F-20 Piston Installation

doehmke · Sep 23, 2010

What's the recommended way to install F-20 pistons? I have a set of used sleeves bored out to accomodate the original 4" pistons. They're pretty thin at the bottom of the skirt, so seem fragile for installing from the bottom if a ring gets hung-up. Also, is there a special type of ring compressor and/or technique to go from the bottom? Can you fit a mallet or hammer handle inside the block to tap them in? Or can they go in from the top w/4" cylinders? It seems like the crank end of the connecting rods wouldn't fit through the cylinder for standard size, but hoping that works for the larger 4" cylinder. The tractors is 3 hours away, so I'm going off memory for sizing things up.

Charlie M · Sep 23, 2010

I don't know about an F20 but my W30 pistons had to come out the bottom. I used the same ring compressor for inserting from the bottom as from the top.

randy hall · Sep 23, 2010

the original size was 3.750 the oversize is 4" . the original have to go in from the bottom. the oversize can go in the top.

F-Dean · Sep 23, 2010

If your are worried about pushing the piston with new rings up from the bottom, push the piston without rings up from the bottom up as far as it will go. Then install the rings above the block and use a ring compressor as you tap the piston down into the block.

robgIN · Sep 24, 2010

Randy is correct with a 4.00 inch bore the hole is big enough for the connecting rod to fit through and can be installed from the top.

F-20 Piston Installation

doehmke

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Charlie M

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randy hall

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F-Dean

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robgIN

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