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Injector Nozzle Service On Nissan SD Series Engines Nissan has revised the lower fuel injector gasket on their SD series diesel engines. This engine was introduced in 1981 as the SD-22 with a displacement of 2.2L. In 1984 the cylinder bore diameter was increased to bring engine displacement to 2.5L. This engine, the SD-25, was last used as part of the 1986 model year. Nissan recommends replacement of both upper and lower fuel injector gaskets whenever the injector assembly is removed from the cylinder head. Be sure to position the lower gasket with the convex edge toward the combustion chamber
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