Exam Question

(a) Build-up of Deposits
Residual fuels are inexpensive, incompletely distilled petroleum products that contain high levels of impurities. These include carbon residue , ash, and sediments, along with elements like sulfur, vanadium, aluminum, and silicon. When combustion is incomplete, which can be caused by improper fuel treatment, incorrect viscosity, or issues with fuel injection timing and pressure, the heavy carbon particles don't fully convert to carbon dioxide. Instead, they get deposited on hot surfaces, such as the turbocharger's nozzles and blades, where they stick and accumulate. This buildup reduces the efficiency of the turbocharger and can cause imbalanced rotation.
Minimization:
Ensure the fuel is purified correctly to remove impurities like sediments and water.