Technician A says a mushroomed valve can be driven out with a punch and a hammer. Technician B says the mushroomed tip must be dressed with a file before the valve can be removed. Who is right?

Question

Quizplus · Accepted Answer

Technician B is correct. Mushroomed valve tips should be dressed with a file before removal to prevent damaging the valve guide or cylinder head. It is not recommended to drive out a mushroomed valve with a punch and hammer as it can cause further damage to the valve, guide, and head.

Technician a Says a Mushroomed Valve Can Be Driven Out