Perkins 904J-E36TA Operation And Maintenance Manual page 90

90
Maintenance Section
Fluid Recommendations
Consult your local Perkins distributor for additional
information on Perkins designed and produced
filtration products.
Fluid Recommendations
(Diesel Exhaust Fluid (DEF))
General Information
Diesel Exhaust Fluid (DEF) is a liquid that is injected
into the aftertreatment system before Selective
Catalytic Reduction (SCR). This system of injecting
the DEF into the exhaust will cause a chemical
reaction in the SCR system. The Nitrogen Oxide
(NOx) molecules in the exhaust are converted to
elemental nitrogen and water. This conversion will
reduce the emission of the engine.
Specification
DEF that is used in Perkins engines must meet the
ISO specification 22241-1 for quality. The ISO
specification 22241-1 requirements are met by many
brands of DEF, including the ones that carry the
AdBlue or API certification."
The document series ISO standard 22241 will give
information on quality requirements, test methods,
handling, transportation, storage, and refilling
interface.
Spillage
Care should be taken when dispensing DEF. Spills
should be cleaned immediately. All surfaces should
be wiped clean and rinsed with water.
DEF that has been spilt will crystallize when the
water within the liquid evaporates. Spilt DEF will
attack paint and metal. If DEF is spilt, wash the area
with water.
Caution should be used when dispensing DEF near
an engine that has recently been running. Spilling
DEF onto hot components may cause the release of
ammonia vapors. Do not breathe ammonia vapors.
Do not clean up any spills with bleach.
Filling the DEF Tank
The fill cap on the DEF tank must be colored blue.
The DEF level is important, allowing the DEF tank to
run dry or operate at a low level can affect the engine
operation. Because of the corrosive nature of DEF,
the correct materials must be used when filling a DEF
tank.
DEF Quality
The quality of DEF can be measured by using a
refractometer. The DEF must comply with ISO
standard 22241-1 with the urea solution of 32.5
i07636462
percent. Perkins offer a T400195 Refractometer for
checking the concentration of the DEF.
Cleanliness
Contaminants can degrade the quality and life of
DEF. Filtering DEF is recommended when dispensed
into the DEF tank. Filters should be compatible with
DEF and should be used exclusively with DEF.
Check with the filter supplier to confirm compatibility
with DEF before using. Mesh-type filters using
compatible metals, such as stainless steel, are
recommended. Paper (cellulose) media and some
synthetic filter media are not recommended because
of degradation during use.
Care should be taken when dispensing DEF. Spills
should be cleaned immediately. Machine or engine
surfaces should be wiped clean and rinsed with
water. Caution should be used when dispensing DEF
near an engine that has recently been running.
Spilling DEF onto hot components will cause harmful
vapors.
Storage
Do not store DEF in direct sunlight.
Table 22
Storage Temperature
Below 25° C (77° F)
25° C (77° F) to 30° C (86° F)
30° C (86° F) to 35° C (95° F)
Above 35° C (95° F)
Perkins recommend that all DEF taken from storage
should be checked to ensure that the DEF meets ISO
standard 22241-1.
Materials compatibility
DEF is corrosive. Due to the corrosion caused, DEF
must be stored in tanks constructed of approved
materials. Recommended storage materials:
Stainless Steels:
• 304 (S30400)
• 304L (S30403)
• 316 (S31600)
• 316L (S31603)
Alloys and metals:
• Chromium Nickel (CrNi)
M0092609-05
Expected DEF Life
18 months
12 months
6 months
test quality before use