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I have a leaking cylinder base seal which needs to be replaced. So, with everything on the engine removed to facilitate the withdrawal of the cylinder, as yet I haven't been able to budge it. I can wriggle it very sightly, there is movement! But it refuses to come down.

I haven't and won't attempt to use anything to prise it out. It has been suggested that I pressurise the cylinder, with air (with both the valves closed) and hopefully force a downward movement of the cylinder.

Has anyone employed this method? Or does anyone have any other suggestions?
You need a box of shed matches.

Apply from a distance, preferably with kerosene to assist the removal of the cylinder and then fill in the insurance form...... Missing, one Gypsy Major equipped aeroplane :mrgreen:
I'd try as johnm suggests first. You could try warming the cylinder externally using an electric heat gun to get it to expand a bit.

If you do use compressed air be careful how much pressure you apply, if it lets go with a lot of pressure behind it, it will go with a bit of a bang. There is quite a lot of surface area in the cylinder.

Would suggest some sort of restraint to prevent cylinder dropping off!

But, you really need to identify why it is binding first so you don't damage something.
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