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YS 50 heli engine strip down

stuck liner, any ideas?

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Mr.B.18/02/2018 14:24:08
412 forum posts
26 photos

I need to change the bearing on my YS50ST heli engine. With YSs to remove the piston you first have to pull the liner out. I have heated it with a hot air gun, domestic oven, soaked it in penetrating oil, pulled it, tried a small peace of wood through the exhaust and transfer ports and pushing with the piston and a brass drift on the bottom of the liner with increasingly big hammers. All to no avail. Any ideas any one (other than to buy an OS)?

Denis Watkins18/02/2018 14:46:38
3806 forum posts
52 photos

In the Freezer 1st, until frozen, it should click free back in a warm room

Engine Doctor18/02/2018 18:07:10
2269 forum posts
25 photos

Hmm. What you describe sound like baked oil has set between the cylinder and case . How hot have you got the cylinder? Your hot air/ paint stripper gun on maximum should do it . Try getting it hotter , the ali case should expand more than the liner so releasing it. Never had one beat me yet .


Mr.B.18/02/2018 18:33:30
412 forum posts
26 photos

I thought that too after posting, so it's now soaking in glow fuel and I'll try again in a few days. The hot air gun on max got it too hot to hold with welding gloves. To get it hotter would require a butane torch. Or there is a small machine shop nearby by who have a bearing oven.

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