8v battery update

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Papacub
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8v battery update

Postby Papacub » Wed Apr 05, 2017 5:20 pm

Well got the points changed and seem to have fire now....but while taking battery leads off I found the painter had hooked it up backwards as a negative ground system....now I'm wondering what other damage was done...Kind of surprised it was running at all...also th voltage regulator was pretty corroded, will a cub run with a bad regulator and just not charge? Polarized the gen before cranking it over but now it seems not to be getting fuel and after cranking, gas is dripping out of a hole in the bottom of the carb below the breather inlet. It looks like a screw or plug may be missing? Help!

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Glen
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Re: 8v battery update

Postby Glen » Wed Apr 05, 2017 6:15 pm

Hi,
I have read on here that hooking up the 6 volt battery backwards usually doesn't damage anything, but the original type voltage regulator is made for positive ground.

Yes, the engine should run with a bad voltage regulator.

The carburetor is made with a small drain on the bottom, by the air cleaner hose, to let out excess gas. It is supposed to be there, don't plug it.
If you were turning the engine trying to start it, and it didn't start, it is common for fuel to run out the hole. Here is a pic of the IH carb from TM Tractor, it is the round place. :)
Attachments
Cub carb 6.jpg
Last edited by Glen on Thu Apr 06, 2017 1:23 am, edited 4 times in total.

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Re: 8v battery update

Postby Bigdog » Wed Apr 05, 2017 6:19 pm

Check for presence of spark while you are cranking. Your voltage regulator affects only the charging system. As long as you have voltage to the coil and the points are opening and the timing is fairly close it should at least fire and try to run.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

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Papacub
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Re: 8v battery update

Postby Papacub » Tue Apr 11, 2017 7:11 am

Thanks Glen, thanks Bigdog. As of now there is spark to the plugs although they are pretty carbonned up. It's getting good fuel flow to the carb but the plugs are dry. I tried filling the carb with cleaner and letting it soak overnight but no change. I also read somewhere the spark should be blue colored but this spark appeared more yellow. It's a 58 loboy with an IH carb but the top has been scratched and painted so no numbers are visible for exact carb model. I was thinking about a carb kit but not sure what to order with no numbers. Any suggestions?
Thanks for all the good advice for this cub rookie!

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Re: 8v battery update

Postby staninlowerAL » Tue Apr 11, 2017 7:20 am

Parts are common to all the IH carbs except the main jet. Unless something is broken or worn out IH carb is usually repaired by cleaning and a new gasket. McDonalds Carb has individual parts. You can remove the drain to check the fuel flow and remove and clean the main jet without removing the carb. This is a frequently covered subject if you do a search you should find several posts. If you separate the carb be very careful to not break the idle tube/jet which is threaded into the top half of the carb. Search this subject also, it was discussed last week.

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Re: 8v battery update

Postby brewzalot » Tue Apr 11, 2017 8:03 am

staninlowerAL wrote:McDonalds Carb has individual parts


Tip of the day- if you Google Mcdonalds Carb skip the first one that comes up...it only gives calorie counts for Big Macs, fries, and shakes- and nothing about carburetors.

Tim

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Glen
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Re: 8v battery update

Postby Glen » Tue Apr 11, 2017 5:21 pm

Hi,
You didn't say what is wrong with the carburetor, if it drips on the ground sitting, it could need a new needle and seat, or the float level could be too high, or it could have dirt in the needle and seat. TM Tractor has parts for it too. Here is the listing for the needle and seat, if it's an IH carb, they are all the same in their listing, they don't need the carb number.
If you take the carb apart, all the passages should be blown out with air. Use your safety glasses when using the air.

http://www.tmtractor.com/new/fl/5183fp.htm

If it doesn't get fuel to run, the main jet on the carb could need cleaning, it is the hex headed, brass colored part on the lower side of the carb, here is a pic below from TM Tractor, showing where it is. It screws out, take it out and use a small wire in it, like in the pic below, then wash it out.
Shut off the fuel before removing the main jet, or if you leave it on, you can check the fuel flow there. Catch the fuel in a clean can.
The gasket on the main jet might not seal again if it is old, TM Tractor has new gaskets.

The spark plugs should be clean, that could make it not start good too, replace them if they can't be cleaned.

The spark should be blue when you check it, if the battery is good, and fully charged, and the points and condenser are good. If it is yellow, it probably has a weak coil, it is common for IH coils to get weak, especially if it's never been replaced. It probably won't start good with a weak spark.
The pic in the owner's manual shows the original style of coil.

http://farmallcub.com/rudi_cub/www.clea ... e%2042.jpg

They changed styles of coils, and nowadays use a regular looking coil for replacement, so does Case IH, the last I asked them. Here is a listing for it at TM Tractor, you would also need a new coil bracket, the new coil is a bigger diameter than the original coil was. :)

http://www.tmtractor.com/new/el/788fp.htm

http://www.tmtractor.com/new/el/693fp.htm
Attachments
Cub carb 3.jpg
Cub jet.jpg

Papacub
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Re: 8v battery update

Postby Papacub » Thu Apr 13, 2017 12:25 pm

Thanks, Stan, ordered a carb kit from McDonalds yesterday. Thanks Glen, it has good fuel flow to the main jet when it's pulled, otherwise gas streams
out the seep hole towards the front of the carb only when cranking it over. Still good fire to the plugs but going to replace them also and cleaned the
main jet, it seemed good. How tough is it to rebuild the carb with a kit? I'm just a weekend mechanic and am a little nervous about tearing the carb
apart! Thanks to all you experts for helping out a rookie!

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Re: 8v battery update

Postby mikes5785 » Thu Apr 13, 2017 4:42 pm

How old is the gas in the Cub??? Old gas can cause a no start condition

Mike

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Glen
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Re: 8v battery update

Postby Glen » Thu Apr 13, 2017 6:45 pm

Hi,
The Cub's IH carburetor is simple to work on, nothing should fall out of it when you open it.
Pull the 2 halves straight apart, do not twist it, or the small idle tube will break off.
If you take the carb apart, all the passages should be blown out with air, like I wrote above.
Use your safety glasses when using the air.
Here is a page from the cub service manual showing how to set the float height, it is important the float be the right height. The IH carb is in the upper pics. You need a measure that has 32nd inch markings. The height is 1 13/32 inch, like it shows in the pic.
To check the height, turn the upper half of the carb upside down, with the needle and seat, and float assembled, and measure from the bottom of the float to the flat surface of the carb. Bend the arm of the float between the float and the pivot to adjust it.
The float drop needs checking too. Bend the little piece that sticks up by the pivot to adjust that.
Don't tighten the screws hard that hold the halves together, the carb top can warp. You should check the top with a straight edge where it seals with the bottom half to see if it is straight, while it is apart.
Check the small screen in the fuel inlet to the carb, and clean it if it is dirty. Here is a pic of it below, from TM Tractor, and a listing for a new screen.
If the ignition has a yellow spark, you should correct that, it should be blue. I wrote about the coil above.
Below are pages from the cub parts manual showing the IH carb. :)

http://www.farmallcub.info/manuals/gss- ... 002-09.jpg

http://www.farmallcub.info/manuals/cub_ ... 012-12.jpg

http://www.farmallcub.info/manuals/cub_ ... 012-13.jpg

http://www.tmtractor.com/new/fl/195fp.htm
Attachments
Cub carb 7.jpg
Cub carb 7.jpg (12.83 KiB) Viewed 114 times


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