Nissan Pick-ups and Pathfinder 1970-1988

Air Cleaner

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REMOVAL & INSTALLATION



The element should be replaced at the recommended intervals shown in the Maintenance Intervals charts. If your truck is operated under severely dusty conditions or severe operating conditions, more frequent changes will certainly be necessary. Inspect the element at least twice a year. Early spring and early fall are always good times for inspection. Remove the element and check for any perforations or tears in the filter. Check the cleaner housing for signs of dirt or dust that may have leaked through the filter element or in through the snorkel tube. Position a droplight on one side of the element and look through the filter at the light. If no glow of light can be seen through the element material, replace the filter. If holes in the filter element are apparent or signs of dirt seepage through the filter are evident, replace the filter.

Air Cleaner Assembly (Housing)

See Figures 1, 2 and 3

  1. Disconnect all hoses, ducts and vacuum tubes from the air cleaner assembly.
  2.  
  3. Remove the top cover wing nut (two on later models) and grommet (if equipped). Most models will also utilize three or four side clips to further secure the top of the assembly, simply pull the wire tab and release the clip; in fact air cleaners on a few engines are secured solely by means of clips (air box-to-cleaner housing). Remove the cover and lift out the filter element.
  4.  
  5. Remove any side mount brackets and/or retaining bolts and lift off the air cleaner assembly.
  6.  

To install:
  1. Clean or replace the filter element as detailed previously. Wipe clean all surfaces of the air cleaner housing and cover. Check the condition of the mounting gasket and replace it if it appears worn or broken.
  2.  
  3. Reposition the air cleaner assembly and install the mounting bracket and/or bolts.
  4.  
  5. Reposition the filter element in the case and install the cover being careful not to overtighten the wingnut(s). On round-style cleaners, be certain that the arrows on the cover lid and the snorkel match up properly.
  6.  

Filter elements on many engines have a TOP and BOTTOM side, be sure they are inserted correctly.

  1. Reconnect all hoses, ductwork and vacuum lines.
  2.  

Never operate the engine without the air filter element in place.



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Fig. Fig. 1: Sometimes the air filter can be cleaned with low pressure compressed air



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Fig. Fig. 2: Air cleaner element and housing assembly



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Fig. Fig. 3: Many air cleaner assemblies have arrows on the housing and lid-always make sure they align

Air Cleaner Element

See Figures 4 through 10

The element can, in most cases be replaced by removing the wingnut(s) and side clips as already detailed.

On the SD22 engine, the filter element is removed with the air cleaner housing lid. Remove the wing nut at the bottom of the element and disconnect it from the lid.



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Fig. Fig. 4: Air filter element-SD22 engine



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Fig. Fig. 5: View of a common air cleaner assembly



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Fig. Fig. 6: Use a ratchet wrench to loosen the top nut on the air cleaner lid



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Fig. Fig. 7: Release the side clamp on the air cleaner assembly



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Fig. Fig. 8: Lift the air cleaner element from the housing



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Fig. Fig. 9: Removing the crankcase filter, if so equipped



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Fig. Fig. 10: During installation, make sure the air filter is correctly positioned

Crankcase Ventilation Filter

See Figure 11

Certain models may also utilize a cleaner-mounted crankcase ventilation filter, if so, it should also be cleaned or replaced at the same time as the regular filter element. To replace the filter, remove the air cleaner top cover and pull the filter from its housing on the side of the cleaner assembly. Push a new filter into the housing and reinstall the cover. If the filter and plastic holder are in need of replacement, remove the clip mounting the feeder tube to the cleaner housing and then remove the assembly from the air cleaner.



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Fig. Fig. 11: Crankcase ventilation filter

Air Induction/Injection Valve Filter
1981-86 CARBURETED ENGINES

See Figure 12

These models utilize an additional filter in the air cleaner housing and it is easily replaced. Unscrew the mounting bolts and remove the valve filter case. Pull the valve out and remove the filter that lies underneath it. Install the new filter and then the valve. Pay particular attention to which way the valve is facing so that the exhaust gases will not flow backward through the system. Install the valve case.



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Fig. Fig. 12: Air induction/injector valve filter-1981-86 carbureted models

 
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