GASKET-CYLINDER HEAD 6N8505 - Caterpillar

The aftercooler is on top of the engine. The aftercooler has a two-stage core assembly. Coolant from the jacket water circuit flows through first stage of the aftercooler core. Coolant from the separate circuit flows through second stage of the aftercooler core.Note: For some engines that are used for cogeneration, the aftercooler first stage may also be separate.The air/fuel mixture from the turbocharger compressor flows through the throttle into the aftercooler cover. The air/fuel mixture passes through the fins of the aftercooler core to exchange heat with the coolant. The temperature of the compressed air/fuel mixture is reduced in the aftercooler. This action increases the density of the air/fuel mixture and results in more efficient combustion.The temperature of the air/fuel mixture is initially reduced in the first stage. The second stage provides further reduction of the air/fuel mixture temperature. The air/fuel mixture from the aftercooler is distributed through the air inlet manifold to the cylinders for combustion.