Is there any engine more legendary than the Jeep 4.0-liter inline-six? Known for its iron-clad reliability and endless torque, this power plant turned the Cherokee and Wrangler into off-road icons. Even decades later, enthusiasts still hunt for ways to keep these beasts running forever. However, when your original block finally gives out, finding a high-quality replacement is not as simple as it used to be.
Choosing a Jeep 4.0 crate engine feels like a minefield. You have to navigate confusing shipping costs, mysterious warranty claims, and rebuilt units that might not meet factory standards. Many shops promise “like-new” performance, but not every engine is built with the same care. The wrong choice could lead to oil leaks, overheating, or a total breakdown deep on the trail. You deserve an engine that respects the history of your Jeep while providing the muscle you need for your next adventure.
In this guide, we cut through the noise to help you find the perfect match for your rig. We will break down the differences between remanufactured and rebuilt options and highlight the red flags to watch for before you pull out your wallet. By the end of this post, you will know exactly how to spot a reliable build that keeps your Jeep on the road for years to come. Let’s dive into everything you need to know about upgrading your 4.0 heart.
Top Jeep 4.0 Crate Engine Recommendations
- Fitment: This Starter Motor fits For:-Jeep Grand Cherokee 1993-1998 4.0L/ 1987-1998 Cherokee 4.0L/ 1987-1992 Comanche/ 1988-1991 Grand Wagoneer 5.9L/ 1988 J10 5.9L/ 1988 J20 5.9L/ 1987-1990 Wagoneer 4.0L/ 1988-1990 Wrangler 4.2L/ 1991-1995 1997-1998 Wrangler 4.0L
- Starter Replacement OEM: The starter replace OE number:17006 ,410-48015, 323-1047, 336-1493, BSR604X, M1T74283, 111349, 33002709, 56027317, 56041012, 56041014
- Product Specifications: Condition: New; Power Rating: 1.6KW; Volts: 12V; Number of Teeth: 9; Rotation: CW
- High Quality: ① Brush Hold: pressed from copper and graphite powder, good electric conductivity, superior anti-resistance; ② Gear Box: reduce speed and increase torque, finely crafted, high stability; ③Electromagnetic Switch: eco-friendly galvanized, uniform color, no spotting; ④Gear: precision machining, long-lasting and durable
- 100% Strict Quality Control: SZKAIDAG Starter undergo strict quality control not just before shipping but throughout the production process. during each step of production multiple quality control checks are performed to meet or exceed oe (original equipment) Starter Motor fit, form, and function and insure each and every part lasts for years to come. This Starter Motor is manufactured by szkaidag industrial with 30 years automotive experience in more than 10 countries
- Fitment: AOTPAT Starter Motor Compatible for:-Jeep Wrangler 1999-2001 L6 4.0L, Wrangler 2002 L6 4.0L(Fit for 1.2 KW/1.6 KW), Cherokee 1999-2001 L6 4.0L, Grand Cherokee 1999-2001 L6 4.0L, Grand Cherokee 2002 L6 4.0L(Fit for 1.2 KW/1.6 KW)
- OEM: 56041012AB, 17749N, 17749R, 111349, 33002709, 56041012, 56041012AE, 56041014, M1T74281, M1T74286
- Perfect Fit: Standardized production makes the size very accurate and ensure insert precise fitment and easy installation
- Professional Testing: Brand new starter made by OEM approved & ISO certified manufacturer. All components are 100% brand new, dimensions, key mounting surfaces and contact points have been measured for higher performance
- Functionally and quality: tested in accordance with the same standards as for original equipment parts For high performance and reliability over a long service life, 9-Year Unlimited-Mileage Warranty
- [ Starter Fitment ] Compatible with 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 for jeep Cherokee 1987 1988 1989 1990 1991 1992 for jeep Comanche 1993 1994 1995 1996 1997 1998 for jeep Grand Cherokee 1988 1989 1990 1991 for jeep Grand Wagoneer 1997 1998 for jeep TJ 1987 1988 1989 1990 for jeep Wagoneer 1988 1989 1990 1991 1992 1993 1994 1995 1997 1998 for jeep Wrangler
- [ Starter for Reference Number ] 17006N 33002709 8933002709 8982775123 JR775123 M1T74281 M1T74283 M1T74286 M1T74481 17006N 33002709 8933002709 8982775123 JR775123 M1T74281 M1T74283 M1T74286 M1T74481 17006N
