Call us

Cummins 4BT Engines and Long Blocks

Replacement Cummins 4BT Engines For Sale

Big Bear Engine Company Warranty SealExperience the power of diesel! Our Cummins 4BT Engines are the best in the business. Whether you are looking to replace small industrial equipment or are looking to upgrade to diesel through a 4BT Jeep Swap we will get you up and running. The Cummins 4BT Engine is a workhorse in its own right offering torque when you need it and the durability to run at full load for long periods of time.

We offer two types of Cummins 4BT Engines: Long blocks and Extended Long Block Engines.

4BT Long Blocks Engines:

Cummins 4BT Surplus EngineOur long blocks are perfect for someone who already has an older Cummins 4BT and is looking to simply replace the worn hard internal parts of the engine and then reuse ancillary parts. As a guide a long block is about 50%-75% a complete build. Think of the "guts of the engine" but nothing dressing it out. To educate customers specifically about long blocks we have created a 4B long block informational page here. Note we also offer a Cummins 4.5 L ISB/QSB long block (rear gear train and front gear train). Our traditional long-block 4B engine includes:

• New Engine Block
• New Cylinder Head (7mm injector setup)
• New Camshaft and Lifters
• New Pistons
• New Rings
• New Oil Pump
• New Oil Cooler (later models)
• New Crankshaft
• New Connecting Rods
• New Rocker Assemblies
• New Timed Front Gear Group
• New Gaskets,Seals, Bearings
• Standard 6 Months Parts Replacement Warranty
• 1 and 2 Year Extended Warranties also Available
*Note long blocks may or may not come with front cover, gear housing, rockers, valve cover or oil pan depending on parts availability

4BT Extended Long Block Engines:

Our component build extended long block packages come with most everything you need to replace your existing failed engine. These Cummins 4BT Engines are built with brand new ISO 9001 parts, to exact OEM tolerances and have less than a 1% parts failure rate. As a guide a component build is about 90% OEM parts 10% aftermarket when available. These are units are perfect for a customer looking to replace an existing 4B assembly but also needs a new turbo or oil pump etc...  As a guide an extended long block is about 75% built out and is best used in conjunction with an existing 4B. Most customers will reuse existing workable parts off of their old engine as needed. We do not sell adapter plates, torque converters, transmissions/PTOs, axles, suspensions, hydroboosts, air cross over tubes, throttle linkages, radiators, differentials or motor mounts with extended long block packages. Additionally, extended long blocks do not come with starter, alternator, flywheel, flywheel housing (SAE#2 or SAE #3) but are available for additional one off purchase if failed on the customer's engine. Most customers reuse those components as they rarely fail. Extended long block builds are run tested prior to shipment. Our extended long block assemblies include:

• New Block
• New Cylinder Head
• New Camshaft and Lifters
• New Crankshaft
• New Connecting Rods
• New Rocker Assemblies
• New Gaskets, Rings, Seals, Wrist Pins, Bearings
• New Injectors
AERA Association Member• New Oil Pump and Water Pump
• New Oil Cooler
• New Oil Filters
• New Intake and Exhaust Manifolds
• New Housings (Front and Rear)
• New Brackets and Pullys
• New Fuel Injector Pump
• New Timed Front Gear Group
• New Valve Cover
• New Turbo
• New Aftercooler (only on some models)
• New Air Compressor (only on some models)
• New Rear Sump Oil Pan and Pickup Tube
• Standard 6 Months Parts Replacement Warranty
• 1 and 2 Year Extended Warranties also Available

4BT Engine Models:

• 4BT 105 HP - (Inline A Pump)
• 4BTA 130 HP - (Inline A Pump)
• 4BTAA 140 HP - (Rotary or P-7100 Fuel Pumps)

Cummins 4BT Engine Industrial Applications:

Cummins 4BT Engines are primarily used in industrial applications. The engine was primarily installed in step vans and “bread trucks” for hauling cargo around cities. 4BT engines are also very popular in skid steers, loaders, dozers, forklifts, manlifts, wood chippers, RVs, shuttle vans, pumps, generators, street sweepers and baggage carts. Some Cummins 4BT engines are also in use in small boats and bilge pumps but mainly use in small off-highway equipment.

