Jeep 4.2 Engine Specifications
The Jeep 4.2 engine is a well-regarded powerplant that has been a staple in various Jeep models, particularly during the late 1970s and 1980s. Known for its durability and capability, this inline-six engine has specific characteristics that make it suitable for off-road adventures and daily driving alike.
Engine Overview
The Jeep 4.2 engine, also known as the AMC 4.2L, is a 258 cubic inch (4.2 liters) inline-six engine. It was primarily used in the Jeep CJ series, the Jeep Cherokee, and the Jeep Wagoneer. Below are the detailed specifications of the engine:
| Specification | Details |
|---|---|
| Engine Type | Inline-Six |
| Displacement | 258 cubic inches (4.2 liters) |
| Bore x Stroke | 3.75 in x 3.88 in (95.25 mm x 98.55 mm) |
| Compression Ratio | 7.8:1 |
| Horsepower | 112 hp @ 3,600 rpm |
| Torque | 210 lb-ft @ 2,000 rpm |
| Fuel System | Carbureted |
| Ignition System | Conventional |
| Cooling System | Water-cooled |
Engine Configuration
The configuration of the Jeep 4.2 engine is designed to provide a balance of power and efficiency. The inline-six layout contributes to a smoother operation and better torque delivery, which is particularly beneficial for off-road driving.
Key Features of the Engine Configuration
-Inline-Six Design: This configuration allows for a more compact engine design while providing ample torque.
-Overhead Valve (OHV): The engine utilizes an overhead valve design, which enhances performance and efficiency.
-Single Overhead Camshaft (SOHC): This setup simplifies the engine design and reduces weight, contributing to better fuel economy.
-Cast Iron Block and Head: The durability of cast iron ensures longevity and resistance to wear and tear.
Engine Oil Specifications
Proper lubrication is crucial for the longevity and performance of the Jeep 4.2 engine. The choice of engine oil and adherence to service intervals can significantly impact engine health.
Recommended Engine Oil
-Viscosity: 10W-30 or 10W-40
-Type: Conventional or Synthetic Blend
-API Rating: API SL or higher
Oil Capacity
-With Filter: Approximately 5 quarts (4.73 liters)
-Without Filter: Approximately 4.5 quarts (4.25 liters)
Service Intervals
Regular maintenance is essential to keep the Jeep 4.2 engine running smoothly. The following service intervals are recommended:
Oil Change Intervals
-Every 3,000 to 5,000 miles (4,800 to 8,000 km) depending on driving conditions.
Other Maintenance Tasks
-Air Filter Replacement: Every 15,000 miles (24,000 km)
-Fuel Filter Replacement: Every 20,000 miles (32,000 km)
-Spark Plug Replacement: Every 30,000 miles (48,000 km)
-Coolant Flush: Every 2 years or 30,000 miles (48,000 km)
-Transmission Fluid Change: Every 30,000 miles (48,000 km)
Conclusion
The Jeep 4.2 engine is a robust and reliable powerplant that has stood the test of time. With its inline-six configuration, it offers a blend of power, torque, and durability, making it a favorite among off-road enthusiasts and daily drivers alike. Proper maintenance, including regular oil changes and adherence to service intervals, will ensure that this engine continues to perform optimally for years to come. Understanding the specifications and maintenance requirements is essential for any Jeep owner looking to maximize the lifespan and performance of their vehicle.
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