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If you’re considering buying a used engine, it’s important to know what to look for to avoid any potential problems. A thorough inspection can help you identify any issues before you make your purchase. This video provides valuable tips on what to look for when buying a used engine to ensure it’s in good condition.

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Inline 6 Jeep Motor

The Inline 6 Jeep motor, also known as the straight-six engine, has been a hallmark of Jeep vehicles for decades. It is known for its smooth power delivery, durability, and ease of maintenance. In this article, we will delve into the history of the inline 6 engine, the iconic Jeep inline 6 engines, and the reasons behind the enduring popularity of these powerplants. Let's dive right in.

History of the Inline 6 Engine


The inline 6 engine is an internal combustion engine with six cylinders arranged in a straight line along the engine's crankcase. It is one of the oldest and most widely used engine configurations, dating back to the early 20th century. It was first used in automobiles and later found widespread use in trucks, buses, and other heavy-duty vehicles.


Over the years, the inline 6 engine underwent significant development and refinement over the years, with innovations in materials, fuel injection systems, and electronic engine management systems. This allowed for increased power, efficiency, and reliability, making it a popular choice for both passenger cars and off-road vehicles.

Decline and Revival

The inline-six engine's popularity waned with the rise of more compact V6 and V8 engines in the latter half of the 20th century. However, the inline six has experienced a resurgence in recent years, with many manufacturers reintroducing it into their lineups, thanks to its inherent advantages in smoothness and reliability.

Jeep's Iconic Inline 6

Jeep 4.0L Inline 6


One of Jeep's most iconic inline 6 engines is the 4.0L inline 6, which powered various Jeep models from 1987 to 2006. The engine featured a cast-iron block and cylinder head, a forged steel crankshaft, and hydraulic lifters. Its fuel injection system evolved from a throttle body injection (TBI) to a multi-point fuel injection (MPI) system for improved performance and efficiency.

Performance and Reliability

The Jeep 4.0L inline 6 is renowned for its exceptional reliability, durability, and torque output. It produced between 190 and 205 horsepower and 225 to 240 lb-ft of torque, depending on the specific model and year. Its low-end torque made it ideal for off-roading, while its simplicity and ease of maintenance endeared it to Jeep enthusiasts worldwide.

Jeep 3.6L Pentastar V6

Differences and Improvements

The 3.6L Pentastar V6 engine replaced the 4.0L inline 6 in many Jeep models starting in 2012. It features an aluminum block and cylinder heads, dual overhead camshafts, and a variable valve timing system. The engine produces 285 horsepower and 260 lb-ft of torque, offering increased power and efficiency compared to the older inline 6. While the V6 engine has its merits and has been well-received by Jeep fans, many still reminisce about the smoothness and simplicity of the inline 6 motors.

The Inline 6 Engine's Appeal

Smooth Power Delivery

One of the primary reasons for the inline 6 engine's appeal is its smooth power delivery. With six evenly spaced cylinders in a straight line, the engine experiences less vibration than V-configured engines. This translates to a more refined driving experience and reduced stress on the engine components, contributing to the Inline 6's legendary reliability.

Durability and Longevity

The inline 6 engine's inherent durability and longevity have made it a favorite among automotive enthusiasts. Its simple design, combined with the use of robust materials like cast iron, have allowed many inline 6 engines to exceed 300,000 miles with regular maintenance.

Simplicity and Maintenance

The simplicity of the inline 6 engine design is another significant advantage. With fewer moving parts and a more straightforward layout, it is easier to work on and maintain than many other engine configurations. This simplicity has endeared it to backyard mechanics and off-road enthusiasts, who appreciate the ease of repair and modification.


The inline 6 Jeep motor has left an indelible mark on the automotive world, especially in the realm of off-roading vehicles. Its smooth power delivery, durability, and ease of maintenance have made it a popular choice for both everyday driving and extreme off-road adventures. While the 4.0L inline 6 may no longer be in production, its legacy continues to influence the design and engineering of Jeep vehicles today.


  1. What models did the Jeep 4.0L inline 6 engine power? The 4.0L inline 6 engine powered various Jeep models, including the Cherokee, Grand Cherokee, Wrangler, and Comanche.
  2. Are there any modern Jeep models with an inline 6 engine? As of now, there are no current Jeep models featuring an inline 6 engine. The 3.6L Pentastar V6 has replaced it in most applications.
  3. Why did Jeep stop using the 4.0L inline 6 engine? Jeep discontinued the 4.0L inline 6 engine due to changing emissions standards, fuel efficiency requirements, and the desire to implement more modern engine technology.
  4. Can I still find parts for my Jeep 4.0L inline 6 engine? Yes, the 4.0L inline 6 engine is still well-supported in the aftermarket, and many parts are readily available for repair and maintenance.
  5. Are there any aftermarket upgrades available for the Jeep inline 6 engine? Yes, there are various aftermarket upgrades available for the Jeep inline 6 engine, including performance camshafts, intake and exhaust systems, and even stroker kits to increase displacement and power output.
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