GM Full Size Vans 1967-1986 Repair Guide

Air Cleaner

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REMOVAL & INSTALLATION



Paper Element Type

See Figures 1 through 5



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Fig. Fig. 1: Remove the air cleaner cover ...



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Fig. Fig. 2: ... then remove the air filter element



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Fig. Fig. 3: If equipped, remove the crankcase ventilation filter



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Fig. Fig. 4: View of a common six cylinder air cleaner assembly



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

Loosen the wing nut on top of the cover and remove the cover. The element should be replaced when it has become oil saturated or filled with dirt. If the filter is equipped with a foam wrapper, remove the wrapper and wash it in kerosene or similar solvent. Shake or blot dry. Saturate the wrapper in engine oil and squeeze it tightly in an absorbent towel to remove the excess oil.

Leave the wrapper moist. Clean the dirt from the filter by lightly tapping it against a workbench to dislodge the dirt particles. Wash the top of the air cleaner housing and wipe it dry. If equipped, replace the crankcase ventilation filter, located in the air filter housing if it appears excessively dirty. Replace the oiled wrapper on the air cleaner element and reinstall the element in the housing, repositioning it 180° from its original position.

Inverting the air cleaner cover for increased intake air volume is not recommended. This causes an increase in intake noise, faster dirt buildup in both the air cleaner element and the crankcase ventilation filter, and poor cold weather driveability.

Oil Bath Type

See Figures 6 and 7



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Fig. Fig. 6: Exploded view of an air cleaner element with a polyurethane wrap (optional starting in 1972)



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Fig. Fig. 7: Air flow in the oil bath air cleaner assembly (optional through 1971)

To service the optional (through 1971) oil bath type air cleaner, remove the wing nut at the top and remove the cover and element. Drain all of the oil from the reservoir. Clean all of the parts and dry thoroughly, but do not use compressed air on the element.

Reinstall the reservoir and fill to the mark with SAE 50 engine oil (above freezing) or SAE 20 engine oil (below freezing). Install the element in the reservoir and replace the cover and tighten the wing nut.

 
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