Which valve component is typically ground to adjust seating height?

Which valve component is typically ground to adjust seating height?

• A. The valve stem
• B. The valve tip
• C. The valve face
• D. The valve head

Answer: (B)

The main idea here is how you set the valve’s effective height in the valve train. Grounding the valve tip changes the overall length of the valve, which directly sets how far the valve projects above the head and how the rocker/lifter contacts it. This is the adjustment you use to achieve the correct seating height and valve clearance. The valve tip is ground because it’s the part that determines that projection and the lash with the rocker arm. The valve face, by contrast, is ground to restore or improve the sealing surface against the seat, not to adjust height. Grinding the stem would alter alignment and could weaken the stem or throw off geometry, and the valve head isn’t adjusted for height in normal practice.

The main idea here is how you set the valve’s effective height in the valve train. Grounding the valve tip changes the overall length of the valve, which directly sets how far the valve projects above the head and how the rocker/lifter contacts it. This is the adjustment you use to achieve the correct seating height and valve clearance.

The valve tip is ground because it’s the part that determines that projection and the lash with the rocker arm. The valve face, by contrast, is ground to restore or improve the sealing surface against the seat, not to adjust height. Grinding the stem would alter alignment and could weaken the stem or throw off geometry, and the valve head isn’t adjusted for height in normal practice.