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Farmall & IHC Tractors Discussion Forum
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F-20 Engine Assembly

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SproutW

03-12-2007 08:12:09




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I'm putting my old F-20 engine back together this week. I bought an old 4" piston, sleeve and ring rebuild kit. The pistons now stick up above the deck about a half inch. I've done some minor math and measuring and think I have enough room for the pistons and valves. I take it this was some after market power up kit that was offered. Anyone installed a similar kit? What torque spec do I use for the head bolts. I was thinking 90 ft. lbs. but my memory is fuzzy and I can't remember. Let me know what you guys think. Thanks.

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Janicholson

03-13-2007 06:42:40




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 08:12:09  
Ignore my posts below, I evidently have no idea what you are looking at, new to me. Sorry, JimN



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SproutW

03-13-2007 08:47:40




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 Re: F-20 Engine Assembly in reply to Janicholson, 03-13-2007 06:42:40  
Check out my new post with pictures. That will explain things better then I can by words.



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ET

03-12-2007 11:57:29




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 08:12:09  
My F20 has pistons that stick up just like yours. They were in the engine the last time it ran so I was not to worried about them, but I found it interesting how far they stuck up. The heads on those tractors have a huge chamber in them so there should be no problem.



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SproutW

03-12-2007 12:31:11




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 Re: F-20 Engine Assembly in reply to ET, 03-12-2007 11:57:29  
Thanks. Were your pistons domed or flat tops. My pistons are flat tops but stick up past the deck a half inch. I've seen high altitude pistons that were domed but this is my first experience with a flat top piston that sticks up past the deck.



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ET

03-13-2007 04:53:53




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 12:31:11  
My pistons are flat tops like yours. I would say they stick up about a quarter of an inch but I havn't measured them.



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the Unforgiven

03-12-2007 12:45:21




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 12:31:11  
I have used them, thought they looked funny too. Half an inch sounds like an awful lot, but they do have a huge chamber. With a 4 inch piston and high compression it should be a good runner.



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SproutW

03-12-2007 13:09:39




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 Re: F-20 Engine Assembly in reply to the Unforgiven, 03-12-2007 12:45:21  
I eye balled the half inch and I'm thinking it's less now that I'm lloking at a ruler. I wish I would have measure the darn thing before I put the head on. I'm sure the measurement was at least a quarter inch with the head gasket on the deck. Your pistons were the falt top design? Maybe I'm worrying for nothing. Thanks



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the Unforgiven

03-12-2007 16:18:16




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 13:09:39  
Yeah, flat tops. Looked just like the pistons were coming up to far.



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the Unforgiven

03-12-2007 12:52:23




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 Re: F-20 Engine Assembly in reply to the Unforgiven, 03-12-2007 12:45:21  
And I had 75lbs. for the head bolts stuck in my head, not sure if that is right. Should be comparable to an M, I think it uses the same size bolt? I broke one one the first F20 I worked on, they can suck.



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Janicholson

03-12-2007 11:16:04




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 08:12:09  
Sprout,
If the pistons are domed, and the only part of them sticking up are the domes, you are probably OK. But if the round part of the piston is sticking out they are the wrong pistons for sure.
Put a 1/8" thick layer of modeling clay on the heads of both valves in one cylinder. Put the old head gasket on the block (dry). Put in 4 head bolts at that cylinder, and tighten them 1/4th the normal torque. Assemble the valve train using only those two pushrods on that cyl. Adjust the rocker arm about three turns out from where it was when disassembled. :::then::: Hand turn the engine very carefully feeling for resistance as it is turned. Make sure it rotates 2 turns to assure both valves are actuated. If no resistance (contact) is felt, adjust the valves in one turn and do it again. if no problem, adjust the valve to specification, and turn again.
Then dissassamble the head and look at the clay. If it is unmarked, yopu are good to go. If it is dented, and in no place closer than .050" I would go ahead with assembly. If it was pinched to less than that I would cut a smoothed edge relief notch in the piston, with a dremmel tool, where it touched to assure no interference. I hope this helps, JimN

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SproutW

03-12-2007 11:54:53




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 Re: F-20 Engine Assembly in reply to Janicholson, 03-12-2007 11:16:04  
My pistons are not domed but stick up straight. Is that in itself going to be a problem.



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Janicholson

03-12-2007 20:45:02




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 Re: F-20 Engine Assembly in reply to SproutW, 03-12-2007 11:54:53  
I think it is a very big problem. I am not an F 20 person, but I believe they had pistons that came only to the top of the cylinder. the heads were not designed to allow the piston to enter the chamber at all. If it is together, place the head on the top and you will see what I mean. Piston Pin placement (location) in the piston is a critical element. Look at the original pistons (I hope you have them) and check the distance from the pin boss to the crown (top of the piston) then compare it to one of the "new pistons". if they are the same, then the rods are possibly different, and/or the crank is a "stroker" adding piston travel. I think they are the wrong pistons, where did they come from? JimN

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