Knurling is one of the fastest ways to restore the inside diameter dimensions of a worn valve guide.

Knurling is one of the fastest ways to restore the inside diameter dimensions of a worn valve guide.

• A. False
• B. True
• C. It is used to finish the outer diameter only
• D. It is a method for polishing the valve seat

Answer: (B)

Knurling inside a bore relies on plastic deformation of the worn inner surface to bring the valve guide back to the proper diameter quickly. By using internal knurling with rollers, material is reshaped so the bore returns to a tighter, more uniform size without needing extensive cutting. This makes it a fast way to restore the inside diameter of a worn valve guide, which is why it’s identified as True. It’s not about finishing an outside diameter or polishing a valve seat, which is why those other descriptions don’t apply. After knurling, the bore is typically measured and may receive light finishing to meet exact tolerances, but the primary advantage is the speed of restoring the ID.

Knurling inside a bore relies on plastic deformation of the worn inner surface to bring the valve guide back to the proper diameter quickly. By using internal knurling with rollers, material is reshaped so the bore returns to a tighter, more uniform size without needing extensive cutting. This makes it a fast way to restore the inside diameter of a worn valve guide, which is why it’s identified as True. It’s not about finishing an outside diameter or polishing a valve seat, which is why those other descriptions don’t apply. After knurling, the bore is typically measured and may receive light finishing to meet exact tolerances, but the primary advantage is the speed of restoring the ID.