[shuttlez]

Just wondering if there is and specific oil or lube that I need to use when rebuilding the engine. I am replacing the Piston and the piston ring along with the cylinder liner.

Thanks

[xv-townboy]

Use a little shot of tranny fluid once get it all back together

[tskca]

Rick: "tranny fluid" is this automatic transmission fluid??? It was recommended to me to use it as an after-run fluid.

I never dry start an engine. I've pumped a small amount of fuel into the plug hole and spin the engine over to remove the excess, replace the glow plug and then making sure there's fuel in the line, started the new engine.

[shuttlez]

thanks for the responses, Tranny fluid? interesting, I've also heard you can use Air Tool Oil during assembly is this true?

[sport_flying]

Air tool oil works just a well. I have found it harder on glow plugs if you use it as an after run oil.

[xv-townboy]

Transmission fluid that is correct..Same as whats in your afterun oil ..The airtool oil works good as well..

[Cougar429]

For assembly you want an oil that has a good film strength and lube qualities as it will sit there, then protect the parts when starting. If you want to go full tilt there are assembly oils at any auto parts store that sells engine bits, although you would get quite a bit more than you need for your small engine.

I've run a 50/50 mix of ATF, (dexron tranny fluid) and air tool oil for 25 years as an after run treatment and rarely kill glow plugs. This year I added a bit of metal conditioning oil I had into the mix as it increases the film strength. That mix would work just as well as an assembly lube.

The key to after run is to try and burn off as much fuel as possible. Just shutting the carb to kill the motor is probably the worst case, as it leaves a lot of unburnt fuel and nitro inside the motor, where it mixes with airborne moisture into a corrosive. To help combat that I add the after run oil, then always plug both the carb and exhaust outlet at the end of every flying session.

p.s. Air tool oil is identical to turbine oil, a very high grade lubricant.

[Guest]

I don’t understand putting something in an engine that normally does not enter as part of the normal combustion process. Why not use the same oil as is used in the fuel. This way it would be totally compatible. For instance the Klotz Techniplate oil in either pure synthetic or castor/synthetic blend. This is the same oil used in many of the quality fuels for our aircraft. I have used this as after run oil for ages without any problems.

http://www.klotztechniplate.com/

[shuttlez]

Thanks for the Response it will help alot

[xv-townboy]

Originally Posted by Propworn

I don’t understand putting something in an engine that normally does not enter as part of the normal combustion process. Why not use the same oil as is used in the fuel. This way it would be totally compatible. For instance the Klotz Techniplate oil in either pure synthetic or castor/synthetic blend. This is the same oil used in many of the quality fuels for our aircraft. I have used this as after run oil for ages without any problems.

http://www.klotztechniplate.com/

He was wondering what would be good for a first start up oil during/after a rebuild.Transmission oil is readily available and cheap .No need to overthink it..
As far as afterun goes i never use it.The green coolpower leaves a nice oily residue.I've had motors sit for well over a year with no rust and thats in the basement.Just a nice green oily green residue