DETROIT DIESEL |

DEMAND PERFORMANCE”

No.: 14 TS-14REV
June 20, 2014

TO: Service Locations

FROM: Service Systems Development

SUBJECT: Guidelines for EPA10 and GHG14 Aftertreatment Cores
Issue

EPA10 and GHG14 Diesel Particulate Filters (DPF) for 1-Box™ emissions package and Two-
Box option aftertreatment applications and all 1-Box DOC/SCR modules assemblies are
eligible for full core credits, except units that have physical damage as described in this
document. In the event damage is present, cores will be eligible for a single partial credit
amount that is established by Detroit™ and may be evaluated and revised periodically. Many
of the issues shown are due to improper service and are considered unusable.

Air Cleaning Diesel Particulate Filters: Detroit does not endorse ash measuring and air
cleaning on EPA10 and GHG14 Diesel Particulate Filter (DPF). Data has shown that air
cleaning the filter does not consistently achieve a uniform removal of ash across the filter. Ash
left behind from air cleaning results in hot spots within the substrate, leading to cracks, which
allow unfiltered exhaust to pass through the DPF. Detroit’s ReMan offers new lower priced
cleaned DPFs starting May 7, 2014 for service. The graphic below illustrates the ash content
of an air-cleaned filter.

3D View of Ash Content After Inadequate Cleaning

Se ET

Ash Pockets

after Inacequate

Copaning.

Ast Depth Process
finches

| —~ Eui Ash Loading

“SN. pets Reman

Clean

Detroit Diesel Corporation 13400 Outer Drive, West / Detroit, Michigan 48239-4001
14 TS? -2- 6/27/2014

Excessive ash acumulation in the DPF from improper cleaning will also lead to over temp of
the filter. Once the filter exceeds 790°C, platinum in the filter vaporizes and passes to the SCR.
The SCR Catalyst is then poisoned, resulting in a “Low NOx Conversion Efficiency” fault and
replacment of the SCR Catalyst.

CORE ACCEPTANCE GUIDELINES

Vertical Cracking: Cracks that run laterally through the substrate and can be seen on one or
both sides of the surface. Cracks running symmetrically along the structure or in a webbed
pattern, indicate extensive cell damage in the interior of the substrate and are considered
unacceptable.

Substrate Surface Damage: The DPFs shown below have experienced substrate surface
damage caused by gouges. Any damage to the surface of the substrate that is greater than
.125” (3.18 mm) below the substrate surface, .500" (12.7 mm) in length and .251” (6.38 mm) in
width will affect integrity of the substrate. See the lower left picture for an example of an
unacceptable gouge. Use the illustration below to clarify maximum gouge specification. If the
edge chips (lower right picture) extend to a depth that exceeds .125 in. (3.18 mm) and extends
from the outer edge toward the center (being more than three cell rows), the DPF core is
subject to unacceptable core charges.

Note: Photo shown may be from EPA07, EPA10 or GHG14 components. The substrate failure
mode shown is consistent with all model years regardless of the exterior Can. The straps and
bands used on the DPF are different depending on the application.
Specification Limit:
Radial (A}
Less than or equal to 00" (12.7 mm}

pet

Circum (B}
Less than or equal to .251" (6.38mm)}

Axial (C}
Less than or equal ta .125" (3.18 mm)

@ Maximun gouge per face not to exceed 3
® Minimum separation between gouges is 1.960" (29. 78mm)
e Cumulative gouge are not to exceed 0.5% of substrate face

Substrate Slippage: Substrate which moves inside the stainless steel can is known as
slippage, caused by unusually high back pressure. Substrates flush or protruding past the can
flange that come into contact with or within 2” (12.7 mm) of sensor or sensor bung are
considered unacceptable.

Foreign Matter: If the DPF cells are restricted (any foreign matter) on the surface of the
substrate, covering an area the size of more than one square inch, then this is considered
unacceptable.

Note: Photo shown may be from EPA07, EPA10 or GHG14 components. The substrate failure
mode shown is consistent with all model years regardless of the exterior Can. The straps and
bands used on the DPF are different depending on the application.
14 TS? -4- 6/27/2014

Horizontal Cracks: If the DPF substrate face has any soot residue around the
circumference of the substrate, that could be an indication of internal cracks. Internal
horizontal cracks allow soot and ash to pass through the substrate. Soot evidence, identified
with a wipe of a light colored cloth, can be a slight amount of black film around the edges of
ihe exhaust side to moderate and extreme cases where soot buildup occurs. All
circumstances are considered unacceptable core.

Slight soot film Moderate soot residue Extreme soot buildup

Fusion or Melting: If the substrate has experienced a burn through, where the face of the
substrate may be partially melted or exhibits black splotches of soot, the cell structure has
been converted to molten ceramic due to an uncontrolled thermal event and is considered an
unacceptable core.

Substrate Canning Damage: Witness marks from band clamps are acceptable as long as the
worn or rusted area has not penetrated through the can.

Note: Photo shown may be from EPA07, EPA10 or GHG14 components. The substrate failure

mode shown is consistent with all model years regardless of the exterior Can. The straps and
bands used on the DPF are different depending on the application.
14 TS? -5- 6/27/2014

Major Dents: Punciures or major dents in the can caused by road hazards, handling, and/or
shipping, are not acceptable. A major dent is defined by any indentation 2 inch (50.8 mm) in
diameter or that exceeds 1/2 inch (12.7 mm) below the surface of the can.

Flange damage is unacceptable when the inner flange is crimped behind the outer flange; see
the example to the left; however the flange damage on right is minor and acceptable.

Not Acceptable Flange Damage Acceptable Flange Damage

Packaging: Filter core must be packaged and returned in the barrels provided with the
replacement component.

NOTE: If any major component of the aftertreatment system is replaced, the root cause of its
failure must be repaired. Failure to make necessary repairs may result in a premature failure of
the replacement.

Note: Photo shown may be from EPA07, EPA10 or GHG14 components. The substrate failure
mode shown is consistent with all model years regardless of the exterior Can. The straps and
bands used on the DPF are different depending on the application.
14 TS-2? -6- 6/27/2014

DOC/SCR 1-BOX SYSTEMS

Unacceptable core subject to partial credit: Dents that exceed 1/2" (12.7 mm)
depth, due to non-operational damage, that may impede internal chamber functions, or
are severe enough to crease the exterior chambers of the box, or holes and punctures
through the casing.

Acceptable: Small, cosmetic dents caused by gravel or other minor road debris, that are
less than 2" (50.8 mm) in diameter and 1/2" (12.7 mm) deep, or that have not creased or
punctured the exterior chamber.

CONTACT INFORMATION

Core reimbursement amounts may vary for the acceptable and unacceptable
reimbursement amounts. If you have any questions or concerns, please contact the
Detroit™ Core Eligibility at [email protected].

Note: Photo shown may be from EPA07, EPA10 or GHG14 componenis. The substrate failure
mode shown is consistent with all model years regardless of the exterior Can. The straps and
bands used on the DPF are different depending on the application.