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Piston Cross Head
Large slow-speed Diesel engines may require additional support for the side forces on the piston. These engines typically use cross head pistons. The main piston has a large piston rod extending downwards from the piston to what is effectively a second smaller-diameter piston. The main piston is responsible for gas sealing and carries the piston rings. The smaller piston is purely a mechanical guide. It runs within a small cylinder as a trunk guide and also carries the gudgeon pin.
Because of the additional weight of these pistons, they are not used for high-speed engines.
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