1998 Jeep Cherokee XJ 4.0L Engine for Sale | OEM Used HO Era Inline-6 from 1998 XJ Donor
$1,225.00
At a Glance
- Condition: OEM used, 1998 XJ donor sourced
- Availability: In stock, 1998 XJ donor sourced engine only
- Shipping: Free shipping to all 50 states via freight pallet, 5 to 10 business days
- Engine only (not the complete vehicle)
- 1998-specific donor (HO era, OBD-II compliant)
- Cylinder head casting code 7120 (pre-0331 era, lower crack risk)
- Compatible with all 1996 to 2001 XJ, Wrangler TJ, Grand Cherokee ZJ
- 100% fitment verified before every order ships
- No core charge required
- Backed by a 15 day replacement warranty against manufacturing defects
Description
About the 1998 Jeep Cherokee XJ 4.0L Engine
Experience the power and performance of the 1998 Jeep Cherokee Classic XJ 4×4 4.0L Engine at a budget-friendly price point. This robust engine is sourced from a 1998 XJ donor vehicle and is designed to deliver exceptional off-road capabilities, making it the perfect choice for adventure seekers, XJ restorers, and outdoor enthusiasts. With its 190 hp and 225 lb-ft of torque, this engine ensures a smooth and powerful ride for trail use, daily driving, and light hauling.
Important Note: This listing is for the engine only, not the complete 1998 Jeep Cherokee vehicle. The page title references the “1998 XJ” because the engine is sourced specifically from a 1998 XJ donor, providing the exact-year match desirable for 1998 XJ repower projects.
1998 Jeep Cherokee XJ 4.0L Engine Specifics
The 1998 Jeep Cherokee Classic XJ 4×4 4.0L Engine is a high-performance Inline-6 cylinder engine. It boasts a displacement of 4.0 liters (242 cu in) and 190 horsepower at 4,600 RPM. The engine features a cast iron block and cast iron cylinder head, with sequential multi-port fuel injection (MPFI). Originally paired with the AW4 4-speed automatic transmission in most 1998 XJ Cherokees, this engine spent its life in 4×4 service.
Why a 1998 Donor Specifically
The 1998 model year of the Jeep Cherokee XJ falls within the “sweet spot” of HO 4.0 production:
- OBD-II compliant (1996-plus engines required for OBD-II diagnostic compatibility)
- Pre-0331 head casting (the 0331 problematic head emerged in 2000-2001; 1998 used the earlier 7120 casting which is significantly more crack-resistant)
- Refined HO architecture (the HO platform had been mature since 1991, all early-issue refinements done by 1998)
- Pre-electronic-throttle (still uses simpler mechanical throttle linkage)
- Strong aftermarket support (1998 is in the heart of the XJ enthusiast era)
Compatible Vehicles
This 1998-sourced 4.0L Engine is specifically suited for the 1998 Jeep Cherokee Classic XJ, but cross-fits other applications with similar specifications:
- Jeep Cherokee XJ: 1996 to 2001 (OBD-II era, direct cross-fit)
- Jeep Wrangler TJ: 1997 to 2006 (different intake manifold orientation, easily swapped)
- Jeep Grand Cherokee ZJ: 1996 to 1998 (OBD-II era ZJ)
- Jeep Grand Cherokee WJ: 1999 to 2004 (with appropriate ECU calibration)
Please verify your year and model before purchasing. Cross-installation between Renix-era (1987-1990) and HO-era (1991-plus) requires harness and ECU changes; this 1998-sourced engine is HO-era and compatible with HO-era applications only.
Key Features
The 1998 Jeep Cherokee Classic XJ 4×4 4.0L Engine is renowned for its durability and reliability. Key features include:
1. High-Performance: With 190 horsepower and 225 lb-ft of torque, this engine delivers solid performance suitable for off-road driving, daily use, and light towing. The torque-rich character makes it ideal for low-speed crawling and trail work.
2. Fuel Efficiency: Despite its 4.0L displacement, the engine is designed to be reasonably fuel-efficient, making it a cost-effective choice for long-term ownership. 1998 XJ Cherokee with 4.0 typically delivers 16 to 19 mpg city / 20 to 23 mpg highway.
