In article ,
"Stormin Mormon" wrote:

As others have mentioned, that compressor may be too small to drive an
impact wrench. Harbor Freight has an electric impact for sale, which is
supposed to deliver 200# foot pounds. Just plug it in, and no compressor
needed. It's rather long, from back to socket so it won't fit in some
spaces.

For your application, how about a socket and a long breaker bar? Impact
wrenches do have the advantage of "rattling" which tends to break up rust.
With a breaker bar, you may need to heat up the nut.

The breaker bar isn't going to do anything but turn the engine, unless
the OP uses it in the manner I suggested earlier...