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The 6.5 injector is referred to as a pintle style injector, which is commonly used in an engine with pre-combustion cylinders. The injector has a needle plunger that plugs off the spray hole when it is closed. Once the pump allows fluid flow to the particular cylinder, the high fuel pressure forces the pintle away from the whole seat and the fuel stream is injected through the pre-combustion chamber into the combustion chamber. This type of engine often runs dirtier than a direct injected engine and the injectors require replacing between 80-100 thousand miles.
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