Nitrodan73

My Feedback: (12)

I was told by someone today that air tool oil used as after run oil in a YS engine is grounds for trouble. The engine has been in storage for a couple of months and is pretty new. It has never been flown. Should I just change all the silicone parts now or wait until they fail? I would rather change everything now so I don't have to worry about it. Especially now because I haven't flown it yet and so it has never been tuned all the way. Please help![&o]

krayzc-RCU

My Feedback: (31)

bummer i am hear listening

Bass1

I heard the same thing years ago. Something about the petroleum distillates attacking the silicone parts/seals in the pump. Same goes for OS engines with pumps. So I use Cool power Synthetic Model engine oil in my pumped engines for storage with good results. I have used marvel mystery airtool oil in in non pumped Saitos with no problems. Why don't you soak a piece of silicone tubing (standard glow fuel tubing) in a jar of airtool oil and see what happens?

Troy Newman

As stated in the manual for the engine:

"Important: Silicone rubber is used in the YS engine. Only use glow fuel or methanol for cleaning. Gasoline and other volatile solutions will damage the silicone if used. Do not use petroleum based oils as after run lubricants as they can damage the silicone."

So if the air tool oil is all synthetic you will be fine. If an only if the air tool oil used was all synthetic. If it doesn't say its all synthetic then its NOT.

If it has any petroleum based products in it you YS engine is in need of serious service work. There are many many silicone seals in the engine. Depending on the engine there are about 8-12 silicone o-rings. Also depending on the engine there is a silicone diaphragm, and plunger that are in the regulator. If any of these parts is damaged the engine will not run properly and could cause mechanical damage.

The engine will need to be completely disassembled and each part cleaned with soapy water and flushed with methanol. Any petroleum residue that is left in the engine will dissolve the silicone parts and damage them. So it will need to be completely cleaned. This includes flushing out the bearings and all the little nooks and crannies.

For this work you will be better off just sending it to YS parts and Service. They will be able to take it apart clean it all up and return it to you properly re-assembled.

www.yspartsandservice.com

The good news is this time of year is the slow time for engines repairs and they should be able to get it back to you fairly quickly.


Troy Newman
Team YS

Bass1

Well, There is the difinitive answer that Nitrodan didn't want to hear.[]

krayzc-RCU

My Feedback: (31)

maybe he has the good stuff

kochj

I used to be a knowledable do-it-yourselfer- rc engine guy........
Until I decided to teardown my Brand New DA50 and then after polishing the ports and putting it back
together, I scored the piston/cyl wall...

I now send any engine in that cost more than 200$ to be serviced......

I learned the hard way.....

When in doubt, send it in to have the ys team to look at it.....
You will be much happier in the end....

JMHO
Justin.

Nitrodan73

My Feedback: (12)

You guys are right! I didn't want to hear that but I am afraid I am better off being on the safe side. My air tool oil does not say synthetic on the bottle but I will call them just to make sure. The reason I used the air tool oil was because I was told to put it in my Saito. I figured I was doing the YS a favor. I'm an idiot. Does anyone know what this is going to set me back? I figure at least $30 in gaskets and stuff. Then time to clean and install? Whew! There goes my new Sig P-51 money! I guess some lessons are learned the hard way!

Troy Newman

The air tool oil is a fairly in expensive oil and its not going to be synthetic. If it was they would say it right on the bottle. The Saitos are fine with it because they don't have the silicone parts.

As for costs you will have to contact Richard at YS parts and Service. He gets about $35 for the labor and then you'll have about 25-30 in parts. So its not that bad.

The good news is they will run the engine when done and You'll know it has the mixture settings close.

Troy Newman
Team YS

Nitrodan73

My Feedback: (12)

That is about what I estimated the costs at. I called the oil manufacturer and it is 100% dinosaurs! Dang!

rmenke

My Feedback: (13)

ND: Good golly miss molley, let us keep life as simple as possible. Simple strokes for simple folks, etc. Now, you can use Super tiger recommended after run oil (50% marvel mistery oil 50% auto tranny oil) guaranteed to work for ST, but will gum up YS, OS and a few others, or get some 3 in 1 oil that will do the same thing, or just make life simple. Buy some YS after run oil, or what ever they recommend. Can be used in all the rest with no problem. I have been using "Ultra Oil" for years with great results, shows on the label YS and OS compatable. Best part, oil is reasonable, cheaper than 3-1 would be. Get at 775-265-7523, Performance Specialities (Nelson engines). Phone number may have changed. Get the 3 bottle pack, will last you for years, great stuff, honest. Another life simple thingy. You can use Power Msster 15% glow fuel on your YS engines with no problems with good power and transition. Also can use same fuel with all your glow engines except for 5%or no nitro required units. Its also all you need for good high rpm engines such as Jett & Nelson. If you run some Webras, add 2 oz. castor, they thrive on the extra oil for some strange reason. ENJOY

Nitrodan73

My Feedback: (12)

Rmenke,

Thanks for the advice. I sent the engine into YS for a check up. If it is damaged, they will replace whatever gaskets I may have screwed up. I will purchase their recommended after run oil when they send the engine back to me. Thanks for all of your guys input!