Mack M359, Manual

Page: 218 / 332

EMISSION SOLUTION AND CONTROL
AFTERTREATMENT, MACK
Diesel Exhaust Fluid
CAUTION
To avoid tank damage, do not attempt to
top-off Diesel Exhaust Fluid (DEF). DEF
expands when frozen and air volume
space at the top of the tank is needed.
Diesel Exhaust Fluid (DEF) is a reactant
that is key to the SCR process. DEF is a
nontoxic, ultra-pure solution of urea and
ultra-pure water. Urea is a compound of
nitrogen that turns to ammonia when
heated. The fluid is non-flammable, and
is not dangerous when handled as
recommended. However, it is highly
corrosive to certain metals, especially
copper and brass. Read the separate
section concerning the handling of DEF
solution.
Use only Diesel Exhaust Fluid that is
clearly labeled as meeting ISO-22241
standards, and certified by the American
Petroleum Institute. The container must
display the API certification seal. Never
use agricultural or industrial grade urea.
Use of fluids other than API certified
Diesel Exhaust Fluid will compromise
aftertreatment system performance,
increase emissions, and may impact
your product warranties. There is a DEF
quality sensor that detects diluted DEF.
If dilited DEF is detected the emissions
system will enter into inducement. Never
dilute DEF with water or any other fluid.
NOTE
Diluted Urea will negatively effect engine
performance.
It is recommended that DEF is not
stored in extreme hot or cold conditions,
or for prolonged periods. Follow the
instructions for proper storage and
handling as indicated on the container
or provided with the purchase.
NOTE
Agriculture mixtures are not pure enough
for use in the SCR system and impurities
in the solution comprise the SCR system.
Diesel Exhaust Fluid (DEF)
Handling
When handling DEF solution, it is
important to prevent contact with
electrical connections. There is a risk
that the DEF causes oxidation that
cannot be removed. Water or
compressed air do not help, since DEF
quickly oxidizes certain metals. A
disconnected connector can come into
contact with the DEF solution. If this
situation occurs, the connector must be
replaced immediately to prevent the DEF
solution from creeping further into the
copper wiring.
CAUTION
When detaching hoses and components,
do not spill DEF on disconnected or
unsealed connectors. If DEF is spilled on a
disconnected or unsealed connector, the
connector must be replaced immediately.
Things to know about spilled Diesel
Exhaust Fluid (DEF)
If DEF solution comes into contact with the
skin: Rinse with plenty of water and
remove contaminated clothing.
If DEF solution comes into contact with the
eyes: Rinse for several minutes and call for
medical help if necessary.
If inhaled: Breathe fresh air and call for
medical help if necessary.
Do not allow the DEF solution to come into
contact with other chemicals.
The DEF solution is not flammable. If the
DEF solution is exposed to high
temperatures, the fluid breaks down into
ammonia and carbon dioxide.
The DEF solution is highly corrosive to
certain metals, including copper and brass.
If the DEF solution is spilled onto the
vehicle, wipe off the excess and rinse with
water. Spilled DEF solution can form
concentrated white crystals on the vehicle.
Rinse off these crystals with water.
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