After Run Oil?
I only have four engines all of them OS. One of them was given to me by my father who flew it for many years. All of them have logged many hours with perfect reliability and absolutely no problems. I firmly believe that OS products will last at least as long as me - perhaps longer!
Accidents happen and usually the engine takes the hit plowing into the ground. From my observations, the planes don't survive, but the engines do. These incidents are a testament to the incredible quality of these little engines.
If you happen to plow your engine into the ground, there are a couple of things you should do.
- Don't panic. OS model plane engines can take incredible abuse and still be mechanically fine.
- Don't turn over the engine. Doing this will distribute any dirt the carburetor caught throughout the engine.
- Don't disassemble the engine while it's under warranty. If you suspect any problems, return it to the manufacturer. Often times they'll inspect and make any repairs gratis.
- Do brush off any exterior dirt.
- Carefully remove any dirt in the carburetor intake. I have used a stim-u-dent tooth pick and a small water color paint brush. With the engine upside down and using a fuel bulb, lightly wash out the carburetor intake.
- Now that you have d "If the engine is not in use for a while (more than two months) remove the glow plug and rinse out the interior with kerosene (not gasoline), by rotating the crankshaft. Shake out the residue, then inject light machine-oil through the plug hole and carburetor intake, again rotating the shaft to distribute the protective oil to all working parts. Gasoline, thinner, kerosene, and light machine oil cause swelling and deterioration of plastic parts, "O" rings and fuel tubing. Use methanol for cleaning these parts."
This paragraph implies a few things. First if you're regularly flying your engine, you don't need to do any special maintenance. OS does caution about leaving any raw fuel in the engine in paragraph #3:
"Do not leave raw fuel in the engine at the conclusion of a flying session: it may cause corrosion....."
Max goes on to say disconnecting the fuel line while running the engine will take care of removing it.
Model plane fuel is hygroscopic meaning it will absorb moisture, but it also contains lubricant that will protect your motor while it isn't being used as long as you follow the admonition in paragraph #3.
After a flying session, I do put a few drops of 3-in-one oil in the cylinder, but according to Max this isn't necessary.
So we come to the questions is after run oil really necessary? The answer is absolutely not due to a residue of lubricant from the fuel being left behind, and if you lay your engine up, you still don't need it. Suppose after a flying session, you left your engine wet. In this case, would it prevent rust? It wouldn't do any good, since it's the properties of the fuel that causes rust.
The model plane industry is like any other (autos would be a good example) with a lot of enterprising individuals devising (or scheming) of ways to part you of your dollars. I notice that a two ounces of after run oil on the Tower web site cost $2.29. This would make it the most expensive oil on the face of the earth. In fact, more costly than a fine vintage wine which would do more to preserve my frame of mind than any attention to the OS!
After run oil is like additives for automobile eng "Avoid unnecessary dismantling of your engine"
Ciao,
Mr Akimoto