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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF 165 Lift Cylinder Piston Rings

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Glenn Barefoot

04-14-2008 10:26:15




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I am replacing the lift cylinder and piston due to the fact the cylinder was cracked. The piston that came out of the cylinder only had one ring. It appears to be a teflon ring 1/4" tall and 1/8" thick. inside of this ring was an o-ring.
My question is simple: how does one place the new teflon ring over the piston without destroying it???
Note: the IT manual does not cover this style of replacement. It only shows the 3-ring type piston.

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Glenn Barefoot

04-15-2008 05:54:37




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 Re: MF 165 Lift Cylinder Piston Rings in reply to Glenn Barefoot, 04-14-2008 10:26:15  
I know this is a learning/teaching forum and it only works if we share our solutions with the forum. Here is what I came up with. I spoke with a john deer mechanic since this application is widly used in these tractors. He told me to drop the teflon ring in hot water out of the faucet and work, bend it so it would limber up. After a few minutes of playing with the ring, start working it around the piston. He said it would not be an easy task. He was right! I could not make it stretch enough to get it on, so I added a fixture in the equation. I found a piece of aluminum round stock the same diameter as the piston. On the end bieng placed on the top of the piston, I machined a relief that matched the top of the piston. This was to insure a perfect match so the ring would be able to slide from the fixture to the piston with ease. On the outside face of the stock, I machined a 1/8" taper across 1 1/4". Once this was finished, I had a cone shaped fixture that would fit on top of the piston. I used alluminum because it transfers heat well. I placed the fixture in the sink, turned the hot water on and started to work the ring on. Once I had it on and at the bottom of the fixture, I placed the fixture on top of the piston and the ring slid right on the piston.
The mechanic also told me to let the assembled piston to sit overnight so the ring would retract back to most of its natural state. He then told me to wrap the face of the ring with atleast 2 rounds of electrical tape to prevent damage to the ring during installation into the cylinder. He also said he used a hose clamp to compress the ring. ( this is what the tape was for) The last thing was to place the piston in the freezer for about an hour before trying to put it in the cylinder.
I plan on doing this tonight, and I will report back if the install tips worked.

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ltolson

04-14-2008 16:55:44




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 Re: MF 165 Lift Cylinder Piston Rings in reply to Glenn Barefoot, 04-14-2008 10:26:15  
Glen I was about to post the same question. I have been staring at my new piston with rubber O ring and plastic piston ring and can't figure it out. I hope someone can give us an answer. It thought maybe it needs to be heated up maybe in boiling water?



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