What Effects Can High Temperatures Have on Diesel Vehicles?
1 Answers
Consequences of high temperatures in diesel vehicles: 1. Decreased engine power: When the vehicle operates in temperatures above 35°C, with a tailwind, or under heavy load at low speeds, engine overheating becomes more severe, further reducing the engine's air charging efficiency. This leads to a decrease in the amount of fresh air-fuel mixture entering the cylinders, lowering the average effective pressure in the cylinders and resulting in reduced engine power. 2. Increased fuel consumption: When the engine temperature is too high, the lubricating oil that enters the cylinders can form carbon deposits under high-temperature, low-oxygen conditions. These deposits accumulate on the piston crown, combustion chamber walls, valve heads, and spark plugs, creating hot spots that can cause pre-ignition and abnormal combustion. This can lead to deformation of the engine block and cylinder head, and even cracks or warping. It can also burn the cylinder head gasket, reducing cylinder pressure at the end of compression and increasing fuel consumption. 3. Increased component wear: High temperatures can cause the lubricating oil to oxidize and degrade, forming deposits that adhere to the piston rings, cylinder walls, and other friction surfaces, reducing heat conductivity. The viscosity of the lubricating oil decreases, oil pressure drops, and lubrication performance deteriorates. The oil film on the cylinder walls weakens under impact loads, accelerating component wear.
