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DPF Cleaning

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NEW SERVICE AT OUR GRAND RAPIDS LOCATION!

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. 

Active removal of soot through on-board regeneration can occur one or more times a day, depending on its type of operation, manufacturers say. Often it goes unnoticed by the driver, who may or may not see the indicator light in the instrument panel. But sometimes a warning gets more insistent through the light indicators and the driver must stop and initiate an active regeneration. 

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. Detroit Diesel's filters are pressure-washed with de-ionized water, then dried. 

 

 

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. About 10% of filters brought in for servicing need this, manufacturers say.

Once a mechanic gets at a truck, it usually takes about 60 to 90 minutes to remove the DPF, set it on a machine, clean it for about a half hour, then reinstall the filter on the truck. If baking is required, it may take up to eight hours in the machine. The advantage is that the original DPF stays with the truck, which might add to resale value because its owner can show complete servicing records. 

An alternative is the owner removing the DPF and taking it, or a batch of them, to a servicing shop. Here the owner gets back his DPFs, even if he moves them among like-spec'd vehicles in the fleet. This requires him to keep a stock of new or cleaned DPFs to install when loaded up units are removed. An advantage is low downtime for individual vehicles. 

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