Engine Overview and Common Failures
According to the catalog, the weight of the G4NA engine is 117 kg. The engine number G4NA is located at the front, at the junction with the gearbox. The most serious problem of this unit is the appearance of scratches in the cylinders. The cause is a weak catalyst that quickly deteriorates from our fuel, and when it gets clogged, its crumbs are sucked into the combustion chambers and they scratch the walls. Excessive oil consumption can be caused not only by scratches in the cylinders. Due to the design, there is an open cooling jacket and quite thin cast iron sleeves, which can easily go elliptical during active operation or regular overheating. The timing chain of this engine usually lasts for 300,000 km for careful drivers, but if the engine is constantly revved, its lifespan will be reduced by at least half: there are many examples of replacement before 100,000 km. When the chain stretches, it does not break, but usually jumps and often bends the valves. Other shortcomings mentioned on forums include regular leaks of lubricant and antifreeze due to weak gaskets, a rather modest lifespan of the water pump, generator clutches, and power unit supports. Additionally, early models had weak bearings that could simply rotate.