A DPF (Diesel Particulate Filter) delete on a Cummins 6.7 engine involves removing the DPF and associated components from the exhaust system. Several vendors offer DPF delete kits, providing the necessary pipes to replace the entire exhaust system from the turbo back, or just the DPF section. This guide outlines the process, including addressing the transmission crossmember.
DPF Delete Kits and Components
DPF delete kits typically include pipes to replace the exhaust components. If you choose to delete the catalytic converter as well, you’ll need a new downpipe, the first exhaust piece connected to the turbo. Since the catalytic converter is within the downpipe, replacing it requires lowering or removing the transmission crossmember.
Removing the Transmission Crossmember
Removing the transmission crossmember provides access to the downpipe for easier replacement. Here’s a step-by-step guide:
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Support the Transmission: Position a jack under the transmission, directly behind the crossmember. Raise the jack just enough to support the transmission’s weight when the crossmember is detached. Ensure the jack is securely locked in place to prevent accidental lowering.
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Detach the Transmission: Remove the six nuts securing the transmission to the crossmember. These nuts are located in three slots, with two nuts per slot, and are accessed from above the crossmember.
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Passenger Side Removal: Detach the two bolts or nuts connecting the crossmember to the passenger side of the truck frame.
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Driver Side Removal: Remove the inner bolt securing the crossmember to the driver’s side of the truck frame. Loosen the outer bolt but do not remove it completely. This bolt will act as a hinge.
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Lower the Crossmember: Carefully lower the crossmember, using the remaining driver-side bolt as a hinge. A rubber mallet might be needed to gently persuade the crossmember downward.
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Complete the DPF/Cat Delete: With the crossmember lowered, you now have access to replace the downpipe and other exhaust components.
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Reinstallation: Once the new components are installed, reassemble the crossmember and transmission in reverse order of removal. Ensure all bolts and nuts are tightened to the proper torque specifications.
Importance of Proper Support
Always ensure the jack supporting the transmission is securely locked to prevent it from lowering. Failing to properly support the transmission can cause significant damage, including engine problems, leaky seals, and other issues. Following these steps will allow for a successful DPF and catalytic converter delete on your Cummins 6.7.
