I think I have seen one RW with this kit Pub Type: Bulletin Group Code: 233 Number: SB233017 Former Number: 14E025 Date: 04/13/1992 Model: RW EXCEPT WITH CUMMINS 475 ENGINE Title: HOOD SCOOP MODIFICATION Hood Scoop Modification (All RW Models Except With Cummins 475) To inform the field of a way to modify the air intake system for RW models in severe service applications, this modification improves air cleaner life. Remove all tubing and ducting on intake side of the air cleaner. Install 5MD1254 (90 degree elbow) on intake side of air cleaner, using the old clamps from the intake ducting. Loosen air cleaner mounting strap and move air cleaner assembly inboard as far as mounting straps will permit. Rotate the filter assembly until the elbow inlet is parallel with hood angle. Remove hood spring from mounting brackets on the radiator side. Remove bolts and rollers from brackets leaving spring attached to hood on the top side. Cross springs; left side spring to right side, right side to left. Fasten spring to holes in bracket where bolts were removed. This will provide clearance for hood scoop piping. Install sleeve (5MD3608M12) tube into elbow. You may cut the tube on the original intake ducting to the required length and use it instead of a new tube. Use old clamps to secure. Apply a bead of white lubriplate to the lip of the tube. Close the hood so the lubriplate will mark the location for the hole. Find center of marking left by lubriplate on hood. Drill a pilot hole and scribe a 8 inch diameter circle. Cut and remove. Use hood scoop (139QM58) for a template for wear surface plate. Drill mounting hole from hood scoop through plate. Center hood scoop between both hood lines. The rear of scoop should be about 14 - 1/2 inches ahead of rear edge of hood. Mark holes for mounting. Drill four 1/4 inch holes. Attach aluminum plate with bolts to hood and using hood as a template, mark plate. Cut out an eight inch circle. Using 4, 1/4 inch x 1 inch bolts with locking nuts (8 flat washers, 2 per bolt), attach hood scoop and aluminum wear plate to hood, (wear plate inside hood). If you hood scoop does not have a deflector screen in the opening, one can be purchased as part number 8MG418. With the scoop and piping in place, slide boot 56MD 48M over tube down to elbow. Fasten with clamp. This is a seal to keep the under hood heat from entering air cleaner piping. Close hood and check for proper sealing and fit. The following is a list of parts required: 56MD48M Boot 5MD1254 Elbow 5MD3608M12 Tube 139QM58 Scoop Assembly 8MG418 Deflector RW Series Hoop Scoop Arrangement (Driver's Side View) In order to view this image an SVG Viewer must be installed onto your computer. 1. Hood Scoop - 139 QM58 2. Aluminum Plate 3. Air Cleaner Housing 4. Elbow - 5MD 1254 5. Aluminum tube 5MD 3608 M 12 6. Boot 56MD48M © Copyright 2006 Mack Trucks, Inc. All rights reserved. Terms of Use