Mr.B. Posted February 18, 2018 Share Posted February 18, 2018 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)? Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 18, 2018 Share Posted February 18, 2018 In the Freezer 1st, until frozen, it should click free back in a warm room Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted February 18, 2018 Share Posted February 18, 2018 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 . E.D. Quote Link to comment Share on other sites More sharing options...
Mr.B. Posted February 18, 2018 Author Share Posted February 18, 2018 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. Quote Link to comment Share on other sites More sharing options...
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