TFL JUL
20
FREIGHT AND LOGISTICS
FUELS AND FILTERS
Redefining compact
power capability
The new Cummins QSF3.8
engine is ready to meet EPA
Tier 4 Final and EU Stage IV
emissions regulations.
THE QSF3.8
simplifies machine integration by meeting near-zero emissions standards with
a Selective Catalytic Reduction (SCR) only aftertreatment system. With Particulate Matter
(PM) reduction focused in-cylinder, the QSF3.8 avoids the need for either a Diesel Oxidation
Catalyst (DOC) or a Diesel Particulate Filter (DPF).
The innovative SCR-only system features an extra-high efficiency catalyst able to convert
Oxides of Nitrogen (NOx) emissions at lower exhaust temperatures, while requiring only low
dosing levels of Diesel Exhaust Fluid/AdBlue.
The higher efficiency of the SCR-only aftertreatment also reduces the amount of cooled
exhaust gas being recirculated (EGR) by the engine, with a corresponding reduction in engine
loading and cooling demand. The lighter flow EGR system enables the performance potential
of the QSF3.8 to be fully realised, with the 98kW output leading the below 4-litre engine
class. Peak torque of 488Nm is effortlessly delivered by the simple, but effective Cummins
wastegated turbocharger used for all QSF3.8 ratings.
The QSF3.8 continues to uphold the enviable reputation established by the popular Cummins
QSB3.3 at Tier 4 Interim/Stage IIIB emissions regulations. Although it is larger in displacement
and meets stricter emissions standards, the QSF3.8 achieves fuel efficiency similar to that of
the 3.3-litre engine while providing 10 percent higher power output and increasing peak
torque by 18 percent.
The QSF3.8 is equivalent in engine size and weight to the current QSB3.3, providing an easier
transition from Tier 4 Interim to Tier 4 Final for compact equipment installations.
The new 3.8-litre engine will be available for equipment manufacturers ahead of EU Stage IV
standards commencing October 2014 and Tier 4 Final taking effect January 2015 for engines
within the 56 to129kW category.
Smaller meets stronger
The QSF3.8 is built with exceptional strength at the heart of the engine, capable of the same
peak cylinder pressure as the larger Cummins QSB4.5. This means the QSF3.8 is designed to
operate at relaxed ease, resulting in higher in-service reliability and engine durability than
equipment operators or rental companies will have experienced before from a compact
engine, enhancing the residual value of their QSF3.8 powered equipment.
The QSF3.8 also takes a design lead from the Cummins QSB4.5 engine by featuring a rear
gear train, providing superior mounting stiffness and lower gear noise. The high strength cast-
iron block is a sculpted design, allowing unnecessary weight to be removed while retaining
maximum rigidity. The use of composite material for the valve cover and oil pan brings a further
weight reduction, contributing to the impressive power-to-weight credentials of the QSF3.8.
Less to service
Servicing is made simpler through remote mounting of the Electronic Control Module (ECM)
for easy plug-in diagnostics and data downloads. The oil fill, lube filter and fuel filter are
set up for rapid service, with 500-hour intervals. The QSF3.8 features the Cummins Direct
FlowTM air filtration system, providing greater dust-holding capacity in a smaller package
and a filter element change interval at least twice that of a conventional air filter. The filter
also features an embedded smart sensor to fully integrate air-intake flow with the engine
