DPF Cleaning

Why is it Needed?

Diesel particulate filters trap soot from the exhaust and ash from motor oil. Most soot is burned off in the course of a truck's operations, but ash stays in the filter's honeycomb substrate and is removed through periodic servicing.

Exhaust in highway trucks is usually hot enough to burn off most soot in a process called "passive regeneration." However, those involved in stop-and-go operations or that idle a lot don't get their exhaust hot enough. The latter must "actively" burn out soot from the substrate by injecting extra fuel just upstream of an oxygen catalyst or by plugging in an electric heater when parked.

Sometimes an engine produces extra soot or spits out unburned fuel and burned motor oil. These, too, are captured by the DPF, and usually it can't burn them out through normal processes. So occasionally the substrate must be removed from the DPF, then heated and baked in a special machine to burn out the crud.

How is it Done?

Ash from motor oil stays in the filter's substrate and must be periodically blown or washed out. This is done by removing the DPF from the truck and placing it on a special machine. It sends compressed air through the substrate in a series of measured puffs. Filters are pressure-washed with de-ionized water, then dried.

Visit Rihm Kenworth today for your DPF cleaning needs