technic assembleTechnic Engine Cylinder, Piston & Connecting Rod Set (2850b, 2851, 2852)

Build or repair a working LEGO® Technic piston engine with this Technic Engine Cylinder, Piston & Connecting Rod Set. The bundle contains four grey engine cylinders, four grey connecting rods and four yellow pistons, providing the essential components for a four-cylinder engine mechanism.

LEGO Technic Engine Components

These specialised Technic pieces work together to recreate the reciprocating movement of pistons inside an engine. The pistons slide within the cylinder housings, while the connecting rods transfer movement to a compatible crankshaft, allowing builders to create realistic mechanical motion.

Included Parts

• 4 × Technic Engine Cylinder (2850b): Light Bluish Gray cylinder housings designed to guide moving pistons.
• 4 × Technic Engine Connecting Rod (2851): Light Bluish Gray rods that connect the pistons to a compatible crankshaft mechanism.
• 4 × Technic Engine Piston (2852): Yellow pistons designed to move inside the engine cylinders.

Build Your Own Technic Engine

This 12-piece engine component bundle is useful for restoring LEGO Technic vehicles, replacing missing engine parts or constructing custom mechanical models. The components can be arranged into compatible inline or V-style engine configurations, depending on the crankshaft and supporting structure used.

Whether you're repairing an existing model or experimenting with moving engine mechanisms, these parts provide a practical starting point for a functional piston assembly.

Explore more LEGO® Technic parts and pieces to find compatible axles, gears and other mechanical components for your build.