Isuzu D-Max 2.5L 4JA1 Diesel Engine Assembly – Tested

Description

The Isuzu 4JA1 2.5L diesel engine is known worldwide for its rugged reliability, fuel efficiency, and durability. Designed for the Isuzu D-Max and other Isuzu commercial vehicles, the 4JA1 engine is built to handle demanding conditions, making it one of the most trusted choices for light trucks.

This listing is for a complete used JDM 4JA1 engine assembly, carefully sourced and compression tested to ensure strong performance. Each motor is inspected for leaks, compression balance, and overall health before shipping. With typical mileage between 70,000–100,000 miles (110,000–160,000 km), this unit is ready to provide many more years of dependable service.

Performance & Reliability

The 4JA1 is a 2.5L inline-4 SOHC diesel engine producing 78–100 horsepower, depending on year and variant. It features direct injection, excellent fuel economy, and robust construction. Known for handling heavy loads and long hours of operation, the 4JA1 remains a proven powerplant in many markets.

Each engine we sell undergoes rigorous testing, including compression and leak checks, to ensure it meets OEM performance standards. Buyers can count on a strong, fuel-efficient, and long-lasting replacement motor.

Fitment

The Isuzu 4JA1 2.5L diesel engine is a direct-fit OEM replacement for several Isuzu D-Max and related models.

Fits in:

2002–2012 Isuzu D-Max 2.5L Diesel (4JA1)

2002–2012 Isuzu KB Series (South Africa market)

2002–2008 Holden Rodeo 2.5L Diesel (some markets)

⚠️ Always confirm your engine code (4JA1) before purchase to ensure compatibility.

Warranty & Installation

This engine includes a 6-month limited warranty covering internal components. We recommend professional installation and replacing service items such as belts, gaskets, and fluids during the swap for maximum performance and longevity.

Closing

Upgrade or replace your workhorse with a reliable **Isuzu 4JA1 2.