Jeep 258 Engine Specs
The Jeep 258 engine is a well-known inline-six engine that has been a staple in various Jeep models since the late 1970s. This engine is revered for its durability and performance, making it a popular choice among off-road enthusiasts and classic Jeep restorers alike. Below are the detailed specifications of the Jeep 258 engine.
| Specification | Details |
|---|---|
| Engine Type | Inline 6-cylinder |
| Displacement | 4.2 liters (258 cubic inches) |
| Bore x Stroke | 3.75 in x 3.88 in (95.25 mm x 98.55 mm) |
| Compression Ratio | 7.4:1 (varies slightly by model year) |
| Horsepower | 112-150 hp (varies by model year) |
| Torque | 210-240 lb-ft (varies by model year) |
| Fuel System | Carbureted (varies by model year) |
| Ignition System | Conventional or electronic (varies by model year) |
| Weight | Approximately 450 lbs (204 kg) |
Engine Configuration
The Jeep 258 engine features a robust inline-six configuration, which is known for its smooth operation and balanced power delivery. This engine design contributes to the vehicle’s overall stability and handling, particularly in off-road conditions. Here are some key aspects of the engine configuration:
Key Features
- Inline-six layout: Provides a good balance of power and smoothness.
- Cast iron block and head: Ensures durability and longevity.
- Overhead valve (OHV) design: Simplifies maintenance and enhances performance.
- Single or dual-barrel carburetor: Depending on the model year, this affects fuel delivery and performance.
Applications
The Jeep 258 engine was used in various Jeep models, including:
- Jeep CJ Series (1976-1986)
- Jeep Cherokee (XJ) (1984-1986)
- Jeep Wagoneer (SJ) (1976-1986)
- Jeep Comanche (MJ) (1986-1992)
Engine Oil Specs & Service Intervals
Proper maintenance of the Jeep 258 engine includes regular oil changes and using the correct type of engine oil. Below are the recommended oil specifications and service intervals.
Engine Oil Specifications
| Specification | Details |
|---|---|
| Oil Type | SAE 10W-30 or 10W-40 (varies by climate) |
| Oil Capacity | Approximately 5 quarts (with filter) |
| Oil Filter | Standard oil filter (specific part number varies by model year) |
Service Intervals
Regular maintenance is crucial for the longevity of the Jeep 258 engine. Below are the recommended service intervals for oil changes and general maintenance:
- Oil Change Interval: Every 3,000 to 5,000 miles or every 3 to 6 months, whichever comes first.
- Oil Filter Change: Replace with every oil change.
- General Inspection: Every 6 months or 6,000 miles, including checking fluid levels, belts, and hoses.
- Valve Adjustment: Every 15,000 miles (if applicable).
Conclusion
The Jeep 258 engine remains a popular choice due to its reliability, performance, and ease of maintenance. Understanding its specifications, configuration, and maintenance requirements is essential for any Jeep owner or enthusiast. By adhering to the recommended oil specifications and service intervals, you can ensure that your Jeep 258 engine continues to perform at its best for years to come. Whether you’re navigating rugged terrains or cruising on highways, this engine is built to deliver a dependable driving experience.
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