Isuzu Cars and Trucks 1981-1991

Front Oil Seal

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REMOVAL AND INSTALLATION
Gasoline Engine
  1. Disconnect the negative battery cable. Remove the crankshaft pulley.
  2.  
  3. Remove the upper and lower timing belt covers.
  4.  
  5. Rotate the crankshaft to align the camshaft sprocket with the mark on the rear timing cover and the crankshaft sprocket keyway with the mark on the oil seal retainer cover.
  6.  


NOTE
With the timing marks aligned, the engine is positioned on the TDC of the No. 4 cylinder's compression stroke.

  1. Loosen the timing belt tensioner and relax the tension and remove the timing belt from the crankshaft sprocket.
  2.  
  3. Remove the crankshaft sprocket bolt, the sprocket, the key and deflector shield.
  4.  
  5. Using a small pry bar, pry the oil seal from the oil seal retainer.
  6.  

To install:

  1. Using a new oil seal, lubricate it with engine oil and tap it into the retainer with an oil seal installation tool.
  2.  
  3. Install the deflector, the key, the crankshaft sprocket and bolt.
  4.  
  5. With the crankshaft sprocket aligned with the timing mark, install the timing belt.
  6.  
  7. Apply the tensioner pulley spring pressure to the timing belt.
  8.  
  9. Rotate the crankshaft 2 complete revolutions in the opposite direction of rotation and realign the timing marks.
  10.  
  11. Loosen the tensioner pulley bolt to allow the spring to adjust the correct tension. Torque the tensioner pulley bolt to 14 ft. lbs. (20 Nm).
  12.  
  13. Install the timing covers and the crankshaft pulley.
  14.  
  15. To complete the installation, reverse the removal procedures.
  16.  

Diesel Engines
  1. Disconnect the negative battery terminal. Drain the cooling system.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the timing belt.
  2.  
  3. Remove the crankshaft sprocket bolt.
  4.  


NOTE
To remove the crankshaft sprocket bolt, it may be necessary to remove the starter or the flywheel cover plate to lock the flywheel; otherwise, it may be difficult to keep the crankshaft from turning.

  1. Using a puller tool press the crankshaft center and timing sprocket from the crankshaft.
  2.  
  3. Remove the oil seal retainer-to-rear timing cover bolts and the retainer.
  4.  
  5. Using a small pry bar, pry the oil seal from engine housing; be careful not to damage the crankshaft or the oil seal mounting surface.
  6.  

To install:

  1. Using a new oil seal, lubricate the seal lips with engine oil and install it into the engine using a seal installation tool.
  2.  
  3. Install the oil seal retainer.
  4.  
  5. Install the crankshaft center and timing sprocket to the crankshaft.
  6.  
  7. Install the timing belt.
  8.  
  9. Refill the cooling system. Start the engine, check and/or adjust the timing and check for leaks.
  10.  

 
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