Name: Cummins ISB 3.9L Diesel Engine Remanufactured Long Block For Sale
Brand: Cummins
SKU: REMAN-CUMMINS-ISB-140950
Price: 6400.00 USD
Availability: InStock
Rating: 4.8 (127 reviews)

Question 1

How much does a remanufactured Cummins ISB 3.9L engine cost for a 2004 Freightliner FS65?

Accepted Answer

A remanufactured Cummins ISB 3.9L engine typically costs 40-60% less than a brand new engine from the dealer, making it the most cost-effective option for your 2004 Freightliner FS65. The exact price depends on the specific configuration, condition of your core return, and current availability. For an accurate, no-obligation quote on a Cummins ISB remanufactured long block for your 2004 Freightliner FS65, call our engine specialists at (631) 991-7700 or request a quote online. We offer competitive pricing and fast delivery.

Question 2

What is included in a remanufactured Cummins ISB long block engine?

Accepted Answer

A remanufactured Cummins ISB long block includes the engine block, new pistons and rings, reground crankshaft, new bearings, camshaft, reconditioned cylinder head(s), timing components, new oil pump, and complete gasket set. Specifically, our Cummins ISB 3.9L long block comes with: precision-reground crankshaft with new main and rod bearings, new or reground camshaft, cylinder head(s) that are resurfaced and pressure tested, new timing chain or belt with gears and tensioners, new lifters, new valve seals, new front and rear main seals, and new freeze plugs. Every component meets or exceeds OEM specifications.

Question 3

What are the most common problems with the Cummins ISB 3.9L engine?

Accepted Answer

The most common Cummins ISB 3.9L engine problems are egr cooler failures leading to coolant leaks, turbocharger actuator issues causing reduced power, fuel injector problems resulting in rough idle, head gasket failures from overheating. These are well-documented failure points that affect many Cummins ISB engines in service. Our remanufacturing process specifically addresses each of these known issues by using updated components, improved gaskets, and enhanced machining techniques. When you purchase a remanufactured Cummins ISB long block from US Engine Production, these common problems have been corrected during the rebuild process, giving you a more reliable engine than a simple repair would provide.

Question 4

What warranty comes with a remanufactured Cummins ISB engine?

Accepted Answer

Every remanufactured Cummins ISB engine from US Engine Production comes with a comprehensive parts-and-labor warranty backed by over 40 years of remanufacturing experience. Our warranty reflects our confidence in the quality of our process — every Cummins ISB 3.9L engine is dyno tested before shipping to verify horsepower, torque, oil pressure, and overall performance. Warranty terms may vary based on the specific application and whether the engine is for a commercial truck, pickup truck, or industrial application. Contact us at (631) 991-7700 for specific warranty details for your 2004 Freightliner FS65.

Question 5

How long does a remanufactured Cummins ISB engine last?

Accepted Answer

A remanufactured Cummins ISB engine typically lasts 200,000 to 500,000+ miles with proper maintenance — comparable to a brand new engine. The longevity of your remanufactured Cummins ISB 3.9L depends on regular oil changes, proper cooling system maintenance, using the correct fuel and fluids, and following the manufacturer's recommended service intervals. Our remanufactured long blocks are built to OEM specifications using all-new internal components, which is why they deliver the same service life as a factory-new engine.

Question 6

Is a remanufactured Cummins ISB better than a used or rebuilt engine?

Accepted Answer

Yes, a remanufactured Cummins ISB is significantly better than a used or rebuilt engine because every component is replaced or restored to OEM specifications. A used engine has unknown history and remaining life. A rebuilt engine only replaces worn-out parts. Our remanufactured Cummins ISB 3.9L engines are completely disassembled down to the bare block, every component is cleaned and inspected, and all wear items are replaced with new parts — including pistons, bearings, gaskets, seals, timing components, and the oil pump. The engine block and crankshaft are precision machined to factory tolerances, delivering better reliability, longer life, and a stronger warranty than used or rebuilt alternatives.

Question 7

Will a remanufactured Cummins ISB fit my 2004 Freightliner FS65?

Accepted Answer

Yes, our remanufactured Cummins ISB long block engines are built to be a direct, bolt-in replacement for the original engine in your 2004 Freightliner FS65. We match the engine to your specific year, make, model, and configuration to ensure proper compatibility with your vehicle's emissions systems (EGR, DPF, SCR/DEF), engine management computer, wiring harness, and mounting points. When you call us at (631) 991-7700, our specialists will verify the exact engine configuration for your 2004 Freightliner FS65 using your VIN to ensure a perfect match.

Question 8

Do I need to return my old Cummins ISB engine core?

Accepted Answer

Yes, a core return is required when purchasing a remanufactured Cummins ISB long block engine. A refundable core deposit is collected at the time of purchase and is returned to you once we receive your old Cummins ISB 3.9L engine in rebuildable condition. We make the core return process easy and hassle-free. The core return program helps us keep remanufactured engine prices affordable by recycling engine blocks and other reusable components. Your old engine core should be complete and not have any cracked or damaged major castings.

Question 9

How fast can I get a remanufactured Cummins ISB engine shipped?

Accepted Answer

Most remanufactured Cummins ISB engines ship within 1-3 business days with delivery in 3-7 business days to all 50 states. For commercial and fleet customers who need to minimize downtime, we also offer expedited shipping options. Your remanufactured Cummins ISB 3.9L engine is carefully crated and secured on a pallet for safe transport. Call (631) 991-7700 to check current availability and get an estimated delivery date for your 2004 Freightliner FS65.

Question 10

How is a remanufactured Cummins ISB engine tested before shipping?

Accepted Answer

Every remanufactured Cummins ISB long block engine undergoes comprehensive quality testing before it leaves our facility. This includes dynamometer (dyno) testing to verify horsepower output, torque specifications, oil pressure readings, and overall performance meet or exceed OEM specifications for the Cummins ISB 3.9L. We also perform compression testing across all cylinders, leak-down testing, cooling system pressure testing, and a thorough visual inspection. Our quality assurance process ensures that every remanufactured engine we ship performs like a factory-new Cummins ISB engine. We are committed to delivering engines that meet ISO 9001 quality standards.

2004 Freightliner FS65 ISB 3.9 Cummins Remanufactured Long Block Engine

About This Cummins ISB Remanufactured Long Block

Common Cummins ISB Problems We Address

Engine Specifications

Freightliner Vehicle Compatibility

What's Included With Your Remanufactured Long Block

Core Components

Timing Components

Valvetrain

Seals & Lubrication

Frequently Asked Questions: 2004 Freightliner FS65 Cummins ISB Remanufactured Engine

What Our Customers Say

Warranty & Quality Assurance

Why US Engine Production?

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