What Causes Air in the Radiator?

[OGrace]

The presence of air in the radiator is caused by wear and tear on components such as piston rings and cylinder liners. Below are the specific reasons for air in the radiator: 1. Wear of piston rings and cylinder liners: When components like valves, piston rings, and cylinder liners wear out, it leads to insufficient compression pressure and oil entering the combustion chamber. This alters the normal air-fuel mixture ratio at the end of the compression stroke, causing fuel to burn under oxygen-deficient conditions. This combustion process tends to produce carbon deposits, resulting in exhaust gases with thick black smoke. 2. Changes in combustion chamber shape: The shape of the combustion chamber can degrade due to manufacturing quality or prolonged use, leading to excessive or insufficient compression clearance or incorrect piston positioning. These changes affect the combustion chamber's shape and volume, thereby impairing the quality of the air-fuel mixture and worsening combustion conditions. 3. Excessive fuel supply: An oversupply of fuel increases the amount of oil entering the cylinder, creating a fuel-rich and air-lean condition that results in incomplete combustion. Additionally, excessive workload, low-quality fuel, and low operating temperatures can also cause black smoke in the exhaust.