Question 91Motor Plants - 1st Asst/Chief

The correct answer is C) High pressure fuel pumps and fuel injectors. Catalytic fines, composed of aluminum oxide and/or silicon dioxide, can cause significant damage to critical engine components when present in residual fuels. The high pressure fuel pumps and fuel injectors are the components most affected by these abrasive contaminants. The high pressures and tight clearances in these components make them highly susceptible to wear and scoring from the presence of catalytic fines in the fuel. The other answer choices are incorrect because: A) cylinder liners are not as directly impacted by catalytic fines as the high pressure fuel system components; B) piston rings are more affected by cylinder liner wear than catalytic fines; and D) while catalytic fines can damage turbocharger blading, the fuel injectors are the primary components impacted.