Inspection of the Air Cleaner
Restriction of air flow through the air cleaner element is measured at the tap in the air cleaner outlet. Check the restriction indicator at the air cleaner or in the cab if the vehicle is equipped with a dash-mounted restriction gauge.
Vehicles may be equipped with either a manual-reset restriction indicator with graduations (see Fig.), or a go/no-go restriction indicator without graduations (see Fig.).
Fig. 1, Manual-Reset Air Restriction Indicator, Graduated
Fig. 2, Manual-Reset Air Restriction Indicator, Go/No-Go
- Inspect the air restriction indicator to see if air restriction equals or exceeds the maximum allowable restriction. For instructions, see of the Cascadia Workshop Manual.
- If necessary, replace the air cleaner element. For air cleaner element replacement instructions, see of the Cascadia Workshop Manual.
- Inspect the air cleaner housing for cracks, leaks, or any other damage. If the air cleaner housing or element is damaged, replace it.
- Inspect the forward and rear mounting isolators for damage.
See Fig.. Ensure the bonds between the rubber and the steel plates
are completely intact. See Fig..If a mounting isolator is damaged, replace it. For isolator replacement instructions, see of the Cascadia Workshop Manual.
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Air Cleaner Housing
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Nut
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Forward Mounting Isolator
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Aft Mounting Isolator
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Aft Mounting Bracket
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Clamp
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Intake Duct
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Clamp
Fig. 3, Air Cleaner Assembly
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Steel Plate
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Rubber
Fig. 4, Mounting Isolator
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- Remove the pre-cleaners (if so equipped) from the hood plenum, then clean them with compressed air.
- Reset the air restriction indicator.
- Each time the air cleaner housing is replaced, perform the procedures in Inspection of the Air Compressor.
Notice: Do not use aftermarket air-cleaner elements. Aftermarket air-cleaner elements may not seal the housing correctly, which can lead to engine damage and potentially the loss of warranty. When replacing an air-cleaner element, use only the part listed in PartsPro for the serial number of the vehicle.