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Farmall & IHC Tractors Discussion Forum
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F-20 VALVE AND PISTON FYI

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BIG BORE 20

01-09-2008 19:37:33




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Years ago I had a valve stick in a f-20 after it setting over the winter. I broke the stem of the valve off trying to free it. Not wanting to spend any money for a head gasket set I opened the port hole in the side of the block dropped the piston out changed the valve with out pulling the head. On f-20"s with std. bore the sleeves are tapered, so the pistons can be installed and removed from the bottom with out using a ring compressor. I had an old timer tell me he put in a new set of rings in the field one time. I remembered that trick and used it on that valve. I hope this will help someone the the future. I"m getting old enough now the term old timer fits me. Please share your thoughts.

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Kevin LA-CA

01-10-2008 18:51:59




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 Re: F-20 VALVE AND PISTON FYI in reply to BIG BORE 20, 01-09-2008 19:37:33  
Ron - I think this is true only if you have the Regular with the 3 7/8" (?). The F-20 with 4" bore has enough clearance for the crank end of the rod.

.. but I have only worked on the Regular engine.

kevin



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russ hamm

01-10-2008 11:30:57




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 Re: F-20 VALVE AND PISTON FYI in reply to BIG BORE 20, 01-09-2008 19:37:33  
I have had some of the three piece oil rings that gave me problems. So on some we installed the piston without rings, pushed it up as high above the block as it would go, stuck a screwdriver in the wrist pin hole to keep it from dropping, and installed rings above the block. Then compressed and tapped down into the sleeve. I have a lot of luck with installing the single piece oil ring from below, but that durn three piece one has let me down a time or two. Now, replacing a valve from below, i have heard of that before, and it does work. We even replaced a broken skirt piston and honed the cylinder from below on a 22-36, but we did pull the pan.

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Scott Rukke

01-09-2008 19:59:06




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 Re: F-20 VALVE AND PISTON FYI in reply to BIG BORE 20, 01-09-2008 19:37:33  
Funny you mention this now. Saw a fellow a week or so ago on here that mentioned he went out and bought a ring compressor and ridge reamer to put new rings in his F-20. I knew about the tapered sleeves as I had just put new rings in and honed the cylinders but I didn't have the heart to tell him about the tapered sleeves. I've done many car engines and I was pleasantly surprised at how easy the F-20 was to work on. The pistons went back in from the bottom with new rings very easy.

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Ron Weber

01-10-2008 17:05:21




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 Re: F-20 VALVE AND PISTON FYI in reply to Scott Rukke, 01-09-2008 19:59:06  
IF my memory serves, you have to put the pistons in from the bottom if you have the rods on because the rods are bigger than the bore. Right? I have done so many engines it's all a blurr..... or is it CRS?



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