REMOVAL & INSTALLATION
See Figures 1 through 6
The element should be replaced at the recommended intervals shown in the Maintenance Intervals charts later in this section. 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 good times for an 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.
- Disconnect all hoses, ducts and vacuum tubes from the air cleaner assembly.
- On 1989 VG30i models and all 4 cylinder models, remove the two (2) top cover wing nuts and grommet (if so equipped). Most models also utilize four side clips (five on the VG30i) to further secure the top of the assembly. Simply pull the wire tab and release the clip. On the 1990 and later VG30E engine, air cleaners are secured solely by means of clips (air box-to-cleaner housing). Remove the cover and lift out the filter element.
- Remove any side mount brackets and/or retaining bolts, then lift off the air cleaner assembly.
- 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 if it appears worn or broken.
- Reposition the air cleaner assembly, then install the mounting bracket and/or bolts.
- 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.
Filter elements on many engines have a TOP and BOTTOM side; be sure they are inserted correctly.
- Reconnect all hoses, ductwork and vacuum lines.
Never operate the engine without the air filter element in place.
See Figures 7 through 11
The air cleaner element can be replaced by removing the wingnut(s) and/or side clips, then removing the top cover as previously detailed.
See Figure 12Z24i, VG30i AND KA24E ENGINES
Certain models may also utilize an air cleaner-mounted crankcase ventilation filter. If so, it should also be cleaned or replaced at the same time as the regular air 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 need replacement, remove the clip mounting the feeder tube to the cleaner housing, then remove the assembly from the air cleaner.