Which statement is NOT a typical cause of loss of power in a marine diesel engine?

• A. Inadequate fuel delivery
• B. Proper lubrication used
• C. Restricted air intake
• D. Incorrect timing

Answer: (B)

When a marine diesel engine loses power, the usual suspects are problems that directly limit the fuel-air combustion process or its timing. Inadequate fuel delivery means not enough fuel reaches the cylinders, so they can’t produce full torque. Restricted air intake lowers the amount of oxygen available for burning fuel, which also reduces power. Incorrect timing disrupts when the fuel is burned, leading to less effective work per cycle.

Using proper lubrication, on the other hand, doesn’t cause power loss. Good lubrication reduces friction and heat, helping the engine maintain performance rather than diminish it. So this statement isn’t a typical cause of loss of power, making it the best answer.