Which statement best describes Integral cylinder liners?

• A. The block and cylinders are machined into a single, integral unit
• B. A machined steel sleeve pressed into the block to form the cylinder
• C. The liner is in direct contact with coolant
• D. The liner is removable

Answer: (A)

Integral cylinder liners are cylinders formed directly in the engine block, so the bore is machined into the block casting and the wall is made from the same piece of material. There is no separate sleeve or liner that can be removed; the block and the cylinder form a single, solid unit. This is why describing the block and cylinders as machined into a single integral unit is the correct characterization. The other statements describe different designs—such as a machined steel sleeve pressed into the block, which creates a separate liner; and a liner that is removable or in direct contact with coolant in a way that doesn’t define an integral arrangement.