3. Durability: The cast iron block and cast iron cylinder head construction contribute to legendary durability. Properly maintained 4.0 engines routinely log 300,000-plus miles. The 1998 vintage uses the earlier 7120 head casting that pre-dates the 0331 casting crack issue.
4. Off-Road Capabilities: Originally installed in a 4×4 1998 XJ Cherokee, this engine has the performance characteristics ideal for off-road adventures. The torque-rich Inline-6 character is exactly what is needed for rock crawling, trail driving, and overland use.
5. Easy Installation: Designed to fit seamlessly into any 1996-2001 XJ Cherokee, with cross-fit potential to TJ Wrangler and ZJ Grand Cherokee with appropriate intake manifold orientation. This makes it a convenient choice for vehicle owners doing direct repower or modest swap projects.
6. Pre-0331 Head Casting Advantage: The 1998 vintage uses the earlier 7120 cylinder head casting, predating the 0331 casting that became known for cracking issues in 2000-2001 production. This is a meaningful selection criterion for buyers wanting reduced long-term head-crack risk.
Use Cases
This 1998 XJ 4.0 engine is ideal for:
- 1998 XJ Cherokee owners wanting an exact-year repower for their original Cherokee
- HO-era 4.0 builders seeking the 7120 head casting to avoid the 0331 crack issue
- Wrangler TJ / Grand Cherokee ZJ owners doing budget repowers with the cross-fit 1998 engine
- Off-road builders sourcing a known-good HO 4.0 starting point at a budget price
- Restoration projects requiring period-correct 1998-vintage hardware
Comparison: Year-Specific Donor vs Multi-Year Main Listing
| Option | Description |
|---|---|
| This Listing ($800) | Main Jeep 4.0 Listing ($1,999) |
| 1998 XJ donor specifically | Multi-year (1991 to 2006) availability |
| Lower price point ($800) | Premium price ($1,999) |
| 7120 head casting (pre-0331) | Variable casting based on year selected |
| Engine-only listing, basic inspection | Full compression test, comprehensive inspection paperwork |
| Best for: 1998 exact-match repower, budget builds | Best for: Detailed-spec buyers, comprehensive documentation needs |
Drive 1998 XJ Vintage Energy
Experience the thrill of off-road driving with the 1998 Jeep Cherokee Classic XJ 4×4 4.0L Engine Motor. Its power, performance, and durability make it a valuable addition to your XJ, ensuring an unforgettable driving experience characteristic of Jeep legendary “Immortal Six.”
What Ships and What Does Not
| Item | Details |
|---|---|
| INCLUDED | Engine assembly: cast iron block, crank, rods, pistons, camshaft and lifters, cast iron cylinder head with 7120 casting, valve train, oil pan, valve cover, intake manifold (typical), exhaust manifold (typical). |
| NOT INCLUDED | ECU and harness (sold separately, must be 1996-2001 OBD-II compatible), throttle body, alternator, starter, A/C compressor, power steering pump, water pump, thermostat, flexplate (auto) or flywheel (manual), motor mounts, distributor, complete vehicle (this is engine only, not the complete 1998 Cherokee). |
| Fluids | Drained before shipping. Refill with 10W-30 motor oil. Regular unleaded 87 octane fuel acceptable. |
| Core Note | No core charge. You are not required to return your old engine. |
Vehicle Compatibility
This 1998-sourced 4.0L engine fits the following vehicles:
| Vehicle | Compatibility |
|---|---|
| Jeep Cherokee XJ (1996 to 2001) | Direct OBD-II fit, exact-year match for 1998 XJ |
| Jeep Wrangler TJ (1997 to 2006) | Cross-fit with appropriate intake manifold orientation |
| Jeep Grand Cherokee ZJ (1996 to 1998) | OBD-II era, cross-fit with appropriate harness |
| Jeep Grand Cherokee WJ (1999 to 2004) | Cross-fit with appropriate ECU calibration |
NOT compatible without significant modification: pre-1996 vehicles (Renix era), vehicles with different transmission interface, non-Jeep applications.
