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Cub Has No Spark!

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Brandon Webb
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Cub Has No Spark!

Postby Brandon Webb » Mon Sep 18, 2006 8:48 am

Tried to start my demo yesterday, roughly wired it up. I can short out the points with a screwdriver and it'll spark, It just won't fire the plugs? What next. The points are newer, I sanded them and set them, should be ok. Do I have a bad dist. or coil? or ? Thanks Brandon.
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Clem
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Postby Clem » Mon Sep 18, 2006 9:15 am

sounds like a short in your switch perhaps.
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Postby Eugene » Mon Sep 18, 2006 9:24 am

Hold the distributor end of the spark plug type wire that goes from the coil to the distributor about 1/8 inch from the block. Jump (short across) the points again. You should get spark everytime you jump the points.

No spark from the coil wire - bad coil. Spark from the coil wire - start looking at the rotor, distributor cap, etc..

Eugene
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Brandon Webb
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Tractors Owned: 1957 Farmall Cub High Crop
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Cub 174 Planter with Row Markers
Cub 201 Planter with Row Markers
No. 27 Corn and Pea Attachments
No. 12 Rotary Weeder Attachment
Pittsburg Carry-Lift
Brookfield Buzz Saw
IH McCormick Seed Plate Test Stand
Location: London, Kentucky

Postby Brandon Webb » Mon Sep 18, 2006 9:32 am

Ok, It's got a brand new 12 volt coil, So the juice goes from the switch through the points then to the coil? In what order does this happen? Thanks Brandon.
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Postby beaconlight » Mon Sep 18, 2006 10:30 am

Here is a list of cub wiring diagrams.

http://albums.photo.epson.com/j/AlbumIn ... 065733&f=0

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Postby Bigdog » Mon Sep 18, 2006 11:19 am

Make sure the points are making and breaking as the distributor turns. Take the cap off and the dust cover and watch as you crank the engine over. Make sure the points open and close completely.
Since you get a spark when using a screwdriver, your coil is OK. It is either in the points or the delivery system (rotor and cap)
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

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Brandon Webb
10+ Years
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Posts: 2340
Joined: Tue Sep 20, 2005 4:32 pm
Zip Code: 40741
Tractors Owned: 1957 Farmall Cub High Crop
1969 International 140
1975 International Cub

Cub 174 Planter with Row Markers
Cub 201 Planter with Row Markers
No. 27 Corn and Pea Attachments
No. 12 Rotary Weeder Attachment
Pittsburg Carry-Lift
Brookfield Buzz Saw
IH McCormick Seed Plate Test Stand
Location: London, Kentucky

Postby Brandon Webb » Mon Sep 18, 2006 11:52 am

Must be the cap, and rotary button. I took the cap over cranked it over and they're breaking. I set them at .020, they look good and arc when shorted out. The coil I took off a running tractor so I know it's good, I'm just not getting any fire to the plugs. Thanks Brandon.
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Postby Eugene » Mon Sep 18, 2006 12:07 pm

silverta16 wrote:Ok, It's got a brand new 12 volt coil, So the juice goes from the switch through the points then to the coil? In what order does this happen? Thanks Brandon.


Primary side of the ignition. Current flow is from the battery to the ignition switch. From ignition switch to one terminal on the coil. Through the coil and out the opposite terminal. From the coil to the points. From the points to ground (back to battery when the points close).

Eugene
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Postby Bigdog » Mon Sep 18, 2006 12:12 pm

Check / replace your rotor button and or cap with known good ones. Also, verify your timing. If this thing is firing between the towers on the cap it ain't never gonna work. Make sure the rotor tip is in the right position near the towers when the points open.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

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Postby Boss Hog » Mon Sep 18, 2006 9:57 pm

Check condenser. I had same problem once after a lot of headake put in condencer worked fine
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