Chevrolet Full-size Cars 1968-1978 Repair Guide

Air Cleaner

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Underhood Maintenance Component Locations - 1977 Caprice With 305 CU. IN. Engine



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Fig. Fig. 2 To check or change the air filter, remove the wingnut ...



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Fig. Fig. 3 ... lift off the air cleaner lid ...



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Fig. Fig. 4 ... and remove the air filter



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Fig. Fig. 5 To replace the breather filter, remove the clip ...



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Fig. Fig. 6 ... and pull the breather free of the hose and air cleaner housing

The air cleaner has a dual purpose. It not only filters the air going to the carburetor, but also acts as a flame arrester if the engine should backfire through the carburetor. If an engine maintenance procedure requires the temporary removal of the air cleaner, remove it; otherwise, never run the engine without it. Operating a car without its air cleaner results in some throaty sounds from the carburetor giving the impression of increased power but will only cause trouble. Unfiltered air to the carburetor will eventually result in a dirty, inefficient carburetor and engine. A dirty carburetor increases the chances of carburetor backfire and, without the protection of an air cleaner, fire becomes a probable danger. The air cleaner assembly consists of the air cleaner itself, which is the large metal container that fits over the carburetor, the element (paper or polyurethane) contained within, and the flame arrester located in the base of the air cleaner. If your car is equipped with the paper element, it should be inspected at its first 12,000 miles, rechecked every 6,000 miles thereafter, and replaced after 24,000 miles. The 1975 and later air cleaners should be replaced at 30,000 mile intervals if the paper type (V8), and 15,000 miles if the oil wetted type (inline six). Inspections and replacements should be more frequent if the car is operated in a dirty, dusty environment. When inspecting the element, look for dust leaks, holes or an overly dirty appearance. If the element is excessively dirty, it may cause a reduction in clean air intake. If air has trouble getting through a dirty element, the carburetor fuel mixture will become richer (more gas, less air), the idle will be rougher, and the exhaust smoke will be noticeably black. To check the effectiveness of your paper element, remove the air cleaner assembly and, if the idle increases, then the element is restricting air flow and should be replaced. If a polyurethane element is installed, clean or replace it every 12,000 miles. If you choose to clean it, do so with kerosene or another suitable solvent. Squeeze out all of the solvent, soak in engine oil, and then squeeze out the oil using a clean, dry cloth to remove the excess. The flame arrester, located at the base of the carburetor, should be cleaned in solvent (kerosene) once every 12,000 miles.

 
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