Engine Hyundai-Kia G4JN

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.

The engine was installed on:

  • Hyundai Sonata 4 (EF) in 1998 – 2004;
  • Kia Magentis 1 (GD) in 2000 – 2005.


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
Engine lifespan, km ~300 000
Weight, kg 148.2 (without attachments)

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.

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