There are a few things to consider when wondering if you can take an engine on a plane.
The first is the weight and size of the engine. If the engine is too large or too heavy, it may not be able to fit on the plane or it may exceed the weight limit for luggage.
Another thing to consider is whether the engine is combustible. If the engine is made of combustible materials, it will not be allowed on the plane for safety reasons.
Finally, you'll need to check with the airline to see if they have any restrictions on bringing engines onboard. Some airlines may allow engines but have specific requirements, such as that they must be packed in a certain way or declared at check-in.
In general, it is possible to take an engine on a plane as long as it meets the size, weight and safety requirements of the airline.