Remanufactured Engines, Transmissions & Other Powertrain Components

Fraser Engines sells to the public & commercial auto shops! Phone Hours: Mon-Fri 8AM-5PM EST. Online ordering & Texting support open 24-7!

Speak with a Powertrain Expert Now!

SALE! Use promo code FS-909 to get FREE SHIPPING & pay NO upfront core. Some exclusions apply.
🛒  Online Ordering Available 24/7 📞 Call Us 8AM–5PM Mon–Fri To Place Your Order 🇺🇸 Fraser Engines Is Open To The Public & Repair Centers Use Promo Code FS109 For Free Shipping
🛒  Online Ordering Available 24/7 📞 Call Us 8AM–5PM Mon–Fri To Place Your Order 🇺🇸 Fraser Engines Is Open To The Public & Repair Centers Use Promo Code FS109 For Free Shipping

FRASER ENGINES - 4.0L STRAIGHT SIX JEEP ENGINE

FITS JEEP 4.0 VEHICLES (1980 - 2006)

PLEASE SELECT AN OPTION

Remanufactured JEEP 4.0L Engine (1980–2006)
Zero Mileage | OEM Specification Build | Direct Replacement
$2,399.00
SKU: FEF40JS
✔ No Upfront Core Fee ✔ 3 Year / Unlimited Miles Parts & Labor Warranty
Shipping & Availability
📦 IN STOCK – Limited Inventory
⛟ FREE shipping to commercial address ($125 residential delivery)
🔥 Order before 3PM EST for 2–3 business day delivery*
Included Parts & Warranty
  • Fully remanufactured engine block
  • Remanufactured cylinder heads — pressure tested & resurfaced
  • New pistons, rings, and bearings
  • Timing components
  • Oil pump
  • New gaskets and seals throughout
  • Balanced rotating assembly
Core Policy: This unit requires a returnable core. Fraser Engines will arrange free core pickup at no additional cost.

NO Fault Warranty Options (add them at checkout page if wanted)

What even is a NO FAULT Warranty and why would I need it if the engine already has a warranty for free? –Click to View Standard vs NFW protection breakdown

No-Fault Warranty Options

1-Year No-Fault Warranty

$99.00

  • One-time free replacement, no matter the cause of failure.
  • Unlimited miles during the 1-year term.
  • Labor covered at $50.00/hr (Mitchell or AllData book time).

2-Year No-Fault Warranty

$199.00

  • One-time free replacement within 2 years.
  • Unlimited miles during the term.
  • Labor covered at $50/hr (Mitchell or AllData book time).

3-Year No-Fault Warranty

$299.00

  • One-time free replacement within 3 years.
  • Unlimited miles during the term.
  • Labor covered at $50/hr (Mitchell or AllData book time).

4-Year No-Fault Warranty

$399.00

  • One-time free replacement within 4 years.
  • Unlimited miles during the term.
  • Labor covered at $99/hr (Mitchell or AllData book time).

5-Year No-Fault Elite

$499.00

  • Covers the full 5 years • one-time free replacement.
  • Unlimited miles during the term.
  • Labor covered at $99/hr (Mitchell or AllData book time).

Labor reimbursement uses published Mitchell or AllData times. One-time replacement applies per covered unit during the elected term.

Recommended Goodies to Bundle with your New Engine

$47.99

Fraser Engines Premium Break-In Fluid is specially formulated to protect your new engine during the most critical phase of its life—the initial break-in period. Designed to promote proper ring seating, reduce friction, and prevent premature wear, this high-performance fluid helps ensure maximum longevity, smoother operation, and optimal performance from day one.

Trusted by engine builders and recommended by Fraser technicians, this break-in fluid provides the added protection your investment deserves during startup and early run time—when engine components need it most.

✔ Promotes proper piston ring seating
✔ Reduces initial wear and friction
✔ Helps protect camshafts, lifters, and bearings
✔ Ideal for all newly installed Fraser remanufactured engines

Highly recommended for every new engine installation.

$250.00

Fraser Engines Premium Engine Installation Kit

Fraser Engines’ Premium Engine Installation Kit is designed to streamline your engine replacement while protecting your investment from day one. This all-inclusive kit replaces the most commonly worn supporting components that can affect performance, cooling, and reliability after installation.

Kit Includes:
✅ New drive belts
✅ New radiator and heater hoses
✅ New water pump
✅ New thermostat
✅ New air filter
✅ New oil filter
✅ New spark plugs

Installing new supporting components helps reduce repeat labor, ensure proper cooling, and maximize the lifespan of your new engine.

