An engine has excessive valve guide wear. Technician A says to ream the guide and install a new valve with an oversized stem. Technician B says to knurl the valve stem and reinstall it in the guide. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct in recommending reaming the guide and installing a new valve with an oversized stem as this is the proper and more permanent repair for excessive valve guide wear. Technician B's suggestion to knurl the valve stem is not a recommended repair as it can cause additional wear to the guide and may not properly address the root cause of the excessive wear.

An Engine Has Excessive Valve Guide Wear