Photo 1. The DPF selected was the 180-lb, DPX Catalytic Soot Filter, designed by Engelhard and built by Fleetguard.
Illustration 1. A DPF forces exhaust gas through semiporous material, where soot is trapped.
Photo 2. As the DPF-retrofitted vehicle operates, a catalyst and exhaust heat burn the particulates into a fine ash.
Photos 3 & 4. To ensure engine protection, de-rate devices – both in-dash and add-on – were used to alert drivers and reduce power output when backpressure exceeded a predetermined threshold.
Photos 3 & 4. To ensure engine protection, de-rate devices – both in-dash and add-on – were used to alert drivers and reduce power output when backpressure exceeded a predetermined threshold.
Photo 5. DPF internal substrate laden with ash before cleaning.
Photo 6. Cleaning starts with donning latex gloves and respirators, and loosening clamps and brackets.
