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Engine basics => Engine set up tips => Topic started by: Shawn Kuntz on February 27, 2007, 09:19:01 AM
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I have two old Johnson 35's that were given to me years ago. I believe they both are stuck but should turn over after they are cleaned up. One is green annodized and the other is the natural metal color. I did have the green one running once but remember that it did not rev real high. Does anyone have any experience with these? What can I do to get at least one of them running? I would really like to build a 50's era stunt model and power it with one of these. Help please!
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Hi Shawn,
Like I said in the other post, make sure the wrist pin is not stuck.
Use a castor oil fuel of at least 25% content and 5%-10% nitro.
Bill <><
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I got mine to run that I bought in the early sixties by using the crock pot method. It run well on a 9x6 turns around 11K, but does have a fair amount of blow by coming out the front. Others have said that this is not uncommon. Mine too was stuck solid, but the crock pot and Prestone antifreeze did the trick.
Andy
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I got mine to run that I bought in the early sixties by using the crock pot method. It run well on a 9x6 turns around 11K, but does have a fair amount of blow by coming out the front. Others have said that this is not uncommon. Mine too was stuck solid, but the crock pot and Prestone antifreeze did the trick.
Andy
Hi Andy,
Hiw much, and what type, of oil are you running?
Bill <><
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FWIW----I would think TWICE about using the crock pot on the green one, according to the book (AMEE) they are not annodized they are painted green
Just my 2 cents.
"Billy G" H^^
Thanks Bill added the word twice after you posted
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If the crockpot doesn't work, and the piston is up far enough to close the exhaust port, pull the plug, fill the cyllinder with WD-40 or similar product, install the plug, then play a torch gently over the cyllinder fins. The expansion of the oil should push the piston down.
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FWIW----I would think about using the crock pot on the green one, according to the book (AMEE) they are not annodized they are painted green
Just my 2 cents.
"Billy G" H^^
From all I have heard, the Johnsons were painted. If you want to keep that green finish intact, then it can be disassembled by hand, with patience. ;D
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I will do this one by hand. Thanks.
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I have two old Johnson 35's that were given to me years ago. I believe they both are stuck but should turn over after they are cleaned up. One is green annodized and the other is the natural metal color. I did have the green one running once but remember that it did not rev real high. Does anyone have any experience with these? What can I do to get at least one of them running? I would really like to build a 50's era stunt model and power it with one of these. Help please!
Shawn are these motors new as is not run, or have they been ran before?
Randy
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The motors have been run before. I had the green Johnson running when I was a kid but never flew with it.
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The motors have been run before. I had the green Johnson running when I was a kid but never flew with it.
Hi Shawn
If the motors do not have a lot of burned on castor on them and are fairly clean, I would clean them up with wd 40 and fuel. I am sure this will work for you, if they are heavy coked with burned on castor DO NOT crock pot them, you can ruin the compression when all the coked on castor comes off of teh piston\sleeve
If on the other hand they have clean piston\sleeves do not use all castor fuel in them, They will run better and last longer if you use a castor synthetic blend , Use something like 25% castor 3% synth or 20 castor 7 synth 10% nitro
REgards
Randy
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Shawn, a (trick) that I have used to free up engines that are (stuck) due to castor oil is to mount the engine on a test stand, remove the plug and squirt a little fuel or pure methanol into the cylinder and fill the venturie as well,bolt a prop on. Take a heat gun and warm the engine up. Most of the time, you will be able to tell by gently wiggling the prop if the crank is free or stuck, if there is no movement of the prop, then concentrate the heat on the main bearing area and keep a little pressure on the prop. As soon as you feel a little movement at the prop, then move the heat gun so that it is directed into the exhaust port until you feel the piston let go.....I have used this methode on countless (stuck) engines and it works in 98% of the cases...I have only had 2 engines that this methode did not work on and an over night stay in the crock pot in a mixture of half water and half prestone freed those two right up...
One was a McCoy .35 and one was a K & B Torpedo Green Head .45 and both are still running and making noise just fine today.....although, the red and green are pretty much gone from the heads.:-) H^^ Cheers, Phil
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Shawn
I use Sig 25% all castor and 5% nitro fuel in my Johnson, old Fox 36x, OS MaxIII and new Fox 35 engines. They all seem to run well on this blend, I should also mention I fly near sea level here in So. Cal.
Andy
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FWIW... the green Johnson is probably closer to an Orwick than Johnson... Johnson bought out Henry Orwick and the first Johnson's were not changed very much, other than adding the name... Both are fine engines!!
Later
Jim
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I need a piston and sleeve for a Johnson Stunt Supreme does anyone have one?