Nissan Z - ZX 1970-1988 Repair Guide

Timing Belt/Chain Cover and Seal

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REMOVAL & INSTALLATION



Except VG Engines

See Figures 1 and 2

The VG engine is equipped with a timing belt instead of a timing chain.

  1. Disconnect the negative battery cable and drain the coolant. Remove the radiator hoses, the automatic transmission cooler lines (if equipped), the radiator and the shroud.
  2.  


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze, and could 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. If equipped with power steering, unbolt the pump and move it aside. DO NOT disconnect any of the hoses. Remove the pump mounting bracket from the engine. Remove the idler adjusting bracket from the engine.
  2.  
  3. If equipped with an air pump, remove the pump and bracket.
  4.  



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Fig. Fig. 1: Remove the crankshaft pulley using a suitable puller



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Fig. Fig. 2: When installing the timing cover, apply sealant to the highlighted sections

  1. If equipped with air conditioning, remove the idler pulley bracket and the belt. Unbolt the two lower compressor mounting bolts and support the compressor, then remove the two upper bolts and the mounting bracket.
  2.  

Support the compressor in such a way that stress will not be placed on the hoses. DO NOT disconnect any of the compressor hoses or lines.

  1. Remove the distributor.
  2.  
  3. Remove the oil pump attaching bolts, the pump and its drive spindle. Refer to the Engine Lubrication portion of this section for details.
  4.  
  5. Remove the engine cooling fan and the pulley, together with the drive belt, then remove the water pump.
  6.  
  7. Remove the crankshaft pulley bolt and the pulley, lock-up the engine to do this. The best way is to remove the flywheel inspection cover between the engine and transmission, then lock the flywheel with a tool made for the purpose. These are available in auto parts stores.
  8.  
  9. Remove the front cover-to-cylinder block bolts, the four bolts retaining the oil pan to the front cover and the two bolts screwed down through the front of the cylinder head into the top of the front cover.
  10.  
  11. Carefully pry the front cover off the engine.
  12.  
  13. Cut the exposed front section of the oil pan gasket away from the oil pan. Do the same to the gasket at the top of the front cover. Remove the two side gaskets and clean all the mating surfaces thoroughly.
  14.  
  15. Cut the portions needed from a new oil pan gasket and top front cover gasket.
  16.  
  17. Apply sealant to all of the gaskets and position them on the engine in their proper places.
  18.  
  19. To replace the oil seal, perform the following:
    1. Using a pointed piece of plastic or wood, pry the old seal from the cover. DO NOT use a screwdriver or other metal tools, which will damage the sealing lip.
    2.  
    3. Oil the lip of the new seal; DO NOT use grease. Press the seal into place, making sure the flat side faces forward and the lip faces the front of the engine. Use a seal driver made for the purpose (if possible) or a socket of the proper diameter.
    4.  
    5. Oil the crankshaft and the newly installed seal, then install the front cover.
    6.  

  20.  
  21. Carefully mount the front cover to the engine. Install the mounting bolts and tighten the bolts to 7-12 ft. lbs. (9-16 Nm) for 8mm bolts or to 3-6 ft. lbs. (4-8 Nm) for 6mm bolts and the oil pan bolts to 4-7 ft. lbs. (5-9 Nm).
  22.  
  23. Before installing the oil pump, place the gasket over the shaft and make sure that the mark on the drive spindle faces (aligns with) the oil pump hole. Install the oil pump so that the projection on the top of the shaft is located in the exact position as when it was removed or is in the 11 o'clock position with the piston in the No. 1 cylinder placed at TDC on the compression stroke (if the engine was disturbed). This will ensure proper distributor timing. Tighten the oil pump bolts to 8-10 ft. lbs. (10-13 Nm).
  24.  

For further information on the oil pump, refer to the Oil Pump removal and installation procedures in this section.

  1. To complete the installation, reverse the removal procedures.
  2.  

VG Engines

See Figures 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12

The front oil seal is a part of the oil pump assembly. To replace the oil pump seal, refer to the Oil Pump removal and installation procedures in this section, and replace the oil seal.

  1. Remove the radiator shroud, the fan and the pulleys.
  2.  
  3. Drain the coolant from the radiator and remove the water pump hose.
  4.  



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Fig. Fig. 3: Remove the retaining bolts securing the radiator shroud in place



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Fig. Fig. 4: Remove the nuts securing the fan blade to the clutch and water pump pulley



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Fig. Fig. 5: Lift the fan shroud and blade out together



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Fig. Fig. 6: Remove the bolts securing the upper pulley bracket



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Fig. Fig. 7: Remove the bracket and pulley



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Fig. Fig. 8: Loosen the crankshaft pulley bolt



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Fig. Fig. 9: Remove the bolt from the pulley ...



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Fig. Fig. 10: ... then withdraw the pulley from the crankshaft



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Fig. Fig. 11: A convex washer is installed between the crankshaft pulley and the timing belt pulley



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Fig. Fig. 12: Use a torque wrench to tighten the crankshaft pulley bolt


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze, and could 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 power steering, compressor and alternator drive belts.
  2.  
  3. Remove the front upper and lower belt covers.
  4.  
  5. To install, reverse the removal procedures.
  6.  

 
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