Big difference between grease and compressed air

Posted by Dan Bear Kelley on June 20, 2006 at 16:40:08 from (206.53.16.85):

In Reply to: Re: Stuck engine idea is this crazy or could it wo posted by Ron in Nebr on June 19, 2006 at 22:03:10:

I would be VERY hesitant to use compressed air. Once things popped loose, there is no telling the amount of force that will suddenly be loosed.
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Grease does not compress, so the whole action of the piston in the cylinder would be controlled by the amount of force put on the grease by the gun. If you use a hand-operated grease gun, you should have a great deal of control. Go easy, though! You will have a huge mechanical advantage with a grease gun, enough to split a head. And of course, once the piston starts moving, you should be able to take it out the rest of the way by hand. Filling the cylinder with oil before hand sounds rather messy, but then again, so does a bunch of grease. The oil method should work. :-)

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