Inspection Workflow
This 1998 XJ 4.0 engine is sourced from a vintage 1998 Cherokee donor and inspected before shipping:
- Visual inspection of block, head, and oil galleries
- Cylinder head casting code documented (7120 era, pre-0331 problematic casting)
- 1998 donor authentication via casting numbers and head stamp
- Visible damage and disclosed cosmetic condition documented
- Donor application photographed (1998 XJ origin)
This is positioned as a vintage donor variant rather than a fully-documented and compression-tested premium core. For complete inspection paperwork including compression results across all 6 cylinders, see our Jeep Cherokee 4.0 Engine for Sale at $1,999.
Why Buy From Part Nests
- 1998 XJ donor sourced for exact-year match
- 7120 head casting documented (pre-0331 era, lower crack risk)
- Visual inspection completed before shipping
- Cross-link to comprehensive main listing for buyers wanting full inspection paperwork
- Free freight pallet to all 50 states, no hidden fees
- No core charge, keep your old engine
- 15 day replacement warranty on manufacturing defects
- Call (240) 306-7051 to confirm 1998-vintage donor sourcing, 7120 head casting, and HO-era ECU compatibility before ordering
15 Day Replacement Warranty
Every 1998 XJ 4.0 engine purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Manufacturing defects already present when the engine arrives
- Visible damage beyond what was disclosed at shipping
- Cylinder head crack failures not disclosed at shipping (the 7120 casting is significantly less crack-prone than 0331, but inspected and disclosed openly)
- Incorrect donor variant shipped (non-1998-vintage or non-7120-casting engine sent) due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from operating with neglected cooling system (the 4.0 is sensitive to cooling system condition; replace thermostat and water pump at install if condition unknown)
- Damage from running with incorrect ECU calibration (this engine is HO-era OBD-II; pre-1996 Renix electrical systems are not compatible)
- Damage from extended oil change intervals or incorrect oil viscosity (Jeep-spec 10W-30 recommended)
- Compression performance beyond what is typical for a budget-tier vintage donor unit (for comprehensive compression-tested coverage, see main listing)
- External components (ECU, harness, throttle body, alternator, starter, A/C, P/S, water pump, thermostat, flexplate, motor mounts, distributor) unless itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- 1998 XJ Donor Sourced: Exact-year match for 1998 XJ repower projects
- 7120 Head Casting: Pre-0331 era, lower long-term crack risk
- HO-Era OBD-II Compliant: Compatible with 1996-2001 XJ, TJ, ZJ chassis
- Visual Inspection Completed: Block, head, oil galleries assessed
- Cross-Link to Comprehensive Main Listing: at $1,999 for full inspection paperwork
- 15 Day Replacement Cover: Manufacturing defects protected from delivery onward
Additional information
| engine-type | Inline-6 (I6) |
|---|---|
| displacement | 4.0 liters (242 cu in) |
| horsepower | 190 hp at 4, 600 rpm |
| torque | 225 lb-ft at 3, 000 rpm |
| block-material | Cast iron |
| head-material | Cast iron |
| head-casting-code | 7120 era (pre-0331) |
| valve-train | OHV (Overhead Valve, pushrod) |
| fuel-system | Multi-port Fuel Injection (MPFI) |
| era | HO (High Output), OBD-II compliant |
| donor-year | 1998 |
| donor-model | Jeep Cherokee XJ Classic |
| drivetrain-donor | 4×4 |
| compatibility | 1996 to 2001 XJ, 1997 to 2006 TJ, 1996 to 1998 ZJ, 1999 to 2004 WJ |
| price | $800.00 |
| Brand | Jeep |
No. This listing is for the engine only. The page title references "1998 Jeep Cherokee XJ 4.0L Engine" because the engine is sourced from a 1998 XJ donor vehicle. The complete vehicle is not part of this listing. You are buying the 4.0L inline-6 engine assembly (long block plus typical intake and exhaust manifolds) sourced from a 1998 XJ Cherokee donor.
