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Ford 9N, 2N & 8N Discussion Forum

? ID of hyd cylinder

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souNdguy

08-16-2004 14:15:47

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I'm picking up a brake hone, and it will work up to a 2.5" diameter. Anyone know what the ID of the hyd cylinder is?

I looked at the f0-4 and the MPC.. no luck.

thanks

Soundguy

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CraigNAA

08-17-2004 18:14:27

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Re: ? ID of hyd cylinder in reply to souNdguy, 08-16-2004 14:15:47

I just worked on mine was 2.502/piston from ford was 2.499 Craig NAA..... ..

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Fessman

08-17-2004 14:18:50

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Re: ? ID of hyd cylinder in reply to souNdguy, 08-16-2004 14:15:47

2.5" is the diameter of the cylinder bore.

Fessman

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Rob

08-16-2004 14:25:12

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right at 2-1/2 in reply to souNdguy, 08-16-2004 14:15:47

You'll be better off with the NAPA hone that goes up to 3". It's a KD with NAPA's name on it, 3-stone hone at that.
Seems a much better hone than what a lot of guys sell.
You can't hone much to take that cylinder our of spec. Piston skirt clearence is 0.0025". You hone 0.002 and you will be out of spec for sure, you hone 0.0015 and you likely be out of spec. All you can do and stay in spec is dress it up with the cross-hatch.
Get the cylinder too large and the backing ring won't be enough to keep the oring in place. Saw a top post just the other day about a guy missing the oring on his new rebuild. Don't go hone-happy.

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souNdguy

08-16-2004 14:32:56

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Re: right at 2-1/2 in reply to Rob, 08-16-2004 14:25:12

Cool. I'll get the napa hone, and I just plan on hitting it if there is any scoring.. and then just enough to round the scoring from a sharp edge to keep it from eating the oring. If there is no scoring.. I won't even hone it.

Soundguy

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don t.-9n180179

08-17-2004 05:26:22

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Re: right at 2-1/2 in reply to souNdguy, 08-16-2004 14:32:56

FWIW....My cylinder was pretty bad(IMHO), but at the time, just didn't have the coin for new. I got the 3 piece set of NAPA hones, used the longer set of stones. While I don't know what I started at/ended at, I took most of the scratches out. Replaced w/the NAA set up. My lift dropped only 1.5" over 12 hours w/my hog. MUCH better than before. Good luck....don t. ....

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souNdguy

08-17-2004 05:55:56

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Re: right at 2-1/2 in reply to don t.-9n180179, 08-17-2004 05:26:22

I get the impression that if you remove the rough edges from the scratches, the naa oring is much better sealing and a bit forgiging on imperfect bores.. as long as there are no jagged edges to tear it up. I guess the rings can only set flush with the bore.. where the oring might form slightly into a smooth'ed out groove.

Well.. along with a few other items I need.. I'm past 80 bucks for orings and such. I think my wife would freak if I also ordered an 85-90 dollar cylinder at this point.. so I'll pull mine and just have to make the call at that point. If it looks like a washed out road after a good rain.. I'll have to bit the bullet.. or slap it back together, and use it till winter, and I'll just be out the price of the top gasket when i go in to fix it 'correctly'

The whole purpose of the rebuild is to fix a blown out bottom seal.. but like everyone says.. 'might as well do this and that' while in there.. etc.

Soundguy

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Rob

08-17-2004 06:43:38

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Re: right at 2-1/2 in reply to souNdguy, 08-17-2004 05:55:56

The hydraulics outfit says they hone some just to make sure it's smooth so nothing there to damage the new oring.

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Rob

08-16-2004 14:58:38

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Re: right at 2-1/2 in reply to souNdguy, 08-16-2004 14:32:56

The rule of thumb is that new rings need a cross-hatch pattern on the cylinder wall to seat the rings. That comes from steel piston rings.
Hydraulic service guy says he hones. Myself, next time I bite the $90 bullet and replace the cylinder. Cylinder change-out is nothing, 4-bolts and a gasket. I had a hone so I didn't spend that $20.
Save the $20 and spend the $90, new cylinder has no scoring and is in spec with the new piston. Be good for another 50-years.

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gahorn

08-17-2004 11:06:16

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Re: right at 2-1/2 in reply to Rob, 08-16-2004 14:58:38

Rob, the cross-hatch pattern is for the purpose of seating internal combusion engine's piston rings...NOT for hydraulics. (an engine's pistons run up and down the cyl wall thousands of times a minute. The lift piston only does it once or twice.) A cross-hatch in the hydraulics will cut/erode the hyd. rings.
Hydraulics need a smooth surface with NO pattern at all. Use the finest grit stones you can get away with, lubricate the stones with either diesel, kero, or running water while honing. (Believe it or not, running water makes a very fine polish.)
Another trick of hydraulic mechanics is to use crocus cloth on top of the stones to polish the cyl. walls.
Remember, you're looking for a fine polish,...not a hatch pattern.

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Rob

08-17-2004 11:36:50

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Re: right at 2-1/2 in reply to gahorn, 08-17-2004 11:06:16

See that's exactly what I was thinking. That's why I went out to the local hydraulics shop and asked them about it. I did lube the 320grit stones with cutting oil, but that cylinder is a long ways from polished. Oh well, this new oring will probably last longer than I will. If it doesn't last, next time it's new cylinder and the steel ring piston, if it's still available.

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