1975 cub

Thu Dec 19, 2013 12:20 pm

Hello everyone,

Looking for a little input on a 75 model cub. This tractor is my Dad's, and he has owned it for the last 10 years, but has not got too much good out of it due to the engine smoking so bad. It is a really nice old tractor, and the engine seems quiet, makes no weird noise and carries good oil pressure, but it smokes terribly.
I plan to tear it down and re-ring and grind the valves, or what ever else it might need once we get inside the engine. Any suggestions on potential pit falls that I might encounter? I have rebuilt engines for autos, trucks, and other tractors before but have not been this deep into a cub. I plan to make this a winter project for Dad and I to work on.
Also will this tractor have the higher horsepower engine or will it be about the same power wise as the older cubs.

Here comes the sinful part. Well maybe? Would it be to horrible to strip the paint off and repaint it to the red and white color scheme. They look sharp painted this way, and Dad and I neither one care for the yellow and cream colors.

Thanks for the input,
Brad

Re: 1975 cub

Thu Dec 19, 2013 12:30 pm

Paint it anyway you want--except green.

Re: 1975 cub

Thu Dec 19, 2013 12:37 pm

69ranger wrote:I have rebuilt engines for autos, trucks, and other tractors before.
Then you will have no problem rebuilding the Cub's engine. You will need small engine tools to match the cylinder bore.

Recommend removing the engine from the tractor to work on it. Much easier on an engine stand or the work bench. Also will provide you the opportunity to inspect the clutch and throwout bearing.

Re: 1975 cub

Thu Dec 19, 2013 2:42 pm

I like the red and white colors also.

If your tractor is serial #248125 you have the later and more powerful engine. Some of the 75 models were not long stripes and some were.

Is there a lot of hours on your dad's tractor?

We love to see pictures here on the forum.

Re: 1975 cub

Thu Dec 19, 2013 3:36 pm

She may just have stuck rings. Before you tear her down, you may want to try the SeaFoam treatment. I haven't done it myself (Eddie never was a smoker), but many on this forum have said that their engines freed up nicely and stopped smoking after doing this. IIRC, the procedure is: pour one half of the can in the oil, and the other half in the gas, then work her hard for a few hours.
Last edited by bythepond88 on Thu Dec 19, 2013 5:35 pm, edited 1 time in total.

Re: 1975 cub

Thu Dec 19, 2013 4:36 pm

You should try the SeaFoam treatment first. You won't have anything to loose and might save you some work.

Re: 1975 cub

Fri Dec 20, 2013 8:36 am

I agree with what they said. :Dito:

Re: 1975 cub

Fri Dec 20, 2013 9:58 am

A compression test might provide some information also.

Re: 1975 cub

Fri Dec 20, 2013 12:52 pm

Tezell wrote:I like the red and white colors also.

If your tractor is serial #248125 you have the later and more powerful engine. Some of the 75 models were not long stripes and some were.

Is there a lot of hours on your dad's tractor?

We love to see pictures here on the forum.



my 1975 cub was made well before that serial #(like 1976 of 'em) but it's a 12 v

Re: 1975 cub

Fri Dec 20, 2013 8:55 pm

If your oil pressure is good, that's a good sign and you may get out of it pretty easy (see above). Cub engines are simple compared to most anything you have done.

The service manual is NECESSARY for anything beyond standard maintenance, the parts manual is infinitely helpful too (actually more useful).

I think the red and white Cub is truly the best looking Cub. But all the ones I use are yeller and white. I have gotten used to yeller, and they never get lost in the weeds. There are only about 300 'factory' red and white ones, all labeled 'Farmall' with 12V, the very first 12V Cubs. Boss Hog is trying to corner the market on them.

Re: 1975 cub

Fri Dec 20, 2013 9:11 pm

SeaFoam treatment works, some times and some times not. If I were to try the SeaFoam, I would have done it in summer and worked the tractor.

Winter project, go for the engine refresh.