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HelicopterEngines Plugs Mufflers Fuel › OS 55hz main needle
03-11-2017 11:14 AM  6 months agoPost 1
datidun

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N Ireland

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Bought a 2nd hand 55,done all the bearing but noticed the main needle very hard to turn,took it out had a good clean and noticed a little bit of rubber from the o rings,so put on new o rings a and a little oil to get them smoothly,all went well and left over night,the next day the main needle is rock hard stiff to turn again,can barely turn it by hand,got it out and once again some rubber coming of the o rings,I cant figure this out as to why it becomes so stiff,the mid range is fine,my other 55 hz main needles never had this problem,any ideas.

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03-11-2017 11:57 AM  6 months agoPost 2
slickporsche

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American/Philippines

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OS 55hz main needle

I had the same thing happen on my OS 32. It is the oil or whatever you use to lubricate it. The person before you must have done the same, and whatever the lube, it attacked the O-rings. Actually, simply using some fuel might work, and allow it to evaporate leaving the oil. I also need to get to the bottom of this.

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03-11-2017 01:55 PM  6 months agoPost 3
Four Stroker

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Atlanta

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LMAOROF Apparently a silicone O-ring. Essentially nobody believes that petroleum oils, after run oils, air tool oils, hydraulic oils, etc. will eat silicone O-rings and diaphragms. Dave Schadel used to sell ULTRA OIL for YS engines - or any engine with a silicone diaphragm. Central Hobbies still sells a silicone safe after run oil.

But big boy pilots insists that they use all kinds of crap and it works fine for them - air tool oil, Marvel Mystery Oil, Mobile 1, ATF.

It is like getting Loctite in a bearing. You didn't intend to put it there. It just got in somehow.

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03-11-2017 02:25 PM  6 months agoPost 4
datidun

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N Ireland

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So its the oil then,got me puzzled hard to believe its the oil,so any idea whats the best to use,I cant see a bit of nitro fuel doing any harm,the oil I used must make the o rings swell up.

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03-11-2017 02:27 PM  6 months agoPost 5
Four Stroker

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Atlanta

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03-11-2017 07:07 PM  6 months agoPost 6
JuanRodriguez

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The Villages, Florida

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A little smear of silicone grease found at your corner auto parts store should do the trick.....

Or if you prefer buying nothing, do what has already been suggested..... use a little raw nitro fuel to lube your needle before re-installing.... the oil contained therein is silicone safe.....

Been there, done that and old enough to know better.....

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03-11-2017 07:33 PM  6 months agoPost 7
EEngineer

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TX

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"Dave Schadel used to sell ULTRA OIL for YS engines - or any engine with a silicone diaphragm."

Wow...what memories....

I used to use that stuff. I used YS 2-cycle engines exclusively in my pattern planes.

And you're exactly right. Your O-rings will be destroyed by using after-run oil that's not made for silicone diaphragms.

Also, Terry Prather used to sell some, too.

I believe that ATF(non-Ford) will also be ok.

FWIW

Logo 600SXs, 700XX, 800XX

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03-11-2017 08:08 PM  6 months agoPost 8
Four Stroker

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Atlanta

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Mobil 1 ATF will swell silicone but not dissolve it. Probably not good for diaphragms in regulators.

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03-11-2017 08:34 PM  6 months agoPost 9
datidun

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N Ireland

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Ok thanks guys,I ordered another set of rings and this time it will be silicone grease.

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03-11-2017 09:03 PM  6 months agoPost 10
EEngineer

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TX

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"Mobil 1 ATF "

I had good luck with that...."knock on balsa"...

Di you ever have to do the "spring stretch" on the pressure regulator?

Useful for when you're at a contest and you don't have a spare spring...

Didn't mean to hijack the thread....carry on

Logo 600SXs, 700XX, 800XX

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