With lawn mowers, if you rotate the blade backwards, you can hit a
compression stroke. Might happen with cars, too. With the old standard
shifts, you could leave it in gear. Turning the flywheel bolt shifts the
car. I've done that.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
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"Smitty Two" wrote in message
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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...