Technician A says that you must compress the valve spring onto the cylinder head before you can install an O-ring valve stem seal. Technician B says that positive-type valve stem seals are installed before the valve spring. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct. The valve spring must be compressed so that there is enough clearance to install the valve stem seal. Positive-type valve stem seals are designed to be installed before the valve spring, but this is not always the case. It depends on the specific type of valve stem seal and the manufacturer's instructions.

Technician a Says That You Must Compress the Valve Spring