What are the passages in the engine block that allow coolant to circulate called?

What are the passages in the engine block that allow coolant to circulate called?

• A. Water jackets
• B. Coolant galleries
• C. Oil galleries
• D. Intake runners

Answer: (A)

Water jackets are the passages in the engine block that allow coolant to circulate. They surround the hot cylinder walls and other components, so the coolant can absorb heat from the metal. As it moves through these jackets, the warmed coolant is carried to the radiator to release heat and keep the engine from overheating. Oil galleries, in contrast, are channels for lubrication, not cooling, and intake runners are ducts for the air–fuel mixture entering the cylinders. Some texts use the term coolant galleries, but the standard name for the circulating passages in the block is water jackets.

Water jackets are the passages in the engine block that allow coolant to circulate. They surround the hot cylinder walls and other components, so the coolant can absorb heat from the metal. As it moves through these jackets, the warmed coolant is carried to the radiator to release heat and keep the engine from overheating. Oil galleries, in contrast, are channels for lubrication, not cooling, and intake runners are ducts for the air–fuel mixture entering the cylinders. Some texts use the term coolant galleries, but the standard name for the circulating passages in the block is water jackets.