
Remanufactured Crate Engine for 1991 Jeep with 4.0L L6
- Remanufactured Crate Engine
- 1991 Jeep Cherokee, Comanche, Wagoneer
- L6 4.0L
ATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.Please CLICK HERE for ATK Core Return Process
Notes:
- VIN S
- Head Cast #: 7119, 7120
- Block Cast #: 405
- Rear crank pilot hole is 3/4" deep
- 12 valves
Engine Break-In Procedure
Use conventional or break-in oil (non-synthetic) for the first 600 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. Check the engine oil and coolant levels daily.
At 600 Miles change the engine oil and filter using conventional (non-synthetic) oil. Check fuel and ignition settings; adjust valves (where applicable).
After the first 5,000 of service synthetic engine oil may be used. Follow your vehicle owner’s manual for service intervals.
- 36 month/unlimited mileage warranty for gasoline engines
ATK builds remanufactured crate engines with a higher quality than new. Every engine is reverse engineered, allowing ATK to find and remove any factory original defect. This attention to detail and quality will save you time and money by keeping your AMC or Jeep out of the shop and on the road. Engines are factory checked after assembly to ensure proper operation.
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Remanufactured crate engines are built to OE horsepower and torque specifications.
ATK Remanufactured Crate Engines Warranty
Restore your AMC or Jeep vehicle's performance with confidence using ATK Remanufactured Crate Engines. Engineered with precision and backed by decades of expertise, these engines are meticulously remanufactured to meet or exceed OEM specifications. Whether you're tackling rugged trails or commuting through city streets, ATK's reliable craftsmanship ensures long-term performance and durability.
Each engine undergoes a rigorous remanufacturing process, including complete disassembly, inspection, machining, and replacement of critical components. The result is a like-new engine that delivers smooth, efficient power and enhanced longevity. ATK's attention to detail helps eliminate common engine issues, making it an ideal solution for those seeking quality and peace of mind.
Perfect for restoration projects or replacing a worn-out powerplant, ATK offers options tailored to various AMC and Jeep models. Looking to revive an older model with dependable power? The jeep 4 liter crate engine delivers exactly that with updated components and factory-quality performance.
With nationwide shipping and a solid warranty, ATK makes it easy to get your vehicle back on the road without compromise. Whether you're seeking a reliable 4.0 L Jeep motor or simply want to maintain your vehicle's original integrity, these engines are a smart investment in long-term performance.
Trust in ATK Remanufactured Crate Engines to bring your ride back to life—dependable, tested, and ready for the next adventure. Find the right Jeep 4 liter crate engine today and experience the power of precision engineering.
![Break-In/Engine Oil Supplement [12 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28060.jpg)
![Blue RTV, Temperature Resistant up to 500 degrees [3 oz. Tube]](https://www.jegs.com/images/mini_200/500/555/555-28030.jpg)
![Engine Stand [1000 lb. Capacity]](https://www.jegs.com/images/mini_200/500/555/555-80040.jpg)
![Engine Assembly Lube [4 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28000.jpg)