1948 CUB

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baldwindiesel
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1948 CUB

Postby baldwindiesel » Thu Sep 20, 2018 12:35 pm

I haven't been able to get my 48 CUB to run, I had the magneto rebuilt and I am getting spark (timed correctly) plus fuel but the engine won't fire. Tried hand cranking, and using a battery with no luck. It has sat for over 10 years and I seem to have low compression, what are my options to at least get it running ??? :help: :tractor:

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tmays
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Re: 1948 CUB

Postby tmays » Thu Sep 20, 2018 12:40 pm

When you say it won’t fire, I assume you mean run? Done a compression test? Try pulling it to see if it will run?
Thomas

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Barnyard
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Re: 1948 CUB

Postby Barnyard » Thu Sep 20, 2018 12:41 pm

What are your compression readings? Have you checked for stuck valves?
There are two ways to get enough Cubs. One is to continue to accumulate more and more. The other is to desire less.

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jsfarmall
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Zip Code: 72454
Tractors Owned: 1948 Cub "Trusty"
1948 Cub "Rusty"
1948 Cub "Bob"
1948 Cub "Sallie" (wife's tractor)
1965 IH Cub "Annie"
1943 Farmall H
1953 Farmall Super M (granddad's tractor)

Re: 1948 CUB

Postby jsfarmall » Thu Sep 20, 2018 5:09 pm

Stuck valves are likely. Assuming you have grounded out a plug on the engine to make sure spark is getting yo the plug not just at the distributor.
1948 Cub "Trusty"
1948 Cub "Rusty" mower tractor, trimmed ear dash
1948 Cub "Bob"
1948 Cub "Sallie"
1965 IH Cub "Annie" mower tractor,
1943 Farmall H,
1953 Farmall Super M

baldwindiesel
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Re: 1948 CUB

Postby baldwindiesel » Fri Sep 21, 2018 3:22 pm

Today I have a happy CUB ! I jump started it to my Cub Cadet and I just kept cranking it over and over until I finally got a puff of smoke ! It took quite a few starting cycles but the valves finally freed up and it starts and runs great ! That is; until the fan seized up and burnt the belt up in smoke, but that's a fix for another day.
I would like to note that this tractor had sat in storage for 10 years or more, It had a stuck piston as well which Marvel Mystery Oil helped fix. I had sprayed all the valves with PB Blaster almost a year ago so all it was needed was a warm turning engine. All fluids were also changed prior to today.
This was a free tractor and I will now be able to tell the prior owner that there gift has bore fruit which will make them happy.
Thanks all :{_}: :thanx: :hattip: :tractor:
Baldwindiesel

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Glen
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Re: 1948 CUB

Postby Glen » Fri Sep 21, 2018 4:43 pm

Hi,
Good that you got it to run.

Hopefully you looked at the oil gauge to see if there was oil pressure, you didn't say if you primed the oil pump before running the engine.

If the fan turns again when the engine is cold, lube it like the Cub owner's manual says, and it might work. But hard to say if the fan shaft or bearing got scored.
A pump oil can works for putting oil in the fan. They use engine oil, the Cub owner's manual says. :)

baldwindiesel
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Posts: 224
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Re: 1948 CUB

Postby baldwindiesel » Fri Sep 21, 2018 8:39 pm

I did prime the oil pump and had good pressure. I'm sure there was still Marvel Mystery in the cylinders as well, it shot out plenty of stuff when it finally ran. I'll see if the fan frees up, I didn't expect that to happen !
Baldwindiesel

jsfarmall
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Zip Code: 72454
Tractors Owned: 1948 Cub "Trusty"
1948 Cub "Rusty"
1948 Cub "Bob"
1948 Cub "Sallie" (wife's tractor)
1965 IH Cub "Annie"
1943 Farmall H
1953 Farmall Super M (granddad's tractor)

Re: 1948 CUB

Postby jsfarmall » Sat Sep 22, 2018 6:09 am

You also have to oil the fan. With that being said if you didn't oil it it's highly doubtful just a few minutes if running would lock it up. It was more than likely ready to fail anyway. Probably wouldn't have lasted much longer. Few hours of running maybe.

I believe the replacement fan hubs are sealed and do not take oil. I personally like the old originals. But that's just me.
1948 Cub "Trusty"
1948 Cub "Rusty" mower tractor, trimmed ear dash
1948 Cub "Bob"
1948 Cub "Sallie"
1965 IH Cub "Annie" mower tractor,
1943 Farmall H,
1953 Farmall Super M

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Dale Finch
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Location: NC, Chapel Hill

Re: 1948 CUB

Postby Dale Finch » Sat Sep 22, 2018 7:53 am

PM sent


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