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04-28-2011, 09:19 AM | #1 |
RCC Supreme Contributor
I am: Cliff S
Join Date: Feb 2007
Location: Belleville Ont.
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Hitec, Futaba - FM # of RCs: 10
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Posts: 3,202
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Ignored YS91
I was asked about a YS91 that had been sitting a while and now has no compression. I have bought many engines off of ebay and they come from new condition to totally seized. most of my experience comes from 1957 to 1980, then I came back in 2007. I am an aircraft mechanic with 55 years experience.
The after run oil I use is regular aircraft synthetic turbine engine oil MIL-L-6081C. One of the engines I picked up was an old Veco .45 ser#158. It is in excellent shape except leaky compression and rough bearings and hard to turn over. I put some of my oil in it and stuck it on the back of the shelf. a few months later I oiled it again and spun it back and forth a few times, it seems better. More time passes and I am going around oiling my engines again. I do the Veco and it now is free, good compression and smooth bearings. The second case is a SAITO .90 three cylinder radial. It had no compression on one cylinder. What I did was turn the engine over at a reasonable speed by hand with the plugs in and listen to each exhaust port, then the crankcase breather and the intake port. I determined that #1 cylinder was the problem. I found that the intake valve open when I removed the rocker cover. A little oil and a gentle nudge with a small screwdriver and away it went. After a run I checked the rocker arm and there was no oil in there still. My question is what do you guys use and does it work. I do not want to drown this engine in anti freeze cause there is so many places it can get trapped.
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Kip "If my being here has made your day a little more pleasant then I have done my job" Red Skelton 1913 - 1997 (famous Comedian) |
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