The exhaust and aftertreatment system manages combustion gases from the engine cylinders through to atmospheric discharge, while reducing harmful emissions to meet regulatory standards. Key components include exhaust manifolds, turbocharger connections, exhaust outlet piping, diesel particulate filters (DPF), selective catalytic reduction (SCR) catalyst modules, diesel exhaust fluid (DEF) dosing systems, and EGR (exhaust gas recirculation) components. Aftertreatment systems on Tier 4 and Stage V Cummins engines are particularly complex and require correctly specified replacement components to maintain emissions compliance and avoid engine derating.
AMS Parts supplies a wide range of exhaust & aftertreatment components for Cummins engines used in power generation, marine, and industrial applications. Browse a selection of available parts below, or contact us for specific requirements.
Below is a selection of exhaust & aftertreatment parts we supply. Use the search bar above to find a specific part number, or request a quote. You can also reach us directly at [email protected] or +44 7776 800169.
The ECM will typically log a fault code and may derate the engine (reduce power output) to protect the aftertreatment system and maintain emissions compliance. Prolonged operation with a faulty aftertreatment component can lead to further damage and potential regulatory non-compliance.
Service intervals vary by engine model and application. DPF regeneration typically happens automatically, but the DPF may eventually require cleaning or replacement. SCR catalyst and DEF dosing components are inspected at scheduled service intervals defined in the Cummins maintenance manual.
No. Engines built before emissions regulations (generally pre-Tier 3 / Stage IIIA) typically discharge exhaust directly through a muffler without aftertreatment. Aftertreatment systems were introduced progressively with Tier 4i/Stage IIIB and later emissions standards.