Cummins 4BT Engine Off-Roading Applications:

Cummins 4BT New Engines The off-roading community has taken quite a liking to the Cummins 4BT engine; known primarily as 4BT Jeep Swaps. The engine won’t win any races as the maximum horsepower is only 105 hp at 2,300 rpm however the engine is extremely popular when it comes to the torque ratio. The standard 4BT will produce 265 lb-ft of torque at 1,600 rpm however common upgrades can increase the torque ratio to well over 750 lb-ft of torque. That is a lot of torque at the wheels; perfect for traversing steep inclines or hugging the edge of a trail. There is a whole community over at that focuses on all the info you will ever need to swap a diesel engine into a off-road vehicle.

Cummins 4BT engines are also easy to maintain, simple in design and can get upwards of 30-40 mpg with performance upgrades. The 4BT is the most popular diesel engine swap for off-roading because it is simple to upgrade the turbo, camshaft, injectors and fuel pumps in addition to being the biggest diesel engine that will easily fit into a Jeep or 4Runner. A Cummins 6BT will simply be too large.

Note, long block and extended long block replacement units are sold for use in existing industrial and automotive applications. Intended use of the long block or extended long block package is meant to replace worn or defective existing internal gear train engine components. Bellhousing, fuel systems, solenoids and electrical parts are included are intended for individual one off parts replacement of existing worn engine components from the customer’s existing engine.

If extended long block packages are swapped into an off road utility vehicle or marine application it is up to the customer to check for local, state and federal regulations in reference to emissions compliance and legal permitting. Big Bear Engine Company is not responsible for any non intended use of extended long block packages. Each state and even local counties have widely different regulations (Classic Cars, Rat Rods, Rock Crawling Vehicles, Gross Tonnage, Number of Axles, etc...) so it is always best to do your homework beforehand.

Cummins 4BT Specs

Cummins 4BT Spec

Engine Data

Configuration Inline 4 Cylinder
Displacement 3.9 L, 239 cubic inches
Bore x Stroke 4.02" x 4.72"
Cylinder Head Cast Iron
Engine Block Cast Iron
Firing Order 1-3-4-2
Compression Ratio 17.5 : 1
Injection Direct Injection, Mechanical Injection Pump
Aspiration Turbocharged, non-intercooled
Valve Train OHV, 2 valves per cylinder
Weight 745-782 lbs with oil
Oil Capacity 10 quarts
Governor Speed Varies with application
Horsepower 105 hp @ 2300 rpm
Torque 265 lb-ft @ 1600 rpm
Give us a call today at 844-340-4114 for immediate sales and support for the Cummins 4BT, Cummins 6BT or CAT 3306. If you have any questions check out our FAQ Page. We are always ready to help or just listen to your crazy off-roading adventures!

Request A Quote


140 HP 4BT Engine Unit Arrival 1
140 HP 4BT Engine Unit Arrival 2
140 HP 4BT Engine Unit Arrival 3
4BT 105 2
4BT 105 3
4BT 105 4
4BT 105 5
4BT Crate 2
4BT Crate 4
4BT Engines
4BT Extended Longblock (Bosch Injectors)
4BT Jeep Swap Engines
4BTAA Extended Long Block (Rotary)
Chad Crate 7
Cummins 4BT 105 HP BBEC
Cummins 4BT 130 HP BBEC
Cummins 4BT 140 HP BBEC
Cummins 4BT Black Engine
Cummins 4BT Dozer Application
Cummins 4BT Dozer Engine
Cummins 4BT Engine Big Bear 1
Cummins 4BT Engine Big Bear 2
Cummins 4BT Engine Big Bear 3
Cummins 4BT Engine Big Bear 4
Cummins 4BT Engine Big Bear 5
Cummins 4BT Engine Big Bear 6
Cummins 4BT Engines
Cummins 4BT Industrial Picture
Cummins 4BT Marine White
Cummins 4BT Pic Red
Cummins 4BT Skid Steer Engine
Cummins 4BT Step Van Engine
Cummins 4BT Wood Chipper
Cummins 4BTs Production

Request a Quote

Please fill out the form below with your information and request. A member of our staff will be with you shortly.

Big Bear Engine Company Buyer's Guide

Need help researching a 4BT swap?

Get the FREE 10-page buyer's guide