The 1.8-liter Hyundai G4JN engine was assembled from 1998 to 2005 in South Korea under license, because structurally it was a complete copy of the Mitsubishi power unit with the 4G67 index. This Sirius II series DOHC motor was installed for some time on local versions of the Sonata and Magentis.
Sirius family:
1.6 L – G4CR;
1.8 L – G4CN, G4CM, G4JN;
2.0 L – G4CP, G4JP;
2.4 L – G4JS, G4CS.
Specifications
| Production years | 1998-2005 |
| Displacement, cc | 1836 |
| Fuel system | injector |
| Power output, hp | 125 – 135 |
| Torque output, Nm | 170 – 180 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 81.5 |
| Piston stroke, mm | 88 |
| Compression ratio | 10.5 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 10W-40 |
| Engine oil capacity, liter | 3.7 |
| Fuel type | petrol |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for Kia Magentis 2001) — city — highway — combined |
9.9 7.6 8.5 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 148.2 (without attachments) |
The engine was installed on:
- Hyundai Sonata 4 (EF) in 1998 – 2004;
- Kia Magentis 1 (GD) in 2000 – 2005.
Disadvantages of the Hyundai G4JN engine
- You need to carefully monitor the condition of the belts, there are two of them: timing and balancers;
- If any of them breaks, you will have to wait for a complex and expensive overhaul;
- Quite quickly fail and hydraulic lifters begin to click loudly;
- Vibrations of the power unit are usually caused by severe wear of the engine mounts;
- The engine speed most often floats due to contamination of the injectors, throttle or idle speed controller.
Frequently asked questions about the Hyundai-Kia G4JN
How much power does the Hyundai-Kia G4JN make?
The Hyundai-Kia G4JN develops 125 - 135 hp and 170 - 180 Nm of torque.
How much oil does the Hyundai-Kia G4JN take and which one?
Engine oil capacity: 3.7 liters. Recommended oil: 10W-40.
Does the Hyundai-Kia G4JN have a timing belt or chain?
The Hyundai-Kia G4JN uses a timing belt.
Is the Hyundai-Kia G4JN turbocharged?
No, the Hyundai-Kia G4JN is naturally aspirated.
Does the Hyundai-Kia G4JN need valve clearance adjustment?
No, the Hyundai-Kia G4JN has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Hyundai-Kia G4JN last?
The typical lifespan of the Hyundai-Kia G4JN is ~300 000 km with proper maintenance.
What is the fuel consumption of the Hyundai-Kia G4JN?
Kia Magentis 2001: city 9.9, highway 7.6, combined 8.5 L/100 km.
What cars was the Hyundai-Kia G4JN installed on?
Hyundai Sonata 4 (EF) in 1998 - 2004; Kia Magentis 1 (GD) in 2000 - 2005.
What are the common problems of the Hyundai-Kia G4JN?
You need to carefully monitor the condition of the belts, there are two of them: timing and balancers. If any of them breaks, you will have to wait for a complex and expensive overhaul. All known problems.
