1987 Jeep Wrangler Engine For Sale: A Comprehensive Guide to Finding Your YJ’s Heartbeat

1987 Jeep Wrangler Engine For Sale: A Comprehensive Guide to Finding Your YJ’s Heartbeat jeeps.truckstrend.com

The 1987 Jeep Wrangler YJ holds a special place in the hearts of off-road enthusiasts and classic vehicle collectors alike. As the inaugural year for the iconic square-headlight Wrangler, the ’87 model combines rugged utility with a burgeoning sense of everyday usability, setting the stage for decades of Jeep supremacy. For owners of these venerable machines, or those embarking on a restoration project, the quest for a "1987 Jeep Wrangler engine for sale" isn’t just about finding a part; it’s about resurrecting a legend, ensuring years of future adventures, or even upgrading for enhanced performance.

Whether your current engine has finally given up the ghost, you’re restoring a barn find to its former glory, or you’re planning a performance-oriented swap, understanding the nuances of the 1987 Wrangler’s engine options and the marketplace for them is crucial. This comprehensive guide will navigate you through everything you need to know about acquiring an engine for your beloved ’87 YJ, from identifying the right type to understanding market prices and installation considerations.

1987 Jeep Wrangler Engine For Sale: A Comprehensive Guide to Finding Your YJ’s Heartbeat

Understanding the 1987 Jeep Wrangler Engine Landscape

The 1987 Jeep Wrangler YJ came equipped with two primary engine choices, each offering distinct characteristics:

1. The 2.5L AMC 150 Inline-4 (I4): This was the standard engine, offering a balance of fuel economy and adequate power for light off-roading and daily driving. It featured Throttle Body Injection (TBI), making it relatively simple and reliable for its time.

   • Characteristics: Known for its robustness, decent low-end torque, and ease of maintenance. It’s not a powerhouse, but it’s a dependable workhorse.
   • Pros: Good fuel efficiency (for a Jeep), straightforward mechanics, ample parts availability.

   

   • Cons: Limited horsepower (approx. 117 hp) and torque (approx. 135 lb-ft), which can feel underpowered for highway driving or heavier off-road demands.

2. The 4.2L AMC 258 Inline-6 (I6): This was the optional, more powerful engine, a direct descendant of the legendary "258" or "4.2-liter" that had powered CJs for years. In 1987, it primarily came with a problematic Carter BBD carburetor, though many owners have since converted them to TBI or multi-port fuel injection (MPI) systems for improved reliability and performance.

   

   • Characteristics: Renowned for its immense low-end torque (approx. 210 lb-ft), making it excellent for crawling and heavy hauling.
   • Pros: Torquey, durable, highly adaptable for performance upgrades (especially with fuel injection conversions), distinct classic inline-six sound.
   • Cons: The factory Carter carburetor was notoriously finicky, leading to poor fuel economy, idle issues, and starting problems. Its age also means potential for wear in key areas if not properly maintained.

   

When searching for a 1987 Jeep Wrangler engine, identifying which of these two you need – or which you desire for a swap – is your first critical step.

Why Buy a 1987 Jeep Wrangler Engine? Benefits & Scenarios

The reasons for seeking an engine for your ’87 YJ are varied, each presenting its own set of benefits:

• Restoration & Authenticity: For collectors, finding an original-spec engine is paramount to maintaining the vehicle’s historical value and authenticity. A period-correct engine ensures your YJ remains true to its roots.
• Direct Replacement: If your existing engine has suffered a catastrophic failure (e.g., thrown rod, cracked block), a replacement engine is often the most cost-effective and straightforward path to getting your Jeep back on the road.
• Performance Upgrade/Downgrade:
  • Upgrade (2.5L to 4.2L): Swapping from the I4 to the I6 significantly boosts low-end torque, ideal for more demanding off-road trails or if you’re running larger tires.
  • "Downgrade" (4.2L to 2.5L): While less common, some owners might consider this for better fuel economy or simpler mechanics, especially if their 4.2L carb is a persistent headache and they don’t need the extra power.
• Project Vehicle Foundation: Many enthusiasts purchase an ’87 YJ as a project. A solid engine is the heart of any build, whether it’s a full custom rig, a rock crawler, or an overland vehicle.
• Pre-emptive Maintenance: Sometimes, an engine might still be running but showing signs of severe wear. Replacing it before complete failure can save you from being stranded and potentially reduce overall repair costs.

