Air Intake 09 used if a vehicle is routinely exposed to rough road conditions or off-road applications. 1 7. Check the two band clamps that hold the air cleaner in place on the cowl. Ensure the canister has not slipped downwards. If this condition is present, loosen the two band clamp bolts and slide the canister upward until the outlet pipe is properly aligned with the opening in the cowl. 2 8. Inspect the alignment and fit of the rubber elbow that passes through the cowl and attaches the intake duct to the canister outlet pipe. Adjust as necessary to ensure a proper connection and tighten the clamps as follows:
clamps at rubber- to-plastic duct connections should be tightened 39 to 41 lbf·in (440 to 460 N·cm), and clamps at rubber-to-metal duct connections should be tight- ened 90 to 100 lbf·in (1015 to 1130 N·cm). Do not over-tighten the clamps. Frontwall-Mounted Air Cleaner, Non–4700 Models 3 4 5 07/18/2011 f090491 1. Mounting Bolt, Air Cleaner Element 2. Capscrew, Air Cleaner Housing 3. Clamp, Molded Duct to Air Cleaner 4. Clamp, Molded Duct to Elbow 5. Clamp, Elbow Duct to Turbo This style of air intake system has the air cleaner element mounted horizontally across the left side of the firewall.
The air intake is through ducting built into the hood and routed into the top of the air cleaner canister. See Fig. 4 . Fig. 2, Frontwall-Mounted Air Cleaner, 4700 Models 1. Check that the bolts on the canister mounting brackets are tight. 2. Check the mounting angle of the air cleaner can- ister inlet boot. It must be rotated forward slightly to ensure a correct seal to the hood intake duct. Inspect the hood and boot contact points for proper contact as evident by the polished area on the hood where the boot contacts it. 1 2 3. Check the connection points of the entire intake system to ensure the alignment of the rubber hoses to the charge air cooler pipe connections are correct.
Check the piping for evidence of movement at the joint connections. 4 5 7 3 4. Check the tightness and condition of the clamp- ing hardware. Clamps at rubber-to-plastic duct connections should be tightened 39 to 41 lbf·in (440 to 460 N·cm), and clamps at rubber-to- metal duct connections should be tightened 90 to 100 lbf·in (1015 to 1130 N·cm). Replace any clamps that are corroded or fail to operate smoothly when tightened. 08/22/2001 6 f090418 1. Rubber Elbow 2. Gear Clamp 3. Constant-Torque Clamp 4. Turbocharger 5. Plastic Pipe 6. Flex Hose 7. Air Cleaner Fig. 3, Air Intake, Cowl-Mounted Air Cleaner Western Star Maintenance Manual, January 2015 09/2