Total Solutions Flyer Canada_Web - Flipbook - Page 4
STRONGER
PERFORMANCE STARTS
WITH A HEALTHY
AFTERTREATMENT
SYSTEM
Your truck’s aftertreatment system is
essential for controlling emissions and
maintaining performance. Understanding
how each component works is key to
preventing costly downtime and repairs.
When you need reliable replacement parts,
Rush Truck Centres offers a comprehensive
inventory to keep you on the road. The
following information on aftertreatment
system maintenance and performance is
provided in partnership with Roadwarrior.
DIESEL PARTICULATE FILTER (DPF)
FAILURES
•
The DPF traps soot, which is burned off during
regeneration. Failures are often symptoms of
upstream problems, such as a compromised
DOC or engine issues.
Key Causes:
• Contaminated or poor-quality DEF
• Low exhaust temperatures from short trips
• Outdated software calibrations
Common Failures:
• Melted or cracked substrate from overheating
• Face plugging from excessive soot
• High ash accumulation
DIESEL OXIDATION CATALYST (DOC)
PERFORMANCE
Key Causes:
• A failed DOC leading to incomplete
regeneration
• Frequent stop-and-go driving or
low-duty cycles
• High oil consumption or poor-quality
DPF cleaning
Prevention Tips:
• Always use fresh, ISO-spec DEF from a
sealed container.
• Regularly inspect the DEF injector for buildup.
• Ensure your vehicle’s software is up to date.
The DOC generates the heat needed for DPF
regeneration. When contaminated, it loses
efficiency, leading to frequent parked regens
and downstream component failures.
Common Failures:
• Contamination from oil, coolant, or sulfur
• Thermal cracking due to excessive heat
• Face plugging from soot overload
• Key Causes:
• Poor fuel quality or excessive idling
• Failing injectors or turbocharger issues
• Engine oil consumption
Prevention Tips:
• Monitor temperature differences
during regeneration.
• Address engine issues like injector
or EGR leaks promptly.
• Use high-quality ULSD fuel and
approved engine oils.
4
Prevention Tips:
• Track regeneration frequency—an increase
is a warning sign.
• Adhere to proper ash service and cleaning
intervals.
• Ensure the DPF is mounted correctly to
prevent vibration stress.
SELECTIVE CATALYTIC REDUCTION
(SCR) PERFORMANCE
The SCR system uses Diesel Exhaust Fluid
(DEF) to reduce NOx emissions. Performance
issues often stem from DEF quality,
contamination, or dosing system problems.
Common Failures:
• DEF crystallization and injector buildup
•
Poor NOx conversion efficiency
Catalyst poisoning or internal cracking
CLAMPS & GASKETS
These critical components ensure a sealed
exhaust system. Even small leaks can
affect sensor readings, reduce regeneration
efficiency, and trigger fault codes.
Common Failures:
• Exhaust leaks at joints
• Warped flanges from improper torque
• Gasket blowouts
Key Causes:
• Reusing old or stretched hardware
• Incorrect torque specifications during
installation
• Component misalignment
Prevention Tips:
• Always replace clamps and gaskets when
servicing the system.
• Torque all hardware to OEM specifications.
• Inspect for leaks and soot trails after
installation.
