Plug on engine block

Thu Jun 26, 2014 9:29 am

On my 1959 Lo Boy the engine has a 1/2 inch plug just to the right of the oil filter housing near the top of the block. It goes in to the water jacket. All of my other cub engines don"t have it. The engine serial number is CUBM227983 V. What is it used for?

Re: Plug on engine block

Thu Jun 26, 2014 10:14 am

What is the PN and casting date of the engine casting (below the carb)? The engine SN lines up with what should be on a 1959 tractor, but I believe the block was originally intended for marine use, or a previous owner drilled and tapped for the plug for some other reason.

Re: Plug on engine block

Thu Jun 26, 2014 10:33 am

The part number is 261341R7 and the casting code is 7 17 E . The block is build up in the casting where the plug is tapped in. I would post a picture if I could figure it out.

Re: Plug on engine block

Thu Jun 26, 2014 10:53 am

In the HOW To Section there is how to post pictures, but in the mean time email it to me and I will post it for you.
ejpuckett@centurytel.net

Re: Plug on engine block

Thu Jun 26, 2014 3:42 pm

The engine in my Cub has that. But, it came out of a power unit. I use it for a temperature gage. Ted

Re: Plug on engine block

Thu Jun 26, 2014 9:28 pm

here are the pictures.
Image

Image

Re: Plug on engine block

Thu Jun 26, 2014 9:41 pm

Engine oil gallery plug. Been replaced. The oil gallery feeding the oil filter housing is directly under the plug.

Re: Plug on engine block

Thu Jun 26, 2014 10:46 pm

The large square plug does not connect into the oil galley, it does connect to the water jacket. I do not know its original purpose for this engine as it has a different PN than the engines Palmer used for their marine use that had the same casting and plug in them. Is your PN stamped into the block casting or is it raised letters cast there? Is the tractor all original or can you tell if major parts have been replaced? If you can, could you provide the tractor SN and the casting numbers from other components? Are you absolutely sure that the 6 in the block PN you listed is not actually a 5?

Re: Plug on engine block

Fri Jun 27, 2014 9:34 pm

The cub lo boy serial number is 11434 and the casting part number on the block is raised number in the casting and is a 5 not a 6 251391 R 7 (Stand Corrected). I believe the engine is original to the tractor.by my inspection. If you look at the above pictures you can see Federal Yellow showing through and all the rest of the tractor has the same problem. So this was a 1959 yellow cub from the factory. The wagner 45 loadert parts have the first coat off white with federal yellow the second coat and years later somebody painted the whole tractor red. The tc has 7-17-E casting date code(same as engine). What are the odds of having a changed engine with the same date code as the TC. Other date codes torque tube 7-30-E, head 7-2-E. Was it common to paint the loader the same color from the factory.

Re: Plug on engine block

Sat Jun 28, 2014 10:00 am

Wagner was an aftermarket. They made similar style loaders for most tractors back in the late 40s up through I think the 60s. All of them I have seen were red, though they may have sold them in other colors.

Re: Plug on engine block

Sat Jun 28, 2014 2:43 pm

I also believe from looking at the numbers that the engine is original to the tractor. What I can't answer is why yours was cast with the water outlet in front of the oil filter housing. Typically, when such a change happens to a part, the revision number would change to account for the change in the piece, or if it was a drastic change, the entire PN would differ. This did not happen for some reason on your block, as it shares the same PN and revision number as a typical Cub engine from that era. Very interesting to say the least.
In case you didn't know, the "V" in the engine SN denotes "RotoValves".

Re: Plug on engine block

Sat Jun 28, 2014 5:29 pm

Temp gauge?

Re: Plug on engine block

Sat Jun 28, 2014 8:29 pm

i have a block that has a sending unit there and i think it was a power unit motor. i 'll post some pics of it if you guys would like it

.

Re: Plug on engine block

Sat Jun 28, 2014 8:40 pm

Rob in NH wrote:i have a block that has a sending unit there and i think it was a power unit motor. i 'll post some pics of it if you guys would like it

.

Yes, I would like to see that, along with the numbers off the block if at all possible! :D

Re: Plug on engine block

Sat Jun 28, 2014 9:20 pm

RaymondDurban wrote:The large square plug does not connect into the oil galley, it does connect to the water jacket. I do not know its original purpose for this engine as it has a different PN than the engines Palmer used for their marine use that had the same casting and plug in them. Is your PN stamped into the block casting or is it raised letters cast there? Is the tractor all original or can you tell if major parts have been replaced? If you can, could you provide the tractor SN and the casting numbers from other components? Are you absolutely sure that the 6 in the block PN you listed is not actually a 5?


Raymond,

I have a NOS block (complete with a coat of cosmoline) that has the plug. After church tomorrow I will get the serial number, PN, Casting Code and, possibly, some pics for you. My understanding when I purchased this was that it was for use in a marine application.

Bill