YT lists a single sleeve assembly for the M with stepped head pistons. I need a sleeve for a 3 7/8 inch bore. Theirs is listed as a 4 inch overbore. For this to fit, is the bore in the block enlarged, or is the sleeve a thinner wall? Will someone please define overbore as used here for me? Thanks.
- Thread starter Dr. Bert
- Start date
rustyfarmall
Well-known Member
The sleeve is thinner. It allows a 4 inch piston to be used versus a 3 7/8 inch without the need to bore the block. The original 3 7/8 inch piston and sleeve, as far as I know, is obsolete and not available.
Bare sleeve bore in the block is the same for 3-7/8 or 4 inch sleeves. 4 inch ID sleeve has a thiner wall. IH started selling 4 inch sleeves and pistons for those tractors back in the fifties to go in at overhauls. Not many engines left with 3-7/8 and not much demand for the 3-7/8 size. Don't think IH or others have made the 3-7/8 size for years.
Think I mentioned before that Webers Tractor works shows they have some NOS. 3-7/8 piston and sleeve sets for the tractor. Doubt they will split up a set to sell a sleeve. They may have one thats not listed on the site or know where to find one.
Think I mentioned before that Webers Tractor works shows they have some NOS. 3-7/8 piston and sleeve sets for the tractor. Doubt they will split up a set to sell a sleeve. They may have one thats not listed on the site or know where to find one.
D Slater: Thanks for the explanation. This rebuild is for a spare engine I am going to put aside and use only if the engine in my loader tractor craters, Thus feel it is hard to justify too much expense for an engine that will probably never be used.
However, I may (later) bite the bullet and buy a complete set,
However, I may (later) bite the bullet and buy a complete set,
Anonymous-0
Well-known Member
The newer piston is lighter and it will throw things out of Balance
caterpillar guy
Well-known Member
If it is a diesel. We might have an old used set of sleeves and pistons in the 3-7/8 size. Would have to look and see.
rustyfarmall
Well-known Member
It will make the engine slightly out of balance, and I would not do it if it were mine, but that is not to say it has not been done.
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