- [ High Performance ] Automotive replacement starter use premium components and strict quality control standards to ensure superior performance and durability, and every product meets our high quality benchmarks
- [ Specifications & Include ] 1.7kW/12 Volt, CW, 10-Tooth Pinion;1x Starter Motor; Packaging Type: Box
- [ Note ] SCITOO Auto supply starters for most cars, SUVs, trucks and trailers. Please select your vehicle (year/make/model/trim) in the top left corner of the page to confirm compatibility or refer to the vehicle information in the description
- Meets or Exceeds OEM Specifications
- 100% Computer Load Tested for Reliability
- One Year Warranty
The Ultimate Buying Guide: Choosing a Jeep 4.0 Crate Engine
The Jeep 4.0-liter inline-six engine is a legend in the off-road world. Many enthusiasts call it the “bulletproof” engine because it lasts for hundreds of thousands of miles. If your current engine has finally given up, buying a crate engine is a great way to bring your Jeep back to life. This guide helps you choose the right one.
Key Features to Look For
When shopping for a crate engine, look for a “turn-key” setup. This means the engine comes ready to install. Check if the engine includes the intake manifold, exhaust manifold, and the water pump. Some companies also include the engine wiring harness and computer. A complete package saves you hours of work in the garage.
Important Materials
Quality engines use high-grade materials. Look for an engine block made of heavy-duty cast iron. This material handles high heat and stress better than lighter metals. Check that the internal parts, like the pistons and connecting rods, are forged or high-quality cast steel. These parts ensure your engine survives tough trails and daily driving.
Factors That Improve or Reduce Quality
Several factors change the quality of your crate engine. A “remanufactured” engine is often better than a simple used one. Professional shops clean, machine, and rebuild these engines to factory specs. They replace worn parts with new, updated components. Avoid engines that look dirty or have rust on the internal surfaces. A good seller will provide a warranty, which proves they trust their work.
User Experience and Use Cases
The 4.0 engine is perfect for two main groups. First, it is great for the “daily driver” Jeep owner. This engine provides smooth power for highway trips and city driving. Second, it is a favorite for off-roaders. The engine provides lots of low-end torque. This helps you crawl over rocks and climb steep hills with ease. Whether you are driving to work or hitting the trails on the weekend, the 4.0 is a reliable partner.
10 Frequently Asked Questions
Q: Is a crate engine better than a rebuild?
A: A crate engine is usually faster to install. You get a complete, tested unit that is ready to bolt in. Rebuilding your own engine takes much more time and special tools.
Q: What is a long block versus a short block?
A: A short block is just the bottom part of the engine. A long block includes the cylinder head and the valve train. Most people prefer a long block for easier installation.
Q: How long does a 4.0 engine last?
A: With proper oil changes and maintenance, these engines often last over 300,000 miles.
Q: Will this engine fit my Jeep Wrangler?
A: The 4.0 was used in many Jeep models for years. Always check your specific Jeep year and model against the engine specs before buying.
Q: Does the engine come with a warranty?
A: Most reputable companies offer a warranty. This usually covers parts and labor for a specific time or mileage.
Q: Can I install the engine myself?
A: Yes, if you have a shop crane, basic tools, and a service manual. If you feel unsure, a professional mechanic should do the install.
Q: What oil should I use in a new 4.0?
A: Follow the manufacturer’s instructions. Many owners prefer a high-quality 10W-30 oil for these engines.
Q: Do I need to break in the engine?
A: Yes. Follow the “break-in” steps provided by the seller to seat the piston rings correctly.
Q: Does the crate engine come with accessories?
A: It depends on the package. Some come with an alternator and starter, while others do not. Always read the product description carefully.
Q: Is the 4.0 engine fuel efficient?
A: It is not a fuel-sipping engine. However, its reliability and power make up for the fuel usage for most Jeep owners.