Categories: INDUSTRIAL

Isuzu Motors is a prominent Japanese company specializing in the manufacturing of commercial vehicles and diesel engines. With over a century of history, Isuzu has established itself in markets across more than a hundred countries thanks to its wide range of products, including light, medium, and heavy-duty trucks, as well as SUVs and pickups. From its humble beginnings as a diesel engine manufacturing division to becoming a global leader in the automotive industry, Isuzu has maintained an unwavering commitment to innovation, durability, and excellence.

Today we will focus on two of its most iconic engines, the Isuzu 4JG2 engine and the Isuzu 4JJ1 engine, both of which share similarities in their construction as they are two four-cylinder diesel engines with direct injection systems, although with their own characteristics.


Isuzu 4JG2 engine

The Isuzu 4JG2 diesel engine with a displacement of 3.1 liters was produced by the company from 1991 to 2000 and was installed in various SUV models such as the Trooper or the similar Opel Monterey. There were naturally aspirated and turbocharged versions of the unit, with the most powerful ones featuring an intercooler.

Technical Specifications:
  • Displacement: 3.1 liters (3100 cc)
  • Cylinder configuration: Four cylinders in line
  • Injection system: Direct injection
  • Cylinder bore: 95.4 mm
  • Piston stroke: 104.9 mm
  • Maximum power:
  • 76 kW (103 hp) at 3600 rpm (early versions)
  • 85 kW (115 hp) at 3800 rpm (later versions)

The most common problems with this engine are related to the injection system and cracking of the cylinder head due to exhaust gas intrusion. However, the timing belt is very durable, although its failure is extremely dangerous for the power unit.


Isuzu 4JJ1 engine

The Isuzu 4JJ1 engine is a four-cylinder diesel engine, succeeding the 4JG2 model. Due to its similarities and evolution in terms of power and performance, the 4JJ1 can be considered an evolution of the 4JG2.

Technical Specifications:
  • Displacement: 3.0 liters (2999 cc)
  • Cylinder configuration: Four cylinders in line
  • Fuel type: Diesel
  • Injection system: Common Rail direct injection
  • Cylinder bore: 95.4 mm
  • Piston stroke: 104.9 mm
  • Compression ratio: 17.3:1
  • Maximum power:
  • 120 kW (163 hp) at 3600 rpm (in early versions)
  • 130 kW (177 hp) at 3600 rpm (in later versions)

Common issues with this Isuzu model include carbon buildup in the EGR valve, variation in valve clearance due to the absence of hydraulic self-adjustment, and particle filter obstruction after relatively few kilometers.


Other well-known Isuzu engines would be those belonging to the H series, the 4HK1 and the 6HK1. Both engines share characteristics such as the famous common rail injection system; however, they differ in that the 4HK1 has 4 cylinders and the 6HK1 has 6. This is because there was a need for a more powerful engine, hence the inclusion of 2 more cylinders.

Also notable are the Isuzu L series engines, specifically the 4LE1 and 4LE2. Both engines have four cylinders in line and are water-cooled. They have the same bore (85 mm) and stroke (96 mm). The difference is that the 4LE1 engine is indirect injection, and the 4LE2 engine is direct injection.


At Oryx Parts, we have a wide range of spare parts for Isuzu 4JG2 and Isuzu 4JJ1 engines, including complete repair kits, for these aforementioned engines as well as others like 4HK1, 6HK1, 4LE1, and 4LE2.

In addition to Isuzu spare parts, we offer a wide range of engine parts for brands such as John Deere, Kubota, Yanmar, Komatsu, Deutz, Perkins… among others.

We supply engine parts throughout Europe. If you want your repair to be a success, contact us.

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