fastplane

I have Saito engine with stuck piston ring. Need to remove and replace the ring but not having any success. I thought about gently heating the piston crown, which would expand the aluminum more than the steel ring and maybe pop the ring loose.
I have soaked the piston in oil and WD40 but no progress.
Any other better ideas?

Also when reassembling the engine how do I correctly time the cam gear with the crankshaft?
Thanks,

delman

The quickest would be to place it in the oven at 200 deg for a few minutes if its old castor.

BillS

Last resort.

I cooked a piston in antifreeze for a couple of days and then used penetration oil and carb cleaner without success. Finally I heated the piston with a torch and drove the ring out using a scribe as a punch. Had to ask wife to tap, tap, tap with a small hammer while I held everything with gloves. The ring came out in several pieces.

Bill

hsf

IF you go to Horizon Hobbies site and down load Manual

The Ghost

You don't say why the ring was stuck. May need a new piston as well.

Cheers

fastplane

The ring appeared to be frozen to the piston. The bearings were stuck as well. I finally was able to free up all part by more soaking and working loose.
Thanks for the good ideas from everybody.