{"product_id":"4353361-cummins®-inlet-catalyst-module-6-7l-isb-qsb","title":"4353361 | Cummins® Inlet Catalyst Module 6.7L ISB\/QSB","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: Inlet Catalyst Module 6.7L ISB\/QSB\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e: New\u003cbr\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e: Cummins®\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 4353361,4353361RX\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eVehicle Fitment 4353361:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"2\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"2\"\u003e1. Engine Compatibility\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eThis module is designed for the 6.7-liter displacement family, including:\u003c\/p\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"4,0,0\"\u003eCummins ISB 6.7:\u003c\/b\u003e Used primarily in on-highway commercial trucks and buses.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"4,1,0\"\u003eCummins QSB 6.7:\u003c\/b\u003e Used in off-road industrial, construction, and agricultural equipment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"4,2,0\"\u003ePaccar PX-6 \/ PX-7:\u003c\/b\u003e Branded versions of the Cummins 6.7L found in medium-duty trucks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"5\"\u003e2. Common Vehicle Fitment\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"6\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"6,0,0\"\u003eMedium-Duty Trucks:\u003c\/b\u003e Freightliner (M2 106), Kenworth (T270, T370), Peterbilt (337, 348), and International (MV Series).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"6,1,0\"\u003eSchool Buses:\u003c\/b\u003e Blue Bird, Thomas Built, and IC Bus models equipped with the ISB 6.7 engine.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"6,2,0\"\u003eEmergency Vehicles:\u003c\/b\u003e Fire trucks and ambulances using the 6.7L platform.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"6,3,0\"\u003eIndustrial\/Construction:\u003c\/b\u003e Excavators, loaders, and generators (e.g., Komatsu, Terex, or Cummins Power Generation) using the QSB 6.7 Tier 4 engine.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe Inlet Catalyst Module \u003cstrong\u003e4353361\u003c\/strong\u003e is a stainless steel canister located upstream of the Diesel Particulate Filter (DPF). Its primary job is to receive raw exhaust gases directly from the engine turbocharger and begin the chemical cleaning process.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cul\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eOxidation:\u003c\/b\u003e It uses precious metals (like platinum or palladium) to convert Carbon Monoxide (CO) and unburnt hydrocarbons into Carbon Dioxide (\u003cspan class=\"math-inline\" data-math=\"CO_2\" data-index-in-node=\"142\"\u003eCO2\u003c\/span\u003e) and water.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eHeat Generation:\u003c\/b\u003e It facilitates \"Active Regeneration.\" By oxidizing a small amount of diesel fuel injected into the exhaust stream, it raises the exhaust temperature high enough to burn off the soot trapped in the downstream DPF.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"math-inline\" data-math=\"NO_2\" data-index-in-node=\"0\"\u003eNO2\u003c\/span\u003e Conversion:\u003c\/b\u003e It converts Nitric Oxide (\u003cspan class=\"math-inline\" data-math=\"NO\" data-index-in-node=\"43\"\u003eNO\u003c\/span\u003e) into Nitrogen Dioxide (\u003cspan class=\"math-inline\" data-math=\"NO_2\" data-index-in-node=\"70\"\u003eNO2\u003c\/span\u003e), which helps the Selective Catalytic Reduction (SCR) system work more efficiently further down the line.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSigns of Faulty 4353361:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"2\"\u003e\u003cb data-path-to-node=\"2\" data-index-in-node=\"0\"\u003e1. Frequent or Failed Regenerations\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eThe most common sign is that the engine requests \"Parked Regen\" more often than usual. If the DOC is \"face-plugged\" (clogged with soot or oil) or chemically depleted, it cannot generate enough heat to burn soot out of the DPF.\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003e\u003cb data-path-to-node=\"4\" data-index-in-node=\"0\"\u003e2. Fault Codes (Check Engine Light)\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003eYou will likely see Cummins-specific fault codes or generic OBDII codes, such as:\u003c\/p\u003e\n\u003cul data-path-to-node=\"6\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,0,0\"\u003e\u003cb data-path-to-node=\"6,0,0\" data-index-in-node=\"0\"\u003eFC1691 \/ FC1694:\u003c\/b\u003e Related to low catalyst efficiency.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,1,0\"\u003e\u003cb data-path-to-node=\"6,1,0\" data-index-in-node=\"0\"\u003eFC2639:\u003c\/b\u003e Indicating the DPF is not regenerating properly due to low inlet temperatures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,2,0\"\u003e\u003cb data-path-to-node=\"6,2,0\" data-index-in-node=\"0\"\u003eP0420:\u003c\/b\u003e Catalyst System Efficiency Below Threshold.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003e3. Increased Backpressure and Power Loss\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003eIf the catalyst is physically blocked, the engine will struggle to \"breathe.\" This leads to:\u003c\/p\u003e\n\u003cul data-path-to-node=\"9\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,0,0\"\u003eNoticeable loss of horsepower.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,1,0\"\u003ePoor fuel economy.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,2,0\"\u003eThe engine may enter \"Limp Mode\" (derate) to protect the turbocharger.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003e4. Visible Damage or Discoloration\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"11\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,0,0\"\u003e\u003cb data-path-to-node=\"11,0,0\" data-index-in-node=\"0\"\u003eExternal:\u003c\/b\u003e Blueing or extreme discoloration of the stainless steel canister indicates severe overheating.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,1,0\"\u003e\u003cb data-path-to-node=\"11,1,0\" data-index-in-node=\"0\"\u003eInternal:\u003c\/b\u003e If you remove the module, you may see \"face-plugging\" (a thick layer of black soot on the honeycomb) or physical melting of the ceramic substrate.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003eCummins® is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days\u003c\/strong\u003e warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website. \u003c\/p\u003e","brand":"Cummins®","offers":[{"title":"Default Title","offer_id":48025889898740,"sku":"4353361","price":4569.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/photo_2026-04-21_23-19-29.jpg?v=1776809234","url":"https:\/\/firsttruckparts.com\/en-ca\/products\/4353361-cummins%c2%ae-inlet-catalyst-module-6-7l-isb-qsb","provider":"First Truck Parts","version":"1.0","type":"link"}