Stuck Cylinder, Advice Needed!

what will it do to the coating on the Mahle

Coke has phosphoric acid in it which converts rust to a blackish substance just like rust converters... You can buy undiluted phosphoric acid- it's used for brick cleaning. I use it all the time, but never thought to try on seized parts before.

Not sure if it would damage any coating but you can't use those pistons as they are , right ? Try an old piston first and see . Or put one of those pistons upside down and use just enough coke to cover ring land . If it does damage the coating there are companies that will recoat pistons , have a friend that swears by this . He would have a piston coated to get optimal clearances . Hope this helps , good luck .

PB Blaster

Phosphoric acid is what we use to acid clean both tube nest and plate heat exchangers in the nuclear power industry. there are lots of warnings about using it on aluminium though, but this is for 24hr plus times. I think in the short term it may dissolve the "white powder" aluminium oxide corrosion that is binding the studs to the barrel. It is easily neutralized with water though.

7up or Sprite soda pop will dissolve the aluminum oxide powder. I think it's the citric acid that actually does the work. It saved me on a Mercury outboard engine that had been in salt water and then left in a barn for 10 years.

No success yet?

nope! letting it soak with the jack assembly on it, i don't want to break anything so i'm trying to be patient with it LOL

I pulled a stuck bultaco cylinder with a jacking device like you built.

Nothing beats regular maintainance removing cylinder and coat studs in copper paste

wow, now thats some maintenance!

I'm thinking silicone around the studs on the air cooled cylinders. Thick enough to seal the gap between the cylinder and the head.