That's certainly true for Newcomen's atmospheric engine, and possibly true for Watt's steam engine, but certainly not for an Otto cycle engine. You would at the

That's certainly true for Newcomen's atmospheric engine, and possibly true for Watt's steam engine, but certainly not for an Otto cycle engine. You would at the very least need a lathe and mill to make the precision parts necessary. Come to think of it, a video series about bootstrapping a 19th century machine shop from a 15th century blacksmith's shop would be extremely interesting.