Where to Find a 1987 Jeep Wrangler Engine For Sale

Locating the right engine requires a multi-pronged approach, exploring various channels:

• Online Marketplaces:
  • eBay: A vast selection of new, used, rebuilt, and remanufactured engines from various sellers. Be sure to scrutinize seller ratings and read descriptions carefully.
  • Craigslist/Facebook Marketplace: Excellent for finding local private sellers, often allowing for in-person inspection. Be wary of scams and always meet in a safe, public place.
  • Dedicated Jeep Forums (e.g., JeepForum.com, WranglerForum.com): Many enthusiasts sell parts they’ve pulled or upgraded from their own vehicles. These communities can also offer valuable advice and leads.
• Salvage Yards / Junkyards: Local and specialized auto recyclers often have complete donor vehicles. Call ahead to inquire about specific years and models. Prices are typically lower, but condition can vary widely.
• Specialty Engine Suppliers / Remanufacturers: Companies that specialize in rebuilt or remanufactured engines offer a higher-quality product, often with warranties. These engines are typically more expensive but come with greater peace of mind. Examples include Jasper Engines & Transmissions, ATK Engines, or local engine rebuild shops.
• Private Mechanics & Custom Shops: Some shops that specialize in Jeep restoration or customization may have engines they’ve pulled from customer vehicles or have connections to sources.

Key Considerations When Buying a 1987 Jeep Wrangler Engine

Purchasing an engine is a significant investment. Consider these factors before making a commitment:

1. Engine Condition:
   • Used (Core): An engine sold "as-is" for rebuilding. Expect it to be non-running and require significant work. Cheapest option.
   • Used (Running Pull): An engine removed from a running vehicle. This is often a gamble; ask for video proof of it running, compression test results, and oil pressure readings.
   • Rebuilt: An engine that has been disassembled, inspected, and had worn components replaced (e.g., new bearings, rings, gaskets). Usually done by a local machine shop.
   • Remanufactured: A more comprehensive process than rebuilding. The engine is completely disassembled, machined to original specifications, and all wear parts are replaced. Often comes with a warranty. Most expensive, but highest quality.
   • Crate Engine: A brand-new engine, typically not available for 1987 models unless it’s a modern swap engine.
2. Mileage & History (for Used Engines): Lower mileage is generally better. Ask about the donor vehicle’s history, maintenance records, and why the engine was pulled.
3. Completeness:
   • Long Block: Includes the block, crankshaft, connecting rods, pistons, camshaft, and cylinder head(s). Does not include accessories.
   • Short Block: Includes the block, crankshaft, connecting rods, and pistons. No cylinder head.
   • Complete Engine: Includes the long block plus intake manifold, exhaust manifold, carburetor/throttle body, distributor, alternator, power steering pump, and sometimes the fan, wiring harness, and ECU (if applicable). A more complete engine simplifies installation but costs more.
4. Compatibility: Ensure the engine matches your vehicle’s specifications, especially regarding transmission bolt patterns (the 2.5L and 4.2L typically use different bell housings, though adapters exist for some transmissions).
5. Inspection:
   • Visual: Look for signs of leaks (oil, coolant), cracks in the block or head, broken mounts, or missing components.
   • Compression Test (if possible): For used running engines, good compression across all cylinders is vital.
   • Oil Condition: Check the oil for milky appearance (coolant contamination) or metallic flakes.
6. Warranty: If purchasing a rebuilt or remanufactured engine, inquire about the warranty period, what it covers, and the return process. For used engines, assume "as-is" unless explicitly stated otherwise.
7. Shipping & Logistics: Engines are heavy! Factor in shipping costs, which can be substantial. Ensure the seller can properly crate and ship the engine securely. Local pick-up is often ideal.

Installation & Potential Challenges

Once you’ve secured your engine, the installation process begins.

• DIY vs. Professional: Swapping an engine is a complex task requiring specialized tools, mechanical knowledge, and often a hoist. If you’re not an experienced mechanic, consider professional installation to avoid costly mistakes.
• Engine Swap Challenges (2.5L to 4.2L or vice-versa):
  • Motor Mounts: Different engines require different motor mounts and potentially new frame brackets.
  • Transmission Compatibility: As mentioned, bell housings can differ. You might need an adapter, a new transmission, or a different input shaft.
  • Wiring Harness: The wiring for the 2.5L TBI is different from the 4.2L’s carburetor setup. If converting the 4.2L to TBI or MPI, a new wiring harness and ECU will be necessary.
  • Fuel System: The 4.2L carb uses a low-pressure mechanical fuel pump, while the 2.5L TBI requires a high-pressure electric pump. Swaps will necessitate fuel line and pump changes.
  • Radiator/Cooling: The 4.2L generates more heat and typically requires a larger, more efficient radiator.
  • Exhaust System: Exhaust manifolds and downpipes will differ between the two engines.
• Ancillary Components: Don’t forget to budget for new fluids, belts, hoses, spark plugs, wires, and potentially a new clutch kit if you have a manual transmission.

