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Farmall & IHC Tractors Discussion Forum
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F-20 piston removal

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ToddRSC

07-11-2005 08:08:46




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I am trying to get a '38 f-20 freed up and have the pan dropped. Any suggestions on how to drop the pisons without removing the crank? I haven't taken the caps loose yet, but am hoping the crank will turn once they are off??? I don't have a good place to remove the engine and work on it, am trying to get it running without taking the block off the tractor...any help whould be appreciated...Thanks,Todd....

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JohnG(TX)

07-11-2005 11:32:17




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 Re: F-20 piston removal in reply to ToddRSC, 07-11-2005 08:08:46  
On the last Regular engine I took apart, I put diesel in the cylinders and lit it up. I let the cylinders soak in diesel and PB Blaster between each BBQ. I then used a bottle jack and steel bar to push the pistons up. Some came alone, others with their sleeves. I placed the bar on the head of the wrist pin bolt and jacked straight up.



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El Toro

07-11-2005 12:59:05




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 Re: F-20 piston removal in reply to JohnG(TX), 07-11-2005 11:32:17  
You can not beat the heat for removing anything seized. Just have to be careful when doing it.
Hal



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El Toro

07-11-2005 10:17:43




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 Re: F-20 piston removal in reply to ToddRSC, 07-11-2005 08:08:46  
That's good advice from Sloroll on being patient.
I would remove the rod caps and tap from the bottom too, not too hard you don't want to crack the block. Hal



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Sloroll

07-11-2005 09:13:06




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 Re: F-20 piston removal in reply to ToddRSC, 07-11-2005 08:08:46  
The bigest tool is patience. I have freed more old F-20s and Regulars than I ever care to remember. Some have taken up to a year to unstick some a week. Right now the Regular I have took two months and I am just now pulling the pistons. Pick your penetrant and allow to soak with the head off. Once a day whap each piston with a heavy sledge (8lb or so). A smaller hammer will brake things the big hammer moves things. DOn't keep banging on it. Just a Whap or so once a day and let the penetrant move. One day instead of hearing a whack! you'll hear a whunk! Keep tabs under the engine and watch for penatrant getting through to the floor. You know you are making headway then.

"PATIENCE" or a good check book. each can be substituted for the other. Good Luck!

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F-Dean

07-11-2005 10:32:20




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 Re: F-20 piston removal in reply to Sloroll, 07-11-2005 09:13:06  
Excellent Advice! I have found that t Railroad "Spike Hammer" which has a long "Nose," worked well for tapping the top of the piston near the sleeve wall.



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El Toro

07-11-2005 08:35:29




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 Re: F-20 piston removal in reply to ToddRSC, 07-11-2005 08:08:46  
Have you poured any transmission fluid into the cylinders? Let them soak. I used a piece of 2X2 oak to drive them out on an A. Several pistons came out with the sleeves. A torch heating them freed the pistons. You need to look
at the crankshaft to see if it's rusty and may need machining. I pulled the engine from the A.
It's a lot easier to work on. You can rent an engine hoist. I rented one from our local rental center and it came on a pallet. I ask for a 2 minute instruction on how it went together, it wasn't that hard to assemble. It was rated at 2 tons. I rented it twice, once to pull the engine
and for the installation. Hal

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R-cubed

07-11-2005 17:58:07




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 Re: F-20 piston removal in reply to El Toro, 07-11-2005 08:35:29  
I wouldn"t want to beat on the actual piston top even if you are not going to use them later. Once you break thru the crown further hammering is a lot harder. I would get a large round block of wood like a section of a oak limb about 6" long just a little smaller than the bore and flat on the bottom. (if you have flat top pistons. That way it puts the force even on the piston and is less likely to break it.

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El Toro

07-11-2005 18:13:25




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 Re: F-20 piston removal in reply to R-cubed, 07-11-2005 17:58:07  
I drove on my rods from the bottom after I had let them soak for about a week or two. Two pistons came out inside the sleeves and the other two pistons came out without the sleeves.
Had to have a sleeve puller made to remove the other sleeves. Reused the old rods on the new pistons. Hal



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