Engine Overview and Common Failures
The weight of the G4KH engine according to the catalog is 135.5 kg. The G4KH engine number is located at the front, at the junction with the transmission. Bearing rotation. These turbo engines are highly demanding in terms of oil quality and its replacement schedule; otherwise, there is a high risk of bearing rotation at around 100 thousand kilometers. Service centers also blame the unsuccessful balancing block combined with the oil pump: due to the rapid wear of its bearings, the pressure in the engine lubrication system decreases. E-CVVT phase regulator. Second-generation units were recalled by the company for E-CVVT phase regulator replacement, and our Optima GT modification was also affected by this. The problem was often solved by installing a new cover, but in severe cases, the entire unit had to be replaced. Oil consumption. First-generation units did not have oil injectors, and scoring is common in them, but more often than not, the cause of oil consumption is the elliptical shape of the cylinders. The stiffness of the aluminum block is low, and it quickly leads to overheating. Other drawbacks. Like any direct injection engine, intake valves quickly accumulate carbon deposits. The timing chain has a relatively short service life, temperature sensors frequently fail, various air ducts constantly rupture, and oil leaks occur through the seals.