KC-734
Service Bulletin Details
Public Details for: KC-734
Diesel particulate filter (dpf) and diesel oxidation catalyst (doc) pin testing procedure - us07 and newer emissions, model year 2008 and newer
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6/30/22, 12:40 PM
Article
Diesel Particulate Filter (DPF) And Diesel
Oxidation Catalyst (DOC) Pin Testing Procedure US07 And Newer Emissions, Model Year 2008 And
Newer
Internal Content
1. Inspect the catalyst for serious damage
The DPF and/or DOC should be inspected and verified free from
observable, serious damage prior to performing a pin test.
• Reuse/replace guidelines for both components can be found in FSB
255-42 Engine Turbocharger and Exhaust Aftertreatment Systems,
located on the Mack Trucks eMedia website.
A filter or catalyst that meets any of the "Replace" guidelines from the
documents should be replaced at that time. A pin test is not necessary if
the component is found to be cracked, melted, severely clogged/plugged,
or passing soot in the case of the DPF.
2. Perform a Pin Test
2.1. A stainless steel probe 15 inches (40 cm) long and .035 inches (0.9
mm) in diameter should be used to perform this test.
• 20 gauge (0.5 mm2) wire is the equivalent of these measurements.
This is for measurement reference only. Copper wire should not be
used for this test as it is not rigid enough to properly evaluate
substrate condition.
2.2. Insert the probe into cells in the pattern outlined in the diagram
below.
• Points 1-8 should be at least 1" from the wall of the filter or catalyst.
• Do not force the probe into the cell. The probe should drop into
the cell with little to no resistance.
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Article
3. Evaluate the Results
• The probe should travel completely through the DOC.
• The probe should reach most of the way into the DPF.
- Example: A clean DPF that is 13 inches (33 cm) tall should allow
approximately 11.5 inches (29 cm) of travel. This can vary if the
filter is not clean due to normal ash buildup.
• Heavy resistance or blockage in either component can indicate
internal damage, deformation or clogging.
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