⚠️ Availability may vary by application.
Please confirm availability during order confirmation to ensure this kit can be added to your purchase.

 

 

FRASER Advantage™ Premium Remanufactured 4.0L JEEP Engine (1980–2006)
Zero Mileage | Better Than OEM Design | All TSB Upgrades Applied | Direct Fitment
$2,999.00
SKU: FEJ40R-HD
✔ No Upfront Core Fee ✔ FRASER Advantage™ Premium Build
FRASER Advantage™ Upgrade: This premium 4.0L Jeep engine is built beyond a standard remanufactured unit. Known factory wear points are corrected, applicable TSB updates are applied, and critical components are updated for improved longevity, oil control, sealing, and long-term reliability.
Shipping & Availability
📦 IN STOCK – Limited Inventory
⛟ FREE shipping to commercial address ($125 residential delivery)
🔥 Order before 3PM EST for 2–3 business day delivery*
Included Parts & Warranty
  • Fully Remanufactured Engine Block — stripped, inspected, precision-machined, and rebuilt to meet or exceed OEM specifications
  • Remanufactured Cylinder Heads — pressure tested and resurfaced for proper sealing, compression, and reliability
  • New Pistons, Rings & Bearings — restores factory clearances while improving durability and oil control
  • All Applicable TSB Updates Applied — known factory issues are corrected during the build
  • Updated Timing Components — helps eliminate timing-related wear and ensures accurate valve timing
  • New Oil Pump — improves oil pressure and lubrication to protect critical engine components
  • New Gaskets & Seals Throughout — prevents leaks and ensures reliable sealing
  • Precision-Balanced Rotating Assembly — delivers smoother operation, reduced vibration, and extended engine life
Core Policy: This unit requires a returnable core. Fraser Engines will arrange free core pickup at no additional cost.

NO Fault Warranty Options (add them at checkout page if wanted)

What even is a NO FAULT Warranty and why would I need it if the engine already has a warranty for free? –Click to View Standard vs NFW protection breakdown

No-Fault Warranty Options

1-Year No-Fault Warranty

$99.00

  • One-time free replacement, no matter the cause of failure.
  • Unlimited miles during the 1-year term.
  • Labor covered at $50.00/hr (Mitchell or AllData book time).

2-Year No-Fault Warranty

$199.00

  • One-time free replacement within 2 years.
  • Unlimited miles during the term.
  • Labor covered at $50/hr (Mitchell or AllData book time).

3-Year No-Fault Warranty

$299.00

  • One-time free replacement within 3 years.
  • Unlimited miles during the term.
  • Labor covered at $50/hr (Mitchell or AllData book time).

4-Year No-Fault Warranty

$399.00

  • One-time free replacement within 4 years.
  • Unlimited miles during the term.
  • Labor covered at $99/hr (Mitchell or AllData book time).

5-Year No-Fault Elite

$499.00

  • Covers the full 5 years • one-time free replacement.
  • Unlimited miles during the term.
  • Labor covered at $99/hr (Mitchell or AllData book time).

Labor reimbursement uses published Mitchell or AllData times. One-time replacement applies per covered unit during the elected term.

Recommended Goodies to Bundle with your New Engine

$47.99

Fraser Engines Premium Break-In Fluid is specially formulated to protect your new engine during the most critical phase of its life—the initial break-in period. Designed to promote proper ring seating, reduce friction, and prevent premature wear, this high-performance fluid helps ensure maximum longevity, smoother operation, and optimal performance from day one.

Trusted by engine builders and recommended by Fraser technicians, this break-in fluid provides the added protection your investment deserves during startup and early run time—when engine components need it most.

✔ Promotes proper piston ring seating
✔ Reduces initial wear and friction
✔ Helps protect camshafts, lifters, and bearings
✔ Ideal for all newly installed Fraser remanufactured engines

Highly recommended for every new engine installation.

$250.00

Fraser Engines Premium Engine Installation Kit

Fraser Engines’ Premium Engine Installation Kit is designed to streamline your engine replacement while protecting your investment from day one. This all-inclusive kit replaces the most commonly worn supporting components that can affect performance, cooling, and reliability after installation.

Kit Includes:
✅ New drive belts
✅ New radiator and heater hoses
✅ New water pump
✅ New thermostat
✅ New air filter
✅ New oil filter
✅ New spark plugs

Installing new supporting components helps reduce repeat labor, ensure proper cooling, and maximize the lifespan of your new engine.

