'45 A motor question

[grandpa Love]

When we pulled the head we found Fire Crater pistons. Nice surprise . The inside of the sleeves measures 3.25 top and bottom. My understanding is originally it would have been 3 inch. Over bore would be 3-1/8. To get the 3-1/4 pistons would the block have been bored? Or is the sleeves thinner allowing it to fit ?Strangely the block serial number and the tractor data plate numbers match. Showing it's the original block. Any insight?

 

[Richard G.]

When we pulled the head we found Fire Crater pistons. Nice surprise . The inside of the sleeves measures 3.25 top and bottom. My understanding is originally it would have been 3 inch. Over bore would be 3-1/8. To get the 3-1/4 pistons would the block have been bored? Or is the sleeves thinner allowing it to fit ?Strangely the block serial number and the tractor data plate numbers match. Showing it's the original block. Any insight?

That will be a powerful hoss!

 

[old]

When we pulled the head we found Fire Crater pistons. Nice surprise . The inside of the sleeves measures 3.25 top and bottom. My understanding is originally it would have been 3 inch. Over bore would be 3-1/8. To get the 3-1/4 pistons would the block have been bored? Or is the sleeves thinner allowing it to fit ?Strangely the block serial number and the tractor data plate numbers match. Showing it's the original block. Any insight?

I'd say thinner sleeves since it is a wet sleeve engine boring causes problem due to lack of metal at the bottom of the sleeves where the O-ring is

 

[560Dennis]

interesting find.
whats The number on the engine block behind the oil filter canister?

 

[grandpa Love]

interesting find.
whats The number on the engine block behind the oil filter canister?

I would have to go back and look , but it's the same serial number as the data plate under the seat

 

[560Dennis]

I would have to go back and look , but it's the same serial number as the data plate under the seat

Im really interested in how they got those pistons and sleeves in there , not familiar with the A blocks . If true ly and A matching block numbers there was something machined to accept it and how the o ring seals were modifies and o rings were recut . When I’m deciding on a kit one of the first things I read is what engine block number I have and to match what block revisions goes with the engine overhaul kit .
Just curious about

 

[teddy52food]

I would have to go back and look , but it's the same serial number as the data plate under the seat

If the block casting # ends in 898 it is a 31/8 std &31/4 overbore block.

 

[Jim Becker]

The lower bore on the original A engine was 3-5/16. If a sleeve with a 3-1/4 bore was fitted, it would only leave 1/32 available for the thickness of the sleeve at the lower bore. I have trouble imagining that would hold up (granted, no compression pressure that low on the sleeve). I have heard of people over-boring the lower bore on those blocks, but never heard how it worked out. For the C-123 3-1/4 replacement sleeves to fit, it would need to be bored to 3-7/16, which really isn't much of an oversize. The other possibility is that the tractor actually has a replacement block. Replacement blocks had no engine number stamped into them. Anyone using those blocks could have stamped the block using the number from the old block. Checking for a later part number cast into the block, as suggested by teddy, would confirm that. Any of the later replacement blocks would also have a place to mount a hydraulic pump.

 

[grandpa Love]

When we pulled the head we found Fire Crater pistons. Nice surprise . The inside of the sleeves measures 3.25 top and bottom. My understanding is originally it would have been 3 inch. Over bore would be 3-1/8. To get the 3-1/4 pistons would the block have been bored? Or is the sleeves thinner allowing it to fit ?Strangely the block serial number and the tractor data plate numbers match. Showing it's the original block. Any insight?

More pictures

 

[Janicholson]

More pictures

C-123 for sure. the numbers are hand stamped, which is OK, but not original. All good Super C+ power. Jim

 

[grandpa Love]

C-123 for sure. the numbers are hand stamped, which is OK, but not original. All good Super C+ power. Jim

Casting code is O.....'45 ?... No hydraulic pump spot?

 

[Farmalldude45]

More pictures

What am i not seeing? Looks like the calipers are reading 3-1/8.

 

[crsutton81]

When we pulled the head we found Fire Crater pistons. Nice surprise . The inside of the sleeves measures 3.25 top and bottom. My understanding is originally it would have been 3 inch. Over bore would be 3-1/8. To get the 3-1/4 pistons would the block have been bored? Or is the sleeves thinner allowing it to fit ?Strangely the block serial number and the tractor data plate numbers match. Showing it's the original block. Any insight?

Looking through my SA parts catalog for what it's worth, there are several options for thinwall sleeves to work in conjunction with firecrater pistons. It appears to me the cylinder bores could be anywhere from 3" to 3 3/16" based from the notations of what material piston is used for the altitude and fuel type. Got me wondering if they may have went a bit further and mixed and matched parts from a 123 engine ?

 

[Jim Becker]

Okay, from the new pictures it is clearly the original block. But now I am on the same page as Farmalldude45. I read the sleeve bore as 3-1/8, not 3-1/4. Thinwall sleeves for a 3-1/8 bore in that block are common, in fact about all you can find now.

 

[grandpa Love]

What am i not seeing? Looks like the calipers are reading 3-1/8.

Looks like the edge is on 1/4??? Clearly past the 1/8....... edit, nevermind,see my new post

 

[grandpa Love]

Okay, from the new pictures it is clearly the original block. But now I am on the same page as Farmalldude45. I read the sleeve bore as 3-1/8, not 3-1/4. Thinwall sleeves for a 3-1/8 bore in that block are common, in fact about all you can find now.

Why am I ready 1/4??? Clearly the edge is on 1/4??.....spot on the line........... never mind....see my new post

 

[grandpa Love]

When we pulled the head we found Fire Crater pistons. Nice surprise . The inside of the sleeves measures 3.25 top and bottom. My understanding is originally it would have been 3 inch. Over bore would be 3-1/8. To get the 3-1/4 pistons would the block have been bored? Or is the sleeves thinner allowing it to fit ?Strangely the block serial number and the tractor data plate numbers match. Showing it's the original block. Any insight?

Well .....I did what any good carpenter should do, I used a measuring tape. It's 3-1/8. Now I have the wrong rings on the way.

 

[Farmalldude45]

Why am I ready 1/4??? Clearly the edge is on 1/4??.....spot on the line........... never mind....see my new post

The numbers are to the left of the line. See "0" on left hand side. Otherwise, you wouldn't be able to read the applicable number. It would be covered up.

 

[560Dennis]

Take your time you’ll get going

 

[grandpa Love]

Take your time you’ll get going

Ordered a different set of rings. Now we wait