Check out Steam engine 3D model on CGTrader for $14.99. High-quality mesh by nemo81.
STL (Stereolithography, filesize: 66.7 MB), OBJ (OBJ, filesize: 39.3 MB), GLTF (glTF, filesize: 89.9 MB), USDZ (USDZ, filesize: 29.8 MB), MAX (Autodesk 3ds Max, filesize: 39.5 MB), FBX (Autodesk FBX, filesize: 36.7 MB)