NOISE EMISSION CONTROL Diesel Particulate Filters (DPF) Engine Fan and Shroud Hood Insulation Blanket Check diesel particulate filter (DPF), clamps, and mounting brackets. Tighten if necessary. Inspect diesel particulate filter (DPF) for signs of rust or corrosion. WARNING! Check all fasteners for condition and security. Repair or replace any broken or defective fasteners. Do not work on the fan with the en- gine running. The engine fan can engage at any time without warning. Anyone near the fan when it turns on could be injured. Before turning on the ignition, be sure that no one is near the fan. Check for chafing or tears. Patch it if necessary. Find the cause of the damage.
If any component or accessory is causing wear or damage and cannot be relocated, put reinforcing pads on the blanket at the site of wear. Check internal baffling. You can do this by listening for rattling sounds while tapping on the diesel particulate filter (DPF) with a rubber mallet or revving the engine up and down through its normal operating range. Check all fasteners for tightness. Check for stress cracks in the shroud. Make sure the shroud is adjusted so that it does not touch the fan blades. 5 Check to verify that the fan is disengaged (not turning) with the engine running at normal operating temperatures (from cold to the point that the fan engages). Check fan blade mounting bolts.
Inspect fan blades to be sure they are not cracked or bent. (03/17) Y53-6077-1B1 5-127