New coil, cap and wires, still no start

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
rstoots
Cub Star
Cub Star
Posts: 99
Joined: Sun Mar 05, 2017 3:18 pm
Zip Code: 22406
Tractors Owned: 1949
1955

New coil, cap and wires, still no start

Postby rstoots » Sat Jun 03, 2017 6:52 pm

As some may know I wired my Cub for coil when I'm running with a magneto. Applied 12v to magneto and melted magneto coil. Replaced coil. cap,, and magneto grounding switch. Still have no spark, removed wire from magneto to make sure it wasn't grounding coil, still no start. Checked coil cap to make sure it was making contact with coil wire plug wires, it was. Checked distributor cap for contact, it was OK.
Anything else I can check

User avatar
Glen
5+ Years
5+ Years
Posts: 2624
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: New coil, cap and wires, still no start

Postby Glen » Sat Jun 03, 2017 8:12 pm

Hi,
I'm not sure if you replaced or filed the points, the 2 surfaces should be flat and shiny.
I take them out and file them flat with a large file, then wipe off all filings with a clean rag, if you are not replacing them. If they are burned much, it's better to replace them.
If the condenser is bad, it won't have spark.

rstoots
Cub Star
Cub Star
Posts: 99
Joined: Sun Mar 05, 2017 3:18 pm
Zip Code: 22406
Tractors Owned: 1949
1955

Re: New coil, cap and wires, still no start

Postby rstoots » Sat Jun 03, 2017 8:26 pm

Is there a way to test condenser?

staninlowerAL
5+ Years
5+ Years
Posts: 3470
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: New coil, cap and wires, still no start

Postby staninlowerAL » Sat Jun 03, 2017 8:38 pm

What is the points gap setting? Should be .013 for magneto. When you turn engine with the hand crank can you hear the click from the magneto as the engine passes TDC? Did you remove the rotor and pinion gears and are they correctly timed per service manual? Are you using 12v to crank the engine's 6v starter? I don't understand what is meant by this statement: "Checked coil cap to make sure it was making contact with coil wire plug wires, it was. Checked distributor cap for contact, it was OK." Magneto needs solid wire plug wire, not composite type. If you remove the wire from the coil cap to the distributor cap at the distributor cap you should be able to test the coil discharge by holding the end of this wire about 1/4 inch from a good bare ground, and see the spark jump the gap as you turn the engine. NO SPARK = defective coil or bad coil wire/no wire contact at coil cap end of the wire.
Last edited by staninlowerAL on Sat Jun 03, 2017 8:43 pm, edited 1 time in total.

User avatar
Glen
5+ Years
5+ Years
Posts: 2624
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: New coil, cap and wires, still no start

Postby Glen » Sat Jun 03, 2017 8:41 pm

Hi,
The guys on here usually say put in another condenser, and see if it works then.

Here is a pic of the gear alignment that Stan wrote about above. The gears are supposed to be greased also.
Attachments
Cub magneto 4.jpg
Cub magneto 4.jpg (25.13 KiB) Viewed 457 times

rstoots
Cub Star
Cub Star
Posts: 99
Joined: Sun Mar 05, 2017 3:18 pm
Zip Code: 22406
Tractors Owned: 1949
1955

Re: New coil, cap and wires, still no start

Postby rstoots » Sat Jun 03, 2017 9:23 pm

Removed 3 screws holding rotor assembly so I could connect wire from coil to point/condenser connection. Did not remove any shafts that would effect timing. I replaced all plug/coil wires with the braided type, are they wrong? I will try the old coil wire tomorrow.

staninlowerAL
5+ Years
5+ Years
Posts: 3470
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: New coil, cap and wires, still no start

Postby staninlowerAL » Sun Jun 04, 2017 5:59 am

Here's some good information on plug wires: viewtopic.php?f=1&t=96213#p757641

rstoots
Cub Star
Cub Star
Posts: 99
Joined: Sun Mar 05, 2017 3:18 pm
Zip Code: 22406
Tractors Owned: 1949
1955

Re: New coil, cap and wires, still no start

Postby rstoots » Sun Jun 04, 2017 11:08 am

Purchased wires from TM and their site says they are copper core so that leaves me to the condenser or points. I'll keep you posted.

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
Posts: 22763
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: New coil, cap and wires, still no start

Postby John *.?-!.* cub owner » Sun Jun 04, 2017 1:57 pm

If I understand correctly you installed an external coil on your magneto. To do this the internal coil needs to have the lead to the points disconnected, and preferably the coil completely removed to prevent it from getting hot and tar running down into magneto. Do not throw away the core in the center of the coil, if you or anyone else ever wants to restore the magneto to operation the core will be needed, and they are very difficult to find.

