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Power unit

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Ray 59
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Power unit

Postby Ray 59 » Sun Jul 21, 2013 9:53 pm

What is the difference between the engine in the tractor and the one used in the power unit? Ray
1948 Farmall Cub 1949 Farmall Cub 2 1950 Fafmall Cubs 1951 Farmall Cub 1957 Farmall Cub1958 230 Farmall 1957 350 Farmall 1986 White FB16

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Bob McCarty
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Re: Power unit

Postby Bob McCarty » Sun Jul 21, 2013 10:15 pm

The main differences that I am aware of are all external, carb, flywheel, radiator. There are probably more.

Bob
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ScottyD'sdad
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Re: Power unit

Postby ScottyD'sdad » Mon Jul 22, 2013 7:04 am

Governor is different, too, I believe. Basic "short block" is the same. Ed
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Clark Thompson
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Re: Power unit

Postby Clark Thompson » Mon Jul 22, 2013 8:46 am

How is the governor different? I have had many power plant engine governors apart. see no difference. weights are the same.. Just wondering cause I have heard this before. Been doing cub engines for 40 years. am I missing something?
Collector of Farmall cubs and cub cadets.Injoy helping people keep their cubs running. Years of experipnce.

ScottyD'sdad
Cub Pro
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Posts: 7504
Joined: Thu Aug 31, 2006 7:00 pm
Zip Code: 02769
Tractors Owned: 6"F" cubs
5 lo-boys
1 154
1 184
1 IH444
1 Oliver OC3 crawler
1 AC D10
1 IH 100 manure spreader
1 IH model B corn grinder
3 power units
cub demonstrator
Circle of Safety: Y
Location: Ma. Rehoboth

Re: Power unit

Postby ScottyD'sdad » Mon Jul 22, 2013 9:43 am

Clark Thompson wrote:How is the governor different? I have had many power plant engine governors apart. see no difference. weights are the same.. Just wondering cause I have heard this before. Been doing cub engines for 40 years. am I missing something?

I have heard it. never dissected one, to see if it was true. My power units run, as power units,not in cubs. Ed
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Cecil
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Re: Power unit

Postby Cecil » Mon Jul 22, 2013 9:49 am

The governors are the same except I believe the weights are different to give a higher RPM.

Bob McCarty
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Location: CO, Longmont

Re: Power unit

Postby Bob McCarty » Mon Jul 22, 2013 9:56 am

I think Cecil is right. In looking at the 1954 parts catalog for the Cub, the part # for the weights is 351 778 R1. In the thresher/baler parts manual that has John Puckett's name on it, the part # for the weights is 351 891 R1.

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John *.?-!.* cub owner
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Re: Power unit

Postby John *.?-!.* cub owner » Mon Jul 22, 2013 11:01 am

As has already been posted, the weights in the governor are slightly lighter giving higher rpm. You really have to look close to tell the difference though. The problem with this set up on a tractor is that you have very limited selection in the mid range position of the throttle. It goes from idle to full speed in a shorter move of the lever, which if all you do is mow or ride around, is ok, but doing things like plowing, cultivating, or driving in parades you need those other engine speeds. I put one on the cub I took to the Tug a couple years ago, but when I got home I took it off because I did not like it for regular use. My loader cub has a power unit engine in it and I left it's governor alone since you do not normally use that many different throttle settings to be critical using a loader. Most of the time it is either wide open or idling, very little use in between.
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Clark Thompson
10+ Years
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Posts: 1573
Joined: Sun Feb 02, 2003 11:01 pm
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Tractors Owned: 1975 IH cub,1948 farmall cub,1979 international 3200 skid steer and a 1974 John deere 350B dozer.
Location: Abbeville Alabama

Re: Power unit

Postby Clark Thompson » Mon Jul 22, 2013 11:22 am

I have a governor off a power unit installed on my 1976 mowing cub. I havent noticed any problems selecting RPM range. I can make any cub engine run at any rpm up to 3200 RPM and still be able to slect any rpm .. I have a old junk power unit with the governor still on it. Soon as I have time I will compare the weights..
Collector of Farmall cubs and cub cadets.Injoy helping people keep their cubs running. Years of experipnce.

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John *.?-!.* cub owner
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Re: Power unit

Postby John *.?-!.* cub owner » Mon Jul 22, 2013 11:29 am

I could still select different ranges, but they were in wider steps.
If you are not part of the solution,
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Ray 59
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Re: Power unit

Postby Ray 59 » Mon Jul 22, 2013 8:38 pm

Thanks guys I just bought this for the carb and the head but after I got it home and looked it over a little I think will see if it will run it is mounted on a two wheel trailer with a saw RAy
1948 Farmall Cub 1949 Farmall Cub 2 1950 Fafmall Cubs 1951 Farmall Cub 1957 Farmall Cub1958 230 Farmall 1957 350 Farmall 1986 White FB16

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John *.?-!.* cub owner
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Posts: 23701
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Power unit

Postby John *.?-!.* cub owner » Mon Jul 22, 2013 9:31 pm

The limited experience I have had with them they do not have near as much wear as a typical cub engine, but if you are going to use it much, I suggest putting new rings in. the one I put in a tractor went from good compression to smoking like crazy in only a few hours. When I tore it down the cylinders had hardly any wear, but the rings were worn badly. the bearings had pieces of babbit coming out, so I gauged it and purr standards back in, all has been great since.
If you are not part of the solution,
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