CMB 90 Liner removal

[ids987]

Hi everyone, just looking for some liner removal tips please. With the CMB Evo style engines, if the liner doesn't pull out easily, I usually use a cable tie in the exhaust port (after removing the C-Clip, but leaving the pin in place), doubled over, and / or across and looped into the boost port; then turn the engine over with spanner on coupling to shift liner. So far this has always worked for me, and I've never caused any noticeable damage.

I started dismantling a 90 yesterday, however, and it's particularly stubborn. Several cable ties in pieces, and no sign of the liner moving.

I guess heat is going to be involved, but it's a AAC P/S set, so liner expansion will be much the same as the case; though i guess the case will get hot first. Also, if it doesn't loosen up much, it's going to be a lot more difficult to try and use physical means on a hot engine.

Might try again with stronger cable ties later anyway (depending on other ideas / suggestions). The ones I used yesterday were cheap ones, and seemed to snap/shear/cut very easily. Any input welcomed !!

Thanks: Ian

 

[BigChuck]

Bought a pedal bike tire tool years ago. It is a blue hard plastic. Made by park.... You may have to drop the whole motor in penetrating oil and let it soak.

 

[eekern]

I just removed a stubborn sleeve in a picco (.12 albeit) by putting in a 275 oven for 25 minutes then pressing up on the bottom of the sleeve with a wooden dowel. Slid right out.

 

[ids987]

Thanks very much guys. I accidentally opened two threads on this topic. I got a few suggestions in the other thread too; one of which was from Stuart Barr, who suggested a plug washer in each transfer port. I'm happy to say that worked a treat for me.