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The KA24E is a 2.4-liter single overhead cam inline-four engine produced by Nissan from 1989 through the mid-1990s, used in models such as the 240SX, Hardbody pickup, Stanza, and early Altima. It features a cast-iron block, aluminum head, and a timing chain rather than a belt, with early versions using a two-barrel carburetor and later versions receiving multi-point fuel injection. Common service considerations include timing chain tensioner wear, valve clearance adjustments via shim-under-bucket, and oil leaks from the valve cover gasket and front crank seal. The engine is generally regarded for durability, with many examples reaching high mileage when oil changes and cooling system maintenance are kept current.

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