Power unit

[Cubfriend]

Also some crankshafts on numbered series Cubs were not drilled for a pilot bushing. Check that out before you commit to the install.

[Ihandy]

I will check that out on the crankshaft before I commit I just may try to convert everything on the Baler engine to fit and now that you mention the pilot bushing I've had time now to look over the tractor a little more and the serial number on it says it is a 1947 serial number 4640 so maybe going with a older engine isn't a bad idea

[Cubfriend]

I will check that out on the crankshaft before I commit I just may try to convert everything on the Baler engine to fit and now that you mention the pilot bushing I've had time now to look over the tractor a little more and the serial number on it says it is a 1947 serial number 4640 so maybe going with a older engine isn't a bad idea

The newer engine would be stronger where the 47’s had some weak spots. Just have to pull the crank out and have it drilled or you may luck out and it’s already drilled. Check before you pull it apart.

[Glen]

This engine has the larger manifold for the zenith carburetor. Maybe off of a later model. The exhaust elbow turning forward is like a numbered series Cub.

Hi,
The manifold is a newer style than the first Cubs used, but I don't think it is for a Zenith carburetor.
The carb mounting flange is smaller than the flange of the Zenith carb it has on it.

Below is a page from the mid 1975 and newer Cub operator's manual showing the flanges are the same size.
That was when IH began using the Zenith carbs on Cubs.

http://farmallcub.com/rudi_cub/www.clea ... age-01.jpg

The IH carb has a smaller mounting flange, like the manifold in his pic has.

The IH carb has a 3/4" throttle valve, and someone said the Zenith has a 1" throttle valve.

I would check on your engine, and see if the carb throttle valve can open all the way.
You would need to remove the 2 bolts, and lower the carb down from the manifold to see.

Someone said on here that when he put a Zenith carb on an IH carb manifold, the valve in the carb is bigger than the hole in the manifold, and he needed to file the hole in the manifold so the valve could fully open.

[Cubfriend]

Good catch Glen, I was looking at the web cast into the manifold that the later Cubs had and overlooked the manifold to carburetor flange size. My apologies if I mislead anyone.

[Ihandy]

So I have looked over both crankshafts on my two engines.the newer one looks like it is drilled for a pilot bushing. The Baler engine already has the pilot bushing installed.I have checked out the zenith carb and the choke does move freely in the manifold . I have found two different part numbers on top of the carburetor on the inside The first one is 13794 d the second one is 71523 c-92. I need to find out more info on my Baler motor the serial number on the motor is m Cub m 33533 I'd like to know what year it is since I'm leaning towards putting that motor in the 1947 Cub