Engine Overview and Common Failures
The weight of the VAZ 2123 engine according to the catalog is 127 kg. The VAZ 2123 engine number can be found in two places. The most well-known problem with this engine is the unreliable chain tensioner, and its failure often leads to chain skipping and valve-to-piston contact. Engine overheating is the second most common issue, caused by a malfunctioning thermostat or water pump, as well as regular coolant leaks due to cracked hoses or expansion tank. Oil consumption also becomes a problem after reaching 100,000 km, usually due to worn oil control rings, piston rings, or a clogged PCV system. Other problems include the not-so-durable auxiliary equipment, ignition module, frequent leaks from the valve cover and rear crankshaft seal. Additionally, until 2008, this engine was equipped with unreliable hydraulic lifters.