⚠️ Availability may vary by application.
Please confirm availability during order confirmation to ensure this kit can be added to your purchase.

 

 

4.0L Jeep Straight Six Engine Vehicle Fitments (1987–2006)

Year(s) Make Model Engine Code (VIN) Notes
1987–2001JeepCherokee (XJ)VIN S / VIN MRenowned reliability; fuel injected from 1987
1987–1992JeepComanche (MJ)VIN S / VIN MPickup version of Cherokee XJ
1991–2006JeepWrangler (YJ/TJ)VIN SOptional engine; replaced by 4.0L MPI in 1991
1993–2004JeepGrand Cherokee (ZJ/WJ)VIN SBase engine until replaced by 3.7L V6
1987–1990JeepWagoneer (XJ)VIN SCompact Wagoneer variant of Cherokee

4.0L Jeep Engine Replacement – Premium Remanufactured Engines by Fraser Engines

If you're searching for a dependable 4.0L Jeep engine replacement, you're looking at one of the most well-known inline-6 platforms ever installed in Jeep vehicles. The Jeep 4.0L engine is respected for its torque, durability, and long service life, but as mileage climbs, common wear issues involving cylinder heads, oil leaks, cooling problems, and internal component fatigue can make replacement the best long-term solution. At Fraser Engines, we offer a premium remanufactured 4.0L Jeep engine built to restore reliability, performance, and peace of mind.

What is the 4.0L Jeep Engine?

The 4.0L Jeep inline-6 engine became legendary for its simple design, strong low-end torque, and long-term dependability. Used in some of Jeep’s most popular vehicles, the 4.0L engine earned a reputation for lasting well beyond 200,000 miles when properly maintained. However, even durable engines eventually develop wear-related problems that can lead owners to seek a remanufactured 4.0L Jeep engine replacement.

Common 4.0L Jeep Engine Problems

  • Cylinder Head Cracking: Certain 4.0L applications are known for cylinder head cracking and coolant-related issues.
  • Rear Main Seal Leaks: Oil leaks are common on aging 4.0L engines, especially at higher mileage.
  • Valvetrain Wear: Lifters, pushrods, and rocker components can wear over time, causing ticking and reduced performance.
  • Cooling System Stress: Overheating and cooling-related wear can shorten engine life if left uncorrected.
  • Compression Loss: Worn rings, bearings, and other internal components can reduce power and drivability.

These issues are exactly why installing a used or junkyard 4.0L Jeep engine can be risky. Without addressing internal wear and known failure points, the same problems can return.

Why Choose a Fraser Advantage™ 4.0L Jeep Engine?

Our Fraser Advantage™ Premium Remanufactured 4.0L Jeep engines are built to exceed OEM standards. We don’t just replace damaged parts—we correct wear issues, restore proper tolerances, and rebuild the engine for long-term durability.

  • Remanufactured Cylinder Heads – Restores sealing, compression, and long-term reliability
  • Precision-Machined Internal Components – Brings the engine back to proper specifications
  • Updated Sealing Components – Helps reduce future oil and fluid leaks
  • Renewed Valvetrain Components – Improves durability and smooth engine operation
  • New Pistons, Rings, Bearings & Wear Components – Supports long engine life
  • Fully Tested & Quality Inspected – Every engine is verified before shipment

Warranty Protection You Can Trust

Every Fraser 4.0L Jeep engine is backed by a comprehensive warranty, giving you confidence that your investment is protected. Unlike used engines, our remanufactured units are built for long-term reliability, consistent performance, and daily dependability.

Better Than Used or Salvage Engines

A used 4.0L Jeep engine may look like a cheaper option upfront, but it often comes with unknown mileage, hidden internal wear, and the same aging issues that caused your original engine to fail.

Fraser Advantage™ engines are fully remanufactured, updated, and quality-tested, making them the smarter choice for long-term value and reliability.

Vehicle Fitment for 4.0L Jeep Engines

Our 4.0L Jeep engines fit a wide range of vehicles, including:

  • Jeep Cherokee
  • Jeep Grand Cherokee
  • Jeep Wrangler
  • Jeep Comanche

We also offer VIN matching to help ensure proper fitment and eliminate compatibility issues before ordering.

Order Your 4.0L Jeep Engine Today

If your engine has failed or is showing signs of wear, don’t settle for a temporary fix. Upgrade to a Fraser Advantage™ 4.0L Jeep engine and get the reliability, performance, and support your vehicle deserves.

Order today for fast shipping, expert support, and premium remanufactured quality.