What corrective action should be taken to fix insufficient liner protrusion?

• A. Add shims to the liner counterbore
• B. Grind the liner and retorque
• C. Replace the liner only
• D. Use a thicker head gasket

Answer: (A)

When cylinder liner protrusion is too small, you fix it by adjusting the liner height in the block so the top of the liner sits at the correct distance from the deck. The most reliable way to do this is to add shims in the liner counterbore under the liner. These shims raise the liner slightly, bringing the protrusion up to specification without altering other components. Grinding the liner would typically remove material and not achieve the desired increase in height; it can also disturb seating and distort alignment. Retorquing the fasteners won’t change how far the liner sits relative to the deck, and replacing the liner alone addresses other issues but not the precise height adjustment. Using a thicker head gasket might change overall clearances but isn’t a targeted, consistent method to correct insufficient protrusion and can affect sealing and compression elsewhere.