If you are running a 12 volt system you either need a coil with built in resister, or an external dropping resister. + side of coil to ignition switch (2 wire switch to turn power on and off), and - side of coil going to points at terminal on side of magneto where kill switch used to be connected. Check for fire from lead coming from coil to cap. If getting fire there, check rotor timing and rotor and cap condition.
If you are not part of the solution,
you are part of the problem!!!

rstoots
Cub Star
Cub Star
Posts: 99
Joined: Sun Mar 05, 2017 3:18 pm
Zip Code: 22406
Tractors Owned: 1949
1955

Re: New coil, cap and wires, still no start

Postby rstoots » Sun Jun 04, 2017 3:17 pm

Am not running an external coil.

Waif
Cub Star!!
Cub Star!!
Posts: 477
Joined: Thu Aug 25, 2016 1:29 pm
Zip Code: 49343
Tractors Owned: 48 Farmall Cub "Seen Yore Dobbin"
53 F-Cub W/Loader.
Circle of Safety: Y
Location: Michigan

Re: New coil, cap and wires, still no start

Postby Waif » Sun Jun 04, 2017 5:56 pm

Stock mag coil is a 6 volt. Running 12 through it does not ,to my knowledge , work. Too much juice.Poof.

rstoots
Cub Star
Cub Star
Posts: 99
Joined: Sun Mar 05, 2017 3:18 pm
Zip Code: 22406
Tractors Owned: 1949
1955

Re: New coil, cap and wires, still no start

Postby rstoots » Sun Jun 04, 2017 6:14 pm

Sorry, There was more background in another post but it was getting too large. I did run 12v through the coil and melted it. The OEM coil does not need 6v to operate. That's why you can crank start it without a battery.

User avatar
tmays
5+ Years
5+ Years
Posts: 2555
Joined: Wed May 11, 2011 8:59 pm
Zip Code: 39180
Tractors Owned: 1948 Allis Chalmers G
1947 Cub
1952 Cub

154 Cub LoBoy
Location: Vicksburg, MS

Re: New coil, cap and wires, still no start

Postby tmays » Sun Jun 04, 2017 6:50 pm

Little confused, here. You don't hook the battery up to a mag
Do you know if impulse is operating as it should?
Thomas

User avatar
Rick Spivey
Cub Pro
Cub Pro
Posts: 2098
Joined: Sun Jul 01, 2007 10:07 pm
Zip Code: 29518
Circle of Safety: Y
Location: SC, Cades 29518

Re: New coil, cap and wires, still no start

Postby Rick Spivey » Sun Jun 04, 2017 7:36 pm

Very confusing information here. But it sounds like you put 12V into one of he internal mag coil leads. Mag coils don't work that way, so as you stated in your first post, you fried it. So now there is no way you are gonna get a spark unless that coil is replaced. You can run it with an external coil, but as John stated, you have to remove the mag coil and wire in the external. You can also replace the internal coil and run it as a magneto, but I suggest you get more information on magnetos before attempting that. Or you can remove the entire magneto and replace it with a battery ignition distributor. Maybe I missed something else, but which of those 3 paths forward do you want to pursue, and we can give you more information on it?
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

Waif
Cub Star!!
Cub Star!!
Posts: 477
Joined: Thu Aug 25, 2016 1:29 pm
Zip Code: 49343
Tractors Owned: 48 Farmall Cub "Seen Yore Dobbin"
53 F-Cub W/Loader.
Circle of Safety: Y
Location: Michigan

Re: New coil, cap and wires, still no start

Postby Waif » Sun Jun 04, 2017 7:43 pm

rstoots wrote:Sorry, There was more background in another post but it was getting too large. I did run 12v through the coil and melted it. The OEM coil does not need 6v to operate. That's why you can crank start it without a battery.



Well, last week my tractor would not start. Ignition/ kill switch was not pulled out all they way ..sigh.

Anyway..are you running a 6 volt system on this tractor , or 12 volt? You replaced the 6 volt internal mag coil.

I'm thinking you are hand cranking it to fire it , but a 6 volt coil on a twelve volt system don't seem right.

( I looked for your other thread and got the impression you had a 12 volt alternator.)


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Alan Riley, BullDAWG, Dale Finch and 5 guests