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Ford 9N, 2N & 8N Discussion Forum

3 ring piston

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Rob n VA

01-05-2006 19:45:47

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What type of oil control ring does the N series use? My instructor said that up to 1955 everyone used a 1 piece oil control ring and after that everyone started using a 3 piece configuration. Is thhis right? I thought these old fords started using the 3 piece third ring long before that?

----- Rob

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Paul K in IL

01-06-2006 18:32:00

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Re: 3 ring piston in reply to Rob n VA, 01-05-2006 19:45:47

That is really hard to answer Rob because I don't think I have ever been the first to put new rings in any N tractor I have rebuilt. What they came with from the factory I have no idea but every one that I have had apart has a single 3 piece oil ring on the bottom. I have heard of 4 ring pistons but never seen one in a Ford N.

Paul K.

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FarmerDawn

01-06-2006 17:55:52

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Re: 3 ring piston in reply to Rob n VA, 01-05-2006 19:45:47

Boy, I thought for half a second I knew this one! LOL I was just about to grab my little N specs list and look up the number of rings -- and then I realized you are talking about how many pieces make up EACH ring. Is that right? Does this refer to the way each ring is made of layers so that some parts stick out past the others against the cylinder sleeve, or is this something different? (And maybe I'm so hopelessly screwed up on this you can't begin to answer my question, in which case please feel free to ignore it. [grin]) --Dawn

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Dell (WA)

01-06-2006 19:10:21

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Re: 3 ring piston in reply to FarmerDawn, 01-06-2006 17:55:52

Dawn..... ...yer gittin' smarter. 3-ring = number of grooves in the piston. And YES, the oil control ring is actually 2-thin rings seperated by lightweight wiggley wide seperator ring.

You do realize that yer cylinder walls gitt oil-squirted on them from yer hollow crankshaft as it whirrs around don't you? The piston rods have a squirt'em hole and yer piston oilrings scrape excess oil off ...but... leave a very fine film of oil to complete the top compression rings sealing.

Sometime when yer in town, stop by an automotive parts and machine shop, and asked to be shown the gutts of an engine in the back room. Most machinists would be "thrilled" to show off to a classy batty-eye lady like yerself..... ....Dell

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FarmerDawn

01-06-2006 19:16:56

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Re: 3 ring piston in reply to Dell (WA), 01-06-2006 19:10:21

LOL Classy and batty-eyed I am not, but I'll see if I can find a shop where I can get a look at the pistons. I've read about the pistons, rings, and how the oil moves along those surfaces in that Army manual. (Boy is it good!) But it seems like every time I think I might be getting something figured out, some whole new thing comes along and I'm scrambling to catch up again. Seems I found another one a' those!! :-)

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Dan

01-07-2006 07:03:03

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Re: 3 ring piston in reply to FarmerDawn, 01-06-2006 19:16:56

Here is one I "ripped" out of my Project Rustbucket (broke the area between the second and third rings off this one), and is basically the same as the 8N version. You can see the rings Dell speaks about, and the third ring closest to the base is the one with the two thin rings seperated by the wiggly ring.

Sometimes pictures say a thousand words, so look at this pic while reading Dells reply.

HTH,
Dan

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FarmerDawn

01-07-2006 09:45:59

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Re: 3 ring piston in reply to Dan, 01-07-2006 07:03:03

Ohhhh wow. Dan, that's an amazing picture! Thank you so much for posting it! I will put it together with the description Dell wrote, in my notebook. It's PERFECT.

I enlarged your photo and am comparing it to the pictures in the Army manual (that show types of pistons and rings). Would it be ok if I asked you some more detailed questions about what I'm seeing there? Also, just as a sort of preliminary question, is this a "partial-skirted" piston? (It looks just like the one labelled that way in the book, and that was something I had wondered about when I read it, what type the N's have.) Is the 8N one also partial-skirted, if so?

Let me know if it's ok to post some images to ask you to help me compare pictures. Or you, Dell, or anyone. I just want to really understand these rings now that I can compare a "real" one to the book pictures. Thanks! --Dawn

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Dan

01-07-2006 10:20:35

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Re: 3 ring piston in reply to FarmerDawn, 01-07-2006 09:45:59

Ask away - I would not say I am an expert on pistons by any means, but I got a crash course last years during my first engine rebuild.This is a partial skirt piston, and the 8Ns use the same type - only the skirts are shorter (can I say that?) from what I have seen. They help keep the piston straight in the bore as it is traveling up and down.

Here are the new pistons I put in the rebuild. If you need higher resolution pics, just let me know and I will send them to you directly.

Dan

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FarmerDawn

01-07-2006 10:49:10

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Re: 3 ring piston in reply to Dan, 01-07-2006 10:20:35

Oh yes, thank you, I would love to see higher-resolution pictures of those new pistons!!! Maybe I can see the way the rings are shaped better on a close-up I can make of the larger image. And thanks for being willing to answer questions, too!! I will put them together and get them up as quickly as I can (still probably a while, since I am the software printer tech around here and someone's having a problem with that -- I can hear my name being howled as I type this) . . . back as soon as I can . . . Dawn

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