The Isuzu 4JG2 3.1-liter diesel engine was produced by the concern from 1991 to 2000 and was installed in many SUVs, such as the Trooper or the similar Opel Monterey. There were atmospheric, turbocharged versions of the unit and the most powerful ones with an intercooler.
The J-engine line also includes diesels: 4JB1, 4JX1, 4JG2, 4JJ1, 4JJ3.
Specifications
| Production years | 1991-2000 |
| Displacement, cc | 3059 |
| Fuel system | prechambers |
| Power output, hp | 95 – 115 115 – 135 (4JG2T or 4JG2-TC) |
| Torque output, Nm | 185 – 205 270 – 295 (4JG2T or 4JG2-TC) |
| Cylinder block | cast iron R4 |
| Block head | cast iron 8v |
| Cylinder bore, mm | 95.4 |
| Piston stroke, mm | 107 |
| Compression ratio | 20.1 20.0 (4JG2T or 4JG2-TC) |
| Features | OHV OHV / intercooler (4JG2T or 4JG2-TC) |
| Hydraulic lifters | no |
| Timing drive | gears belt (4JG2T or 4JG2-TC) |
| Phase regulator | no |
| Turbocharging | no IHI RHB5 (4JG2T or 4JG2-TC) |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 6.0 |
| Fuel type | diesel |
| Euro standards | EURO 1 EURO 2 (4JG2T or 4JG2-TC) |
| Fuel consumption, L/100 km (for Isuzu Trooper 1994) — city — highway — combined |
12.1 8.0 9.7 |
| Engine lifespan, km | ~450 000 |
| Weight, kg | 260 |
The engine was installed on:
- Isuzu Faster 3 (TF) in 1993 – 1998;
- Isuzu MU 1 (UC) in 1993 – 1998;
- Isuzu Trooper 2 (UB2) in 1991 – 2000;
- Isuzu Wizard 1 (UC) in 1992 – 1998;
- Opel Monterey A (M92) in 1992 – 1999;
- Honda Horizon 1 in 1994 – 1998.
Disadvantages of the Isuzu 4JG2 engine
- This is one of the most reliable and unpretentious Isuzu diesel engines with a huge resource.
- The most famous engine problem is cylinder head cracking with exhaust gas breakthrough.
- The timing belt lasts a very long time, but its breakage is extremely dangerous for the power unit.
- It is difficult to find specialists for the repair and adjustment of ZEXEL fuel equipment.
- The manual recommends adjusting the valve clearances every 40,000 km.
Well my 4jg2 engine has a knocking sound in it both on low idle and high idle but I’ll first measure the size of the pistons and its cylives and had less power.
Thanks
What is the main problem if the engine is less power?