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I never said take the injection lines off ! I said to loosen the injector mounting bolts.

You don't get the build-up of pressure like you do when the engine is running. For mildly stuck injectors I'm sure just spinning the engine would work though.

That is a common trick in the heavy equipment world. Loosen the injectors and then start the engine. Usually they all come busting out of there bores and spraying all over the place. Of course you must shut the engine down quickly ! Sometimes the hold-down bolts will break though so be careful...