A truck with a splitter cylinder cover exhibits a constant flow of air from the exhaust port. Which issue is most likely responsible?

• A. An insert valve defect
• B. A gasket failure
• C. Both A and B
• D. Neither A nor B

Answer: (A)

The key idea is that a valve that can’t seal properly will vent air through the exhaust path continuously. The insert valve is what controls and seals the flow through the splitter cylinder cover. If that valve is defective, it won’t seat correctly, so air keeps escaping out the exhaust port no matter what position the control is in. A gasket failure, while it can cause leaks, typically shows as leakage at the gasket joints rather than a steady stream exiting the exhaust itself. So the persistent flow from the exhaust port best points to an insert valve defect.