INTRODUCTION
Page 9
ABOUT THE MACK ASET™ AC
DIESEL ENGINE
This publication is intended to provide technicians
with a working knowledge of the ASET™ AC
diesel engine with cooled exhaust gas
recirculation. MACK offers a similar engine to the
AC which is more suited to the vocational
applications called the AI/AMI. The AI/AMI engine
is an internal exhaust gas recirculation design
engine. For service and overhaul procedures for
the ASET™ AI/AMI engine, refer to the 5-110
ASET™ AI/AMI Engines Service Manual.
ASET™ is an acronym meaning Application
Specific Engine Technology.
The ASET™ AC engine design is based on the
E-Tech™ left-side redesign (LSR) with its
plate-type oil cooler and oil filter mounting
arrangement. A redesigned Centri-Max
®
ULTRA,
and later ULTRA PLUS, centrifugal oil filter
assembly and cover housing with an integral oil
fill tube, is incorporated on all AC engines.
The ASET™ AC utilizes a new EECU with
greater capacity which is relocated to the front
left-side of the inlet manifold. The increased
capacity of the EECU requires the addition of a
cooling plate to help dissipate heat. The AC
design also provides for cooling of the exhaust
gases being recirculated through the combustion
chambers.
Descriptions of these design changes and the
other features are provided in detail in the
DESCRIPTION & OPERATION section.
Additionally, the service effects of these changes
on removal, installation, disassembly, assembly,
setup and adjustment procedures, etc., are
included in the MAINTENANCE and REPAIR
INSTRUCTIONS sections.
Development of the ASET™ AC engine has been
driven by three basic requirements. It is designed
to:
앫 Meet the year 2004 exhaust emission
regulations.
앫 Meet customer demands for improved fuel
economy, driveability and engine braking.
앫 Compete in a world market.
Although the drive to reduce emissions levels is
primarily the result of government mandates, the
ASET™AC engine is designed to be durable and
easily maintained and to provide customers with
good performance and fuel economy.
Mack Trucks, Inc. is looking beyond the borders
of North America to increase its market and bring
the quality, toughness and technology associated
with the MACK name to a worldwide audience.
The current environment of global regulations
concerning exhaust emissions, noise and other
factors has leveled the playing field on an
international basis. This means that the
improvements made to meet the North American
environmental regulations are now applied
worldwide.
Heater Core and Optional Fuel
Heater Hose Connection Revisions
Beginning second quarter of 2004, a cooling
system revision was phased into production that
affects the ASET™ AC engines to move the
heater core and optional fuel heater coolant
return hose connection point. This change moves
the heater core and optional fuel heater coolant
return hoses from the thermostat housing bypass
area to new locations on the lower radiator tube.
This change is described in detail in the ENGINE
DESIGN FEATURES section of this manual.
5-111.bk Page 9 Monday, July 10, 2006 2:26 PM
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