8n piston sleeves

(quoted from post at 03:04:59 08/02/14) Going to rebuild motor. .040 or .090 sleeves

I think it depends on what you pull out. Later model tractors had the 090 sleeves, earlier had 040. You can have the block bored to accept the 090 if you have the 040. I think most prefer the 090.

Disclaimer... I haven't rebuilt an engine myself, just been looking into doing it and trying to share what I have read.
 

I just put a new sleeve in our 51 or 52 I had ordered a 090 sleeve and it was to big got a 040 and it fit perfectly
 
Compare your serial number to the chart below and see the notes at the bottom.

mvphoto9737.jpg
 
grubbs........the original 9N/2N/8N engine block were designed for the thin 0.040 sheet metal sleeves which you "pealed" out with sharp screwdriver. I use "dry-ice" to shrink the new sheet metal sleeve for installation. One of the problems with sheet metal sleeves and the NEW chrome piston rings, they don't seal very well and turn into oil burners. That is why the thicker 0.090 castiron sleeve are popular 'cuz the chrome rings seat. The downside to castiron sleeve is the block has to be re-bored to take larger OUTSIDE diameter castiron sleeve. (piston bore is still the same) Boring a castiron block is a common engine machine shop procedure. Sometimes the "lip" at the top of block has to be re-bored for the castiron sleeve.

Surprisingly enuff, the early N-block with sheet metal sleeves were commonalty "overhauled" every winter 'cuz they'd sucked up so much sand and dirt in the cotton fields using mechanical sweeps to kill weeds. Now weeds are killed with chemicals........Dell
 
I have 3 8Ns. I have rebuilt the engines in all three. One had .090 sleeves so of course that was what I put back in. One had .040 sleeves but the cylinder walls had some deep scratches so I had it bored out and installed .090 sleeves. The third had .040 sleeves and the cylinders were perfect so I put .040 sleeves back in. All three run great. I see no difference in power or oil consumption. Maybe if I was farming and worked them hard every day it would make a difference. However, with just mowing the lawn, pushing snow and plowing my small garden I don't think I will ever see a difference.
 
Good to see you back !

Our new '48 8N plowed for 10 years with the original .040 steel sleeves still in it. Brother in law believed in preventive maintance religiously though. I rebuilt it at the Ford tractor dealership he later owned and where I worked and the sleeves were so thin at the top there were actually holes worn through in spots when I peeled them out. We put new cast iron sleeves back in. Later sold that old 8N and I sure would love to have it back but the trail is over 50 years old now.

Zane
 
(quoted from post at 07:22:14 08/02/14) I have 3 8Ns. I have rebuilt the engines in all three. One had .090 sleeves so of course that was what I put back in. One had .040 sleeves but the cylinder walls had some deep scratches so I had it bored out and installed .090 sleeves. The third had .040 sleeves and the cylinders were perfect so I put .040 sleeves back in. All three run great. I see no difference in power or oil consumption. Maybe if I was farming and worked them hard every day it would make a difference. However, with just mowing the lawn, pushing snow and plowing my small garden I don't think I will ever see a difference.

"I have heard it so many times it must be true"

The idea that 040 wall replacement sleeves won't seat modern chrome rings is just another myth. Most (if not all) N-series aftermarket .040 sleeves are not made of steel. They are made of spun cast iron as are the .090 wall sleeves. That said I think the .090 wall design is structurally more robust and less prone to "dropped sleeve" failures.

[u:62b5cb1381]Melling Sleeves[/u:62b5cb1381]

[i:62b5cb1381][color=red:62b5cb1381]Melling “HP” sleeves are made from centrifugally cast, high strength
gray iron. It is a lower carbon iron alloyed with chromium, copper,
and nickel to produce a harder (241-293 BHN) more wear resistant
surface. The average tensile strength (45,000 - 50,000 p.s.i.) is 1/3
greater than “regular” iron sleeves and nearly all O.E.M. cylinder
blocks. This proven sleeve material has been
used successfully for years in heavy-duty diesel and performance
engines to give longer life with less distortion and enhanced reliability.
Our “HP” iron is compatible with all ring materials.[/color:62b5cb1381][/i:62b5cb1381]

TOH
 
I think the two best things about going with 90s is you are less likely to damage one while installing it and like TOH said, "less prone to "dropped sleeve" failures". Other than that the engine will run the same.
 

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