Sweet-spot HO 4.0 production with the 7120 head casting. The 1998 model year sits in the heart of the OBD-II-era HO 4.0 production: OBD-II compliant (required for 1996-plus diagnostic compatibility), pre-0331 head casting (uses the earlier 7120 casting which is significantly less crack-prone than the 2000-2001 0331), refined HO architecture (all early-issue 1991-1992 refinements completed), pre-electronic-throttle (simpler mechanical linkage), and in the heart of the XJ enthusiast era for maximum aftermarket support. For 1998 XJ owners specifically, a 1998-vintage donor provides the exact-year match.
Inspection depth, variant flexibility, and price tier. This listing (at $800) is positioned as a budget-tier vintage donor: sourced specifically from a 1998 XJ, with the 7120 head casting documented, visual inspection completed, but without the comprehensive compression-test paperwork of the main listing. The main Jeep Cherokee 4.0 Engine listing (at $1,999) is a premium core with full compression test results across all 6 cylinders, comprehensive variant identification (Renix vs HO vs Chrysler era), full inspection workflow including head crack pressure testing, and multi-year donor sourcing flexibility. For buyers wanting an exact-1998 match at the lowest price, this listing is the right choice. For buyers wanting comprehensive inspection documentation, see.
An early HO-era cylinder head casting that pre-dates the 0331 crack issue. The 7120 casting was used on Jeep 4.0 HO engines through the mid-1990s into 1999 production. It is significantly more reliable than the later 0331 casting that became known for cracking between cylinders 3 and 4 on 2000-2001 production engines. The 7120 casting is one of the most reliable Jeep 4.0 cylinder head castings produced. We confirm the 7120 casting on every 1998-donor-sourced engine before shipping.
Yes with cross-fit considerations. The 1998-sourced 4.0 engine is HO-era OBD-II compliant, making it cross-compatible with 1996-2001 XJ Cherokee (direct fit), 1997-2006 Wrangler TJ (different intake manifold orientation; easily swapped using TJ-specific intake), 1996-1998 Grand Cherokee ZJ (OBD-II era ZJ, cross-fit with appropriate harness), and 1999-2004 Grand Cherokee WJ (with appropriate ECU calibration). For TJ Wrangler installation, you'll typically need to swap to the TJ-specific intake manifold for proper hood clearance and throttle body orientation. We can advise on cross-fit details when you order.
Engine assembly including cast iron block, cast iron cylinder head with 7120 casting, crank, rods, pistons, camshaft and lifters, valve train, oil pan, valve cover, intake manifold (typical), and exhaust manifold (typical). NOT included: ECU and harness (sold separately, must be 1996-2001 OBD-II compatible), throttle body, alternator, starter, A/C compressor, power steering pump, water pump, thermostat, flexplate or flywheel, motor mounts, distributor, and the complete 1998 Cherokee vehicle (this is engine only).
Different inspection tier and intended buyer. This listing at $800 is positioned for budget-conscious buyers who want the 1998-vintage donor specifically and the 7120 head casting advantage, with a basic visual inspection level. The main listing at $1,999 is positioned for buyers who want the comprehensive compression test results across all 6 cylinders, head crack pressure testing, full variant identification, and detailed inspection paperwork. Both are legitimate listings; the choice depends on what level of inspection documentation you need and your budget.
No. There is no core return required.
2 reviews for 1998 Jeep Cherokee XJ 4.0L Engine for Sale | OEM Used HO Era Inline-6 from 1998 XJ Donor
Related products
Wesley P. –
Got the 1998 XJ-sourced 4.0 for an exact-year match on a 1998 XJ Cherokee repower. 7120 head casting confirmed (not the problematic 0331), HO-era OBD-II compliance verified, donor application photographed. Cross-link to the main vaz69 listing was clearly explained — appreciated knowing the difference between the budget tier and the comprehensive tier before deciding which to buy.
Rhea D. –
Sourced this 1998 XJ 4.0 for a Wrangler TJ budget repower. 7120 head casting documented, visual inspection completed, donor application identified. Honest pre-purchase information about the engine-only nature of the listing (not the complete vehicle) and the difference between this budget tier and the comprehensive vaz69 tier. Foundation for the TJ build at the right price point.