How to free seized cylinder?

[Bax]

I'm playing around with an old Honda C200 engine and found that the cylinder is seized. Really, really seized!

Any ideas on how to free it?

Already tried: Block of wood and hammer.
(After soaking for 2 days with WD-40)

Result: Cylinder is laughing at me and my thumb is sore.



Bax

[Bax]

The FrankenBike.

Ugly Fu**er, ain't she?





Bax

I'm playing around with an old Honda C200 engine and found that the cylinder is seized. Really, really seized!

Any ideas on how to free it?

Already tried: Block of wood and hammer.
(After soaking for 2 days with WD-40)

Result: Cylinder is laughing at me and my thumb is sore.



Bax

[ZooTech]

Try a penetrating oil. WD40 is formulated to displace water (hence the name). You'll probably have to tear the motor down.

[9000white]

pour the cylinder full of diesel fuel and let it sit for a week.if it dont free up then forget it.

[Bax]

Have you heard of a product called MetalClean or CleanMetal. Someone suggested I try it but I never heard of it and am having trouble finding it.

As for tearing the engine down, that's what I was in the process of doing when I ran into the seized piston/cylinder.

Unfortunately, the head bolts are also seized so I can't separate the engine to attack from the other side. It never rains but it pours.


Thanks for responding.


Bax

[mustangski]

The best thing that I found is a product called Marvel mystery oil. It works great, I used it to free up the cylinders on an old 302 I had a couple of years back. Just pour some in the cylinder, let it soak overnight and then break out the hammer and wood again. Good luck.

[JoeyMac]

Marvel works good, brake fluid is probably the best though. Good luck!