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Farmall Cub serial numbers

A

Anonymous-0

Well-known Member
Geting ready to rebuild engine on neighbor's Farmall Cub. No serial number plate. What's the best way to proceed re: estimating parts availability and ordering info?

Nice tractor, engine is tired. What's the general procedure....pull it apart and start measuring?

Colin
 
Colin,
All of the parts will have a casting date. There could have been a lot of mixing over the years so I would check the dates on as many different parts as I could and go with that year. See the example in the picture.
If you need the letter codes, let me know and I"ll send them to you. They are probably listed on the site but I"m not sure.

Good luck with your project,

Art
a38406.jpg

a38407.jpg
 
Yes that would be the best way to go. You dont have anyidea if it has been bored and the only way to find out is remove head and pan then you can do the measurements. Same way with the bearings looking at the numbers will tell you if the crank has been ground. Mite need over size bearings both rod and main.
 
I did find the casting number on the block. So if I interpret the date, I can be sure of the internal parts? I'll plan to get into the parts and mike them. What are the big issues re: incompatibility? i.e. are all gasket sets the same? All .020 over pistons the same, etc?

Probably measure in place, then if it needs block boring, take it apart.

I'll be researching this, but any quick sources for model i.d.?

Thanks,
Colin
 
Colin: If the casting date is unreadable, there's always the engine serial number !! If Art had turned his camera a bit to the right, you'd see a smooth, machined surface about 1 1/2" square just under the valve cover with the s/n stamped in. That will help ID year as well. Go to farmallcub.com for a wealth of knowledge as well. Good luck. Craig
 
All the Cub engines from 1947-1979 were the basic C-60 engine. Anything oversize, etc. will depend on amount of wear and/or any previous work done to the engine.
 
There are very few compatibility concerns with internal parts of a Cub engine. That come to mind right now:
1) Two styles of connecting rods, require different inserts.
2) Early cylinder heads may require a little clearance relief if used with late domed pistons.
You won't know which you are dealing with until you open it up.
 
Colin,
The casting date will tell you the when the part was made but it can’t tell you how many times the parts have been modified in the last 50-60 years. There are no sleeves in a Cub so there is a good chance that it will need to be bored if you are going to put a set of new pistons in it.

For example, my Cub had two different sizes of pistons in it. I had it bored to a uniform size and now I have a little over 67 cubic inches instead of the original 60. The connecting rod and main bearings had to be turned too in order to get them to a uniform size/clearance.

The build date of the tractor always helps when you’re trying to restore one as close to original as possible. As far as the mechanical end of any restoration, I agree with what you alluded to in your first post; if you want to make sure you have the right size: measure, measure and then check your measurements.

What year do you think your Cub is likely to be?

Art
 
Thanks. I'm aware of the conrod issue and the piston top issue. Like you say, only by opening it up can I know. I hope to duplicate everything, and not interchange.
 
Art:

I found the casting date 10 28 E.

I've moved the discussion to Farmall (McCormick) Engine Rebuild. Hope to see you there.

Thanks,
Colin
 
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