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Brands Videos In The News Testimonials Shipping Warranty Parts and Engine Returns Policy Financing Contact us Parts/Kits Engines Component Build Engines Cummins 4BT Cummins 4B Long Block Engine Options Cummins 6BT Cummins 6CT Cummins ISB / QSB 4.5L Cummins ISB 24 Valve 5.9L Cummins 855 CAT 3306 Industrial Engines 4BT Jeep Swaps Cummins Power Units Isuzu Power Units Marine Engines About Component Build Assemblies Remanufactured Engines CAT ENGINES CAT C7 Engines CAT C10 Engine CAT C11 Engines Cat C12 Engine Cat C13 Engine Cat C15 Engine Cat 3054 Engine Cat 3066 Engine Cat 3116 Engine Cat 3126 Engine Cat 3208 Engine Cat 3304 Engine Cat 3406 Engine Cat 3408 Engine Cat 3412 Engine CUMMINS ENGINES Cummins ISC (8.3 L) Cummins ISL (8.9 L) Cummins ISX Cummins N14 Engine Cummins ISM Engine DETROIT ENGINES DETROIT 60 SERIES ENGINE DETROIT DD15 ENGINE INTERNATIONAL INTERNATIONAL DT466 ENGINE INTERNATIONAL DT530 ENGINE JOHN DEERE ENGINES John Deere 4045 Engine John Deere 6068 Engine MACK ENGINES MACK E7 ENGINE MACK ASET ENGINE MACK E-TECH ENGINE MACK MP7 ENGINE MACK MP8 ENGINE Advantages of Remanufactured Engines Used Engines Blog Diesel Articles and Tips Featured Authors FAQs Contact Us iphone-spacer iphone-spacer iphone-spacer CALL FOR QUOTE: 844-340-4114 EXPERIENCE THE POWER OF DIESEL View Engines REPLACEMENT CUMMINS 4BT AND 6BT ASSEMBLIES View Engines USEDREMANUFACTURED DIESEL ENGINES View Engines INDUSTRY LEADING WARRANTY View Engines INDUSTRIAL APPLICATIONS View Engines DIESEL ENGINE OFF-ROADING APPLICATIONS View Engines Home AboutBrands Videos In The News Testimonials Shipping Warranty Parts and Engine Returns Policy Financing Contact us Parts/Kits Engines Component Build Engines Cummins 4BT Cummins 4B Long Block Engine Options Cummins 6BT Cummins 6CT Cummins ISB / QSB 4.5L Cummins ISB 24 Valve 5.9L Cummins 855 CAT 3306 Industrial Engines 4BT Jeep Swaps Cummins Power Units Isuzu Power Units Marine Engines About Component Build Assemblies Remanufactured Engines CAT ENGINES CAT C7 Engines CAT C10 Engine CAT C11 Engines Cat C12 Engine Cat C13 Engine Cat C15 Engine Cat 3054 Engine Cat 3066 Engine Cat 3116 Engine Cat 3126 Engine Cat 3208 Engine Cat 3304 Engine Cat 3406 Engine Cat 3408 Engine Cat 3412 Engine CUMMINS ENGINES Cummins ISC (8.3 L) Cummins ISL (8.9 L) Cummins ISX Cummins N14 Engine Cummins ISM Engine DETROIT ENGINES DETROIT 60 SERIES ENGINE DETROIT DD15 ENGINE INTERNATIONAL INTERNATIONAL DT466 ENGINE INTERNATIONAL DT530 ENGINE JOHN DEERE ENGINES John Deere 4045 Engine John Deere 6068 Engine MACK ENGINES MACK E7 ENGINE MACK ASET ENGINE MACK E-TECH ENGINE MACK MP7 ENGINE MACK MP8 ENGINE Advantages of Remanufactured Engines Used Engines Blog Diesel Articles and Tips Featured Authors FAQs Contact Us iphone-spacer iphone-spacer iphone-spacer CALL FOR QUOTE: 844-340-4114 844-340-4114 Available Models CUMMINS 4BT We have new Cummins 4BT Engines in Stock from 105 hp - 140 hp with 3 different models available. Perfect for a 4BT Jeep Swap or Industrial Application. Read more CUMMINS 5.9 / 6BT The Cummins 6BT (5.9 L) was one of the most popular medium duty diesel engines ever produced. We offer 16 models of the 6BT from 215 hp - 300 hp including marine applications Read more CAT 3306 The Caterpillar 3306 is a very reliable workhorse in the CAT Lineup of Engines. We offer a universal higher horsepower piston configured engine rated at 330 hp Read more See more engines High Performance Diesel Engines Look no further for all of your small heavy duty diesel engine needs. We here at Big Bear Engine Company specialize in Cummins 4BT, Cummins 6BT and Caterpillar 3306 replacement parts assemblies. Our high performance diesel engines are manufactured with all brand new parts and produced to the specific OEM serial numbers to match your application. Cummins 4BT Engines in particular are perfect for 4BT Jeep Swaps as well as Industrial Applications. • Cummins 4BT, 6BT, 6CT and CAT 3306 