Inspection and Replacement of the Air Cleaner
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.
Important: When first purchased, if the Recreational Vehicle is older than the current model year, replace the air filter.
Due to the variety of possible driving conditions (dirt roads, paved roads, etc.), it is critical to check the air restriction indicator, if so equipped. If the vehicle is not equipped with an air restriction indicator, inspect all components of the air intake system and air filter every 12 months. Replace the air filter every 24 months, or when filter restriction equals or exceeds the maximum allowable restriction. More frequent inspections and/or filter replacement may be needed if your vehicle is being operated in a dusty environment, to avoid damaging the vehicle.
Note: Remove and visually inspect the air filter for obvious damage such as holes, cuts, or dents. Remove loose debris, such as leaves or pine needles, from the filter housing.
Inspect the air cleaner and plumbing for holes or tears at the recommended interval. If the air cleaner is damaged, replace it. See of the Recreational Vehicle Chassis Workshop Manual for removal and installation procedures, or take the vehicle to an authorized Freightliner dealer. A typical air cleaner mounting is shown in Fig..
Fig. 1, Air Cleaner Mounting
Engine damage can occur if the air intake system is not properly maintained. Use the air intake restriction indicator to check for air intake system damage or leaks. See Fig.. Make sure the engine is off and note the existing reading on the indicator. Reset the indicator by pushing it down. See Fig.. Start the engine and take a short test drive. Check the indicator again and note the level of restriction on the indicator, verifying it is at the same level as seen earlier. A decrease from the previous level of restriction or a very low air restriction indicator reading (0 to 4 inH2O) could indicate an air intake system problem such as a damaged air filter, loose or disconnected air intake piping, or a disconnected or damaged air restriction indicator.
Fig. 2, Air Restriction Indicator
Replace the air filter at the recommended interval, or when filter restriction equals or exceeds the maximum allowable restriction. See the Recreational Vehicle Chassis Operator's Manual for specific restriction values for your engine. See of the Recreational Vehicle Chassis Workshop Manual for removal and installation procedures, or take the vehicle to an authorized Freightliner dealer.