may2021 - 22

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TP-16-3SA

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Innovative solutions improve
aftertreatment maintenance
Even with adequate training, service tools, and
preventive maintenance measures, most fleets could
still benefit from additional aftertreatment system
assistance. Fortunately, there are many aftermarket
solutions that can help.
" Here at E+CS, we have a process known as the
DPFRENU process, " Griffith said. " This process is used
to service the DPF filters themselves and can increase
the longevity of an aftertreatment service. DPFRENU
can also reduce strain on the engine by decreasing
backpressure and creating more soot-loading capacity. "
As Griffith explained, good DPF cleaning programs
that focus on flow rate and capacity can help dramatically decrease the cost and downtime associated with
aftertreatment issues. Since there are many different
processes and types of equipment available, Griffith
said it is important for a fleet to partner with a good
service provider. That company can proactively maintain the fleet's aftertreatment systems, as opposed to
reactively deleting or removing systems that are not
functioning properly.
Detroit's Copeland said fleets should simply refer
to Detroit's guidelines on sourcing a remanufactured
filter rather than having it cleaned by a third party.
" Our remanufacturing process features an extensive,
proprietary, environmentally friendly washing service
for DPFs, " Copeland explained. " This cleaning process
removes more than 95 percent of the ash residue from
the DPF. Incorrectly removing the harmful ash residue
in the filter can create hot spots. That can lead to a
cracked DPF, downtime, and additional maintenance
costs. Our process is far more effective than using a
'bake and blow' method. "

Getting to the root of
upstream air leaks
TR-25

FOUR POST RUNWAY LIFTS

PARALLELOGRAM LIFTS

Redline Detection's Parker said certain product innovations can also help diesel technicians proactively
seek out air leaks, which happen to be the root cause
of many DPF-related issues.

»This Volvo Exhaust
Aftertreatment System (EATS)
features a one-box design that
encases the DPF, SCR system,
and DEF injector into one
package. This design reduces
weight while making the DPF
easier to access for servicing.
Photo courtesy of Volvo

VERTICAL RISE LIFTS
FleetMaintenance.com/Inquire

www.mohawklifts.com

1-800-833-2006

22 Fleet Maintenance | May 2021

Research from Redline Detection suggests that
an " upstream component fault " is the most common
cause (89 percent) of DPF failure. This can be caused
by small air leaks that are often undetectable. These
upstream leaks create an inconsistent air/fuel ratio
that can lead to downstream aftertreatment faults
and, ultimately, DPF/SCR failure.
According to analysis from Redline Detection, the
most problematic upstream component failures are:
* Leaking injectors
* Leaking exhaust pipes
* Manifold gaskets
* Coolant leaks
* EGR cooler leaks
* Doser valve (aka 7th injector)
* Turbo failure or housing failure
* Sensors and wiring harness failure
The challenge for fleets is identifying when and
where these seemingly undetectable upstream air
leaks exist before they result in a failed aftertreatment
system. As Parker pointed out, the old-school method
isn't effective.
" Standard practice has always been to pressurize a
system by starting the engine, slide under the running
truck, spray soapy water, and look for bubbles, " Parker
said. " That method is not only dangerous, but also
makes it nearly impossible to reach many of the key

" Incorrectly removing
the harmful ash residue
in the filter can create
hot spots. That can
lead to a cracked DPF,
downtime, and additional
maintenance costs. "
Len Copeland, product marketing
manager for Detroit Products

http://www.mohawklifts.com http://www.FleetMaintenance.com/Inquire

may2021

Table of Contents for the Digital Edition of may2021