Replacement Assemblies Available • Long Blocks and Extended Long Block Component Build Options • UsedRemanufactured Engines Also Available • Get Back to Work Quickly – Ships Anywhere in the World • 1 Year Unlimited Miles Warranty • Save On Average 57% Over Dealers • 4BT Jeep Swap Friendly • Industrial Rated: Skid Steers, Dozers, Loaders, Wood Chippers, Forklifts Read moreRemanufacturedUsed Engines When a component build option isn’t ideal we also offer many used Cummins 4BT engines as well as remanufactured engines. We are an experience source for used Cummins 4bt and Cummins 6bt engines which are all low miles, run tested and have been inspected for major wear. Our sister company remanufactures everything to OEM spec using brand new parts at the neighboring facility facility in Denver, Colorado. The two companies consist of a full service machine shop and engine rebuilding facility with 30 machinists and master engine builders. Remanufactured Cummins 4BT Engines all come with a 1 year warranty and are inspected with using a rigorous 11 point QA procedure before they ever leave our facility. View Remanufactured Engines Overhaul Kits and New Parts We are a one stop shop for all the parts you need for your Cummins 4BT, 6BT and CAT 3306 engines. Whether you are looking for a water pump or a full overhaul kit for your engine; we got you covered. Call us today for turbos, injectors, water pumps, oil pumps, aftercoolers, camshafts, crankshafts, cylinder heads, crankshafts, bearings, pistons, inframe kits and overhaul kits. Cummins 4BT Rebuild Kits can ship the same day as order. View Parts Department 4BT Jeep Swaps A popular application for Cummins 4BT Engines is in the use of off-road vehicles. 4BT Jeep Swaps are more than an engine option but a way of life for many enthusiasts. Cummins 4BT Engines are used in Jeep Wranglers, Jeep Grand Cherokees, Land Rovers, Toyota 4Runners, Toyota Land Cruisers, Nissan Xterras, Mercedes-Benz G500s, Ford F150s, Ford Raptors, Dodge Ram 2500s, and Chevy Colorado’s. 4BT engines are swapped in due to the increased horsepower and rugged torque ratios. Read More About 4BT Swaps Industrial Applications The Cummins 4BT Engine and the bigger Cummins 6BT Engine are found in many small industrial applications. They are a popular engine choice for their durability, ease of use and reliability to get the job done. We understand the industrial off-road market… every day you are down you are losing money. Our diesel engines can be shipped the same day of order. If you have a dozer, skid steer, forklift, boom lift, wood chipper, baggage cart, loaders, street sweepers, step van, tour bus, RV or small marine application the Cummins 4BT, 6BT or the CAT 3306 engine is perfect to get back to work again. View Industrial Engines Shipping We have the logistical capabilities to ship anywhere in the world. Both engines and parts can be shipped the same day of order. Read more Financing We provide financing plans for our customers who prefer a long-term payment option. The approval process is quick, hassle free and does not require any upfront capital. Conserve your working capital and get back on the road quickly. Read more Popular Off-Road Trails We here at Big Bear, love off-roading as much as you do. Click here to read about some of our most favorite off-road and 4x4 trails in Colorado. Read more Install Partners Awesome! Now that you’ve purchased that Cummins 4BT or 6BT Engine check out one of our partners to help you install the engine. Read more Product Gallery Cummins 4BT Engines 4BT Extended Longblock (Bosch Injectors) 4BTAA Extended Long Block (Rotary) Cummins 6BT Extended Longblock Caterpillar 3306 Complete Engine Cummins 4BT Dozer Application Cummins 4BT Jeep Swap Engine Cummins 4BT Skid Steer Engine About HIGH PERFORMANCE DIESEL ENGINES Big Bear Engine Company has deep roots in the heavy duty diesel industry most notably in the remanufacturing and machining of large diesel engines. Our master engine builders...