The Japanese company assembled the 3.0-liter Isuzu 4JX1 diesel engine from 1998 to 2004 and installed it on many of its models, such as the Wizard, Trooper or the similar Opel Monterey. This 16-valve DOHC engine was fundamentally different from its OHV predecessors.
J-engine family: 4JB1, 4JX1, 4JG2, 4JJ1, 4JJ3.
Specifications
| Production years | 1998-2004 |
| Displacement, cc | 2999 |
| Fuel system | HEUI |
| Power output, hp | 145 – 160 |
| Torque output, Nm | 295 – 335 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 95.4 |
| Piston stroke, mm | 104.9 |
| Compression ratio | 19.0 |
| Features | DOHC, intercooler |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | IHI RHF5 |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 7.5 |
| Fuel type | diesel |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for Isuzu Trooper 2000) — city — highway — combined |
13.6 8.7 10.1 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 280 |
The engine was installed on:
- Isuzu MU 2 (UE) in 1998 – 2004;
- Isuzu Rodeo 2 (UE) in 1998 – 2002;
- Isuzu Trooper 2 (UB2) in 1998 – 2002;
- Isuzu Wizard 2 (UE) in 1998 – 2004;
- Opel Monterey A (M92) in 1998 – 1999;
- Honda Horizon 1 in 1998 – 1999.
Disadvantages of the Isuzu 4JX1 engine
- This is one of the most problematic Isuzu diesels.
- Most of its breakdowns are related to the vagaries of the unusual HEUI fuel system.
- There are especially many complaints about the ingress of diesel fuel into the oil through nozzle seals.
- Monitor the condition of the timing belt, if it breaks at high speed, the valves bend.
- There are no hydraulic lifters here and periodically you need to adjust the valve clearances.
Frequently asked questions about the Isuzu 4JX1
How much power does the Isuzu 4JX1 make?
The Isuzu 4JX1 develops 145 - 160 hp and 295 - 335 Nm of torque.
How much oil does the Isuzu 4JX1 take and which one?
Engine oil capacity: 7.5 liters. Recommended oil: 5W-30.
Does the Isuzu 4JX1 have a timing belt or chain?
The Isuzu 4JX1 uses a timing belt.
Is the Isuzu 4JX1 turbocharged?
Yes, the Isuzu 4JX1 is turbocharged (IHI RHF5).
Does the Isuzu 4JX1 need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Isuzu 4JX1 last?
The typical lifespan of the Isuzu 4JX1 is ~300 000 km with proper maintenance.
What is the fuel consumption of the Isuzu 4JX1?
Isuzu Trooper 2000: city 13.6, highway 8.7, combined 10.1 L/100 km.
What cars was the Isuzu 4JX1 installed on?
Isuzu MU 2 (UE) in 1998 - 2004; Isuzu Rodeo 2 (UE) in 1998 - 2002; Isuzu Trooper 2 (UB2) in 1998 - 2002; Isuzu Wizard 2 (UE) in 1998 - 2004; Opel Monterey A (M92) in 1998 - 1999; Honda Horizon 1 in 1998 - 1999.
What are the common problems of the Isuzu 4JX1?
This is one of the most problematic Isuzu diesels. Most of its breakdowns are related to the vagaries of the unusual HEUI fuel system. All known problems.
Where to find vin or frame number of the rodeo 4jx1 engine
In general, the frame number should be on the frame on the right side in the direction of travel in the area of the rear right wheel. Sometimes under the right front door. Sometimes in the right rear arch.