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Need lift piston advice

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8N34343

05-29-2003 09:48:56




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Can anyone give me some advice on installing the o-ring/backup gasket on the lift piston?When I removed it half the gasket was gone and the other half was between the piston and cylinder.Guess thats why the lift leaked down.How does the gasket fit over the piston w/o damaging it?All advice welcome




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Marv

05-29-2003 21:22:18




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  
The o ring goes toward the closed (front) end of the piston. According to the Ford shop manual the rough side of the backup ring mates to the o ring. Don't sweat it if you break the leather ring. It doesn't seal anything anyway. Just takes up space and cushions the o ring.



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Thanx guys,It's on

05-29-2003 13:09:14




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  



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Hobo,NC

05-29-2003 12:54:44




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  
DO NOT BOIL THE LEATHER BACKING RiNG. Makes them harder. just bring the water to a boil, remove from heat, soak leather backing ring in hot water for 20-30 min. Position the piston on the counter top with the dome side up. after the leather backing ring becomes pliable, carefully slide it down into the grove with thr rough side up put a little oil on the oring and slide it down the piston and into the grove on top of the leather backing ring. DO NOT ROLL THE RUBBER ORING
This is how Don B told me to do it. The leather backing ring has broke on mine after some use so I went back with metel rings.

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smooth or rough toward Or

05-29-2003 11:31:00




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  
which side of the leather goes toward o-ring,or does it matter?



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Rick H. Ga.

05-29-2003 12:42:40




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 Re: Re: Need lift piston advice in reply to smooth or rough toward Or, 05-29-2003 11:31:00  
I don't think it matters. I didn't notice a difference of texture on the leather O ring. Just make sure it isn't twisted or distorted. HTH. Rick



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Rick H. Ga.

05-29-2003 10:06:14




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  
Soak the leather O ring in warm water for a few minutes. This gives it a little flexibility and it will be less apt to break. The rubber O-ring goes toward the hydraulic oil side or the top of the piston and the leather O-ring goes toward the dog-bone (bottom) side of the piston. HTH. Rick H. Ga.



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Jim/41_9N

05-29-2003 10:02:30




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  
I had an NAA that the o-ring and back up leather was completely missing. Obviously the lift leaked down. Turns out that the original equipment piston in the NAA had the groove for the o-ring cut a little too far back. This caused the o-ring to actually exit the cylinder when the lift was full up. After 50 years of exiting and entering the cylinder, the o-ring and leather washer just disintegrate. Solution was to install a "new" style piston. This groove is cut a little further to the front of the piston (not by that much). This keeps the o-ring inside the cylinder. I think I have comparison pictures at home if your interested.

Not sure if this is your problem or not, just thought you might like to know.

I believe the leather ring went on first (towards the rear of the piston). I soaked mine in hydraulic fluid for a day to soften it up. It is a very tight fit. I believe some others may boil them in hot water. Check the archives for solutions. Then just roll the o-ring into the groove. It’s then a very tight fit into the cylinder also. Use some hydraulic fluid to lube it up. Oh yea, the leather ring should face a certain way (rough side vs. smooth side). Sorry I don’t remember which way.

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Barnstormer

05-29-2003 09:59:06




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 Re: Need lift piston advice in reply to 8N34343, 05-29-2003 09:48:56  
Soak the leather in water for about 5 minutes or so and gently stretch it with your fingers a small section at a time and work your way around it. It will eventually stretch enough to slice it over the piston. Once in position behind the O-ring, compress it with your fingers back to size and carefully guide it into the cylinder.
It took me longer to soak it than to stretch it and install it.

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