Tips for a Successful Purchase

1. Do Your Homework: Research the specific engine type thoroughly.
2. Ask Questions: Don’t be shy. The more information you have, the better.
3. Request Documentation: Ask for photos, videos of it running (if used), and any maintenance records.
4. Pre-Purchase Inspection: If buying locally, arrange for a mechanic to inspect the engine.
5. Negotiate: Always try to negotiate the price, especially for used engines.
6. Understand the Return Policy: Know what your options are if the engine isn’t as described.

1987 Jeep Wrangler Engine Price Table (Estimated)

Please note these are estimated prices and can vary significantly based on condition, completeness, seller, location, and market demand. Shipping costs are extra.

Engine Type	Condition	Typical Price Range (USD)	Notes
2.5L AMC 150 I4	Used (Core)	$200 – $500	Requires full rebuild; may have seized components or damage.
	Used (Running Pull)	$500 – $1,200	Varies widely based on mileage, verifiable condition, and completeness. No warranty typically.
	Rebuilt	$1,500 – $2,500	Professionally rebuilt; may or may not include accessories. Limited warranty common.
	Remanufactured	$2,000 – $3,500	Fully machined to spec, new components, often with a good warranty. May or may not include accessories.
4.2L AMC 258 I6	Used (Core)	$300 – $700	Requires full rebuild; often includes the problematic original carburetor.
	Used (Running Pull)	$700 – $1,800	Check for carburetor issues. Higher end for cleaner, lower-mileage examples. No warranty.
	Rebuilt	$2,000 – $3,500	Professionally rebuilt. Often sold as long block. Consider a TBI conversion kit alongside.
	Remanufactured	$3,000 – $4,500	Highest quality, comes with warranty. Often sold as long block. Best option for long-term reliability.

Frequently Asked Questions (FAQ)

Q: What’s the main difference between the 2.5L and 4.2L engines for the 1987 YJ?
A: The 2.5L is a 4-cylinder with TBI, offering better fuel economy but less power. The 4.2L is a 6-cylinder (inline-six) known for its strong low-end torque, but the 1987 model typically came with a problematic carburetor, which many owners convert to fuel injection.

Q: Can I put a 4.0L engine in my 1987 YJ?
A: Yes, a 4.0L High Output (HO) engine (found in later YJs and TJs) is a popular and relatively straightforward swap for the 4.2L. It offers more power, better fuel injection, and shares the same basic block design, making the swap less complex than a V8. It still requires changes to the wiring, ECU, and potentially the fuel system.

Q: What should I look for when inspecting a used engine?
A: Look for signs of major oil or coolant leaks, cracked blocks or cylinder heads, excessive rust, or obvious damage. If possible, perform a compression test, check oil for contaminants, and ensure the engine turns over smoothly.

Q: Is it better to buy a rebuilt or used engine?
A: A rebuilt or remanufactured engine offers greater reliability and often comes with a warranty, making it the safer long-term investment. A used engine is cheaper but carries more risk; it’s best for budget builds or if you’re comfortable with potential additional repairs.

Q: How much does it cost to ship an engine?
A: Shipping an engine typically costs between $200-$500 within the contiguous U.S., depending on distance, carrier, and whether it’s shipped to a commercial or residential address. Crating costs may be extra.

Q: Do I need a new transmission when swapping engines?
A: Not necessarily, but it depends on the swap. If you’re going from a 2.5L to a 4.2L (or vice versa), the transmission bell housing bolt patterns are different. You’ll likely need an adapter plate, or to swap the transmission as well. If staying with the same engine type, your existing transmission will usually bolt right up.

Conclusion

Finding the right "1987 Jeep Wrangler engine for sale" is a critical step in preserving or enhancing your YJ’s legacy. Whether you opt for a faithful restoration with a period-correct 2.5L or 4.2L, or choose a more modern swap like the 4.0L for improved performance, careful research, diligent inspection, and a clear understanding of your needs are paramount. The journey to giving your YJ a new heart can be challenging, but the reward of hearing that engine roar to life, ready for another generation of adventures, is truly priceless for any Jeep enthusiast.