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Crankcase dis-assembly and assembly

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Crankcase dis-assembly and assembly

Post  Paul_BB on Thu May 04, 2017 6:46 am

Hi everybody,

I have dis-assembled two reedy crankcases today and wanted to say that all went per the instructions sheet (that came with the dis-assembly tool) on the first one but that I had to heat the crankcase with a heat gun for the crank to come out on the second one.

And I have a question : what kind of lubricant should I use on the cranks during reassembly? Is the Coxlube after run oil OK? Thanks.
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Re: Crankcase dis-assembly and assembly

Post  getback on Thu May 04, 2017 7:46 am

Paul i think the Cox after run oil would bee ok , what i use is 10w hydraulic oil that i have found does good and burns off quick . Good to hear U took the CC out alot of times people dont and miss that extra drag from varnish build up . Babe Bee .049
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Re: Crankcase dis-assembly and assembly

Post  OVERLORD on Thu May 04, 2017 11:03 am

You can also use 3 in 1 oïl from the DIY. It was recommended by Cox and is still recommended by Ex Model Engines.
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Re: Crankcase dis-assembly and assembly

Post  pkrankow on Thu May 04, 2017 12:05 pm

I don't lube during assembly. It can interfere with sealants. Instead I make sure to practically flood the engine with fuel so the oil gets carried to where it needs to go after everything is done, and typically the engine is mounted.

A dose of after-run, certain air-tool oils, or ATF after assembly will have similar effects. Be careful as some oils have flame retardants added (most motor oils) which will make it very difficult to start an engine that has not been fully flushed clean.

Phil
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Re: Crankcase dis-assembly and assembly

Post  Surfer_kris on Thu May 04, 2017 2:37 pm

A proper after-run will be solvable in methanol fuel. And an engine lubricated with such an oil usually starts very easily, as the oil also helps with the piston to cylinder seal.

Using regular ATF oil is not really a good choice for an engine that you want to run. It might be good for storage, but I have never really understood why one would use an ATF oil for that.

The after-run oil I got from Bernie doesn't seem solvable in methanol (?), it might just be an ATF oil...?
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Re: Crankcase dis-assembly and assembly

Post  Paul_BB on Thu May 04, 2017 10:34 pm

getback wrote:Paul i think the Cox after run oil would bee ok , what i use is 10w hydraulic oil that i have found does good and burns off quick . Good to hear U took the CC out alot of times people dont and miss that extra drag from varnish build up . Babe Bee .049

Good point about the extra drag, I did not realize that. It is frustrating to clean up an engine thoroughly excepted for the inside of the crankcase. Then you go to bed and think "Oh my engine is nice and shiny but I know there is a lot of smut inside the crankcase". And while you sleep, you can hear in your dreams your engine telling you "Paul, Paul, I am clean and shiny but you forgot to clean my crankcase."

OVERLORD wrote:You can also use 3 in 1 oïl from the DIY. It was recommended by Cox and is still recommended by Ex Model Engines.
Thanks OVERLORD, I will use Coxlube but it's a good thing to know 3 in 1 oil was recommended by Cox.

pkrankow wrote:I don't lube during assembly.  It can interfere with sealants.  Instead I make sure to practically flood the engine with fuel so the oil gets carried to where it needs to go after everything is done, and typically the engine is mounted.  

A dose of after-run, certain air-tool oils, or ATF after assembly will have similar effects.  Be careful as some oils have flame retardants added (most motor oils) which will make it very difficult to start an engine that has not been fully flushed clean.

Thanks for the info Phil.

Surfer_kris wrote:A proper after-run will be solvable in methanol fuel. And an engine lubricated with such an oil usually starts very easily, as the oil also helps with the piston to cylinder seal.

Using regular ATF oil is not really a good choice for an engine that you want to run. It might be good for storage, but I have never really understood why one would use an ATF oil for that.

The after-run oil I got from Bernie doesn't seem solvable in methanol (?), it might just be an ATF oil...?

Very interesting Surfer_kris. I usually disassemble my .049s (excepted for the crankcase) after each flying day and reassemble them with Coxlube. I have never had any problem at start up.
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