stand.

  1. Remove the starter.
  2.  
  3. Remove the transmission from the vehicle, following the procedures in Chapter 7.
  4.  
  5. On a manual shift transmission, remove the pressure plate and cover assembly and the clutch disc following the procedure in Chapter 7.
  6.  
  7. Remove the flywheel attaching bolts and remove the flywheel and engine rear cover plate.
  8.  
  9. Use an awl to punch two holes in the crankshaft rear oil seal. Punch the holes on opposite sides of the crankshaft and just above the bearing cap to cylinder block split line. Install a sheet metal screw in each hole. Use two large screwdrivers or small pry bars and pry against both screws at the same time to remove the crankshaft rear oil seal. It may be necessary to place small blocks of wood against the cylinder block to provide a fulcrum point for the pry bars. Use caution throughout this procedure to avoid scratching or otherwise damaging the crankshaft oil seal surface.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Remove the rear seal using a small prying tool



Click image to see an enlarged view

Fig. Fig. 2: Using a seal driver tool to install the rear main oil seal

To install:
  1. Clean the oil seal recess in the cylinder block and main bearing cap.
  2.  
  3. Clean, inspect and polish the rear oil seal rubbing surface on the crankshaft. Coat a new oil seal and the crankshaft with a light film of engine oil. Start the seal in the recess with the seal lip facing forward and install it with a seal driver. Keep the tool, T72C-6165, straight with the centerline of the crankshaft and install the seal until the tool contacts the cylinder block surface. Remove the tool and inspect the seal to be sure it was not damaged during installation.
  4.  
  5. Install the engine rear cover plate. Position the flywheel on the crankshaft flange. Coat the threads of the flywheel attaching bolts with oil-resistant sealer and install the bolts. Tighten the bolts in sequence across from each other to the specifications listed in the Torque chart at the beginning of this Chapter.
  6.  
  7. On a manual shift transmission, install the clutch disc and the pressure plate assembly following the procedure in Chapter 7.
  8.  
  9. Install the transmission, following the procedure in Chapter 7.
  10.  

 
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