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Coolant Filtration
COOLANT FILTRATION Diesel Engine Coolant Filtration
Overview

It is estimated that 40 to 50% of engine down-time
is due to coolant system failure. This is more than
just annoying, because most coolant system failure
is avoidable. And with today’s diesel engines putting
out more heat, cooling system care has become even
more important than before.

Your engine coolant battles rust, scale formation,
acidity, foaming, silicate drop out and debris while
it works to transfer heat and maintain the right
operating conditions for optimal fuel economy.

Two filtration solutions are available for light and
heavy EGR engines with SCR emissions devices.
OEMs using heavy EGR coolant systems will be
seeing increased thermal cycling and accelerated
coolant additive depletion. Coolant conditions may
need to be checked more frequently to ensure proper
coolant chemical balance.

It’s critical that you understand the exact make-up of
coolant in your engine - the chemical is very specific
to the job and operating environment. Diesel Coolant Trends & Changes

• Increased thermal recycling will accelerate
coolant additive depletion
• Long life coolant and filters
Coolant System Considerations:
• Increased coolant testing (minimum 2x
per year).
• Do you have traditional coolant that will require • Increased use of organic coolants
traditional supplemental coolant additives?

• Do you have an organic acid based coolant?

• Do you have an extended-service traditional Coolant systems are referred to as a closed loop
blend? system with the filter operating in a side loop to the
main flow. This means that a small percentage of
As you consider your options, consider selecting a flow goes through a filter that is designed to capture
fully formulated antifreeze/coolant that meets either large contaminants. Coolant filters intended to
truck maintenance regulations for your region (such maintain additive levels have an internal baffle with
as; U.S. Truck Maintenance Council (TMC) RP 329 or a small hole to control the rate of additive chemical
RP330 specifications). New glycerin formulae that release into the system.
meet the specifications use non-toxic glycerin derived
from renewable sources to effectively extend service Periodic drain and flushing to clean a system is
intervals and provide ultimate protection in a greener important because while coolant filters capture large
product. contaminant and release additive chemicals into
the system, sediment can accumulate in the coolant
Coolant testing should be done at least twice annually system. These sediments act as an insulator keeping
or when major coolant loss occurs. heat in and prevent heat dissipation.

92 • Engine Liquid Filtration www.donaldson.com