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EFV-8 Club Forum / General Ford Discussion / 1940 Pickup won't start

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Discussion Topic: 1940 Pickup won't start -- page: 1 2

TomO

05-16-2017 @ 9:24 PM

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Craig, both sets are closed for 36 degrees. One set closes and then the other set closes. Both sets remain closed for about 36 degrees of the rotation and then the set that closed first opens and then a few degrees later the other set opens.

Tom

gcraigstep

05-16-2017 @ 4:12 PM

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OK maybe I'm missing something here but Tom you said.

" With the points closed, the reading should be 0 ohms. With the points open the reading should be infinity or "OL" on a digital meter."

"Points" as in both.

If I need to take the reading when BOTH points are open or closed and everyone agrees that the points are off-set.....ones open while the other one closed....how is this done?

sarahcecelia

05-16-2017 @ 3:44 PM

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Those old coils from Ford were filled with TAR! Over the years it degrades and they short out! Even if you find the problem and it's not the coil, I still highly recommend getting rid of yours, if it is an orignial from Henry, and getting a new one from skip Haney to prevent a problem in the future!His are filled with -EPOXY!!

Regards, Steve Lee

sarahcecelia

05-16-2017 @ 3:39 PM

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Uh, these distributors have tw0, that's TWO, sets of points; if one set happens to be OPEN, the other set is CLOSED!The reason for two sets is to get better coil saturation( increased dwell) which equals -You got it- Hotter spark!!

Regards, Steve Lee

TomO

05-16-2017 @ 3:07 PM

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Craig, one set of points makes the circuit for current flow in the coil, the other set opens the circuit to allow the spark to go to the plugs.

I don't know how I could make the instructions more clear without a hands on show.

Tom

ken ct.

05-16-2017 @ 1:16 PM

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No their off set that gives you your dwell. ken ct.

gcraigstep

05-16-2017 @ 12:53 PM

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Testing just the Distributor will be from this copper contact to ground? Are both points "open" at the same time and "closed" at the same time? It seems like they would be offset to each other. When one is open the other is closed and vice versa. Is that correct?

gcraigstep

05-16-2017 @ 8:59 AM

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TomO

I think I'm getting more confused as we go. Tap the starter. Is that with ignition on or off? I did the condenser test with the ignition switch off. The initial reading was around 5 ohms. I then tapped the starter and the reading was around 18k ohms. Is this considered "constant continuity"? Does that sound like a good reading for the condenser?

Now to the Coil test. Is this done with ignition off and no "bumping" of the starter? And is it possible for both points to be open or closed at the same time to get the reading. Aren't one set of points for one side and the other set of points for the other side and they are sequenced to be opposite.....one open,,,,one closed.

TomO

05-16-2017 @ 6:15 AM

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Craig,
Great photos.

I am sorry that my instructions were not more explicit. These tests are made with the engine not moving, one with the points closed and the other with the points open. The tests are trying to isolate the problem to either the distributor or the coil - condenser.

"If you have the stock coil, connect you meter between the condenser contact on the coil and ground. Use the Ohm meter function and turn the engine over with the ignition off." should have been : tap the starter to see if the reading change when the points open.

"If the meter shows constant continuity, remove the coil (the upper passenger side bolt of the distributor must be removed in order to remove the coil) and repeat the test by putting your probe on the large copper contact where the coil supplies voltage to the points." Insert: make sure that the points are open for this test.

Your reading of about 18K when cranking the engine is probably the point dwell.

You need to repeat the test of measuring from the copper contact to ground. With the points closed, the reading should be 0 ohms. With the points open the reading should be infinity or "OL" on a digital meter. If you get any other reading from these tests, you can try cleaning the points with a piece of cardboard soaked in alcohol.

You should also check the condenser. Connect your meter between the center contact and the grounding tab on the ohms setting. The digital meter should read open, reverse the leads and repeat the test. If you get any other reading, replace the condenser.

Let me know how things turn out.

Tom

gcraigstep

05-15-2017 @ 3:47 PM

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TomO

Here's a good pic of the points on the passenger side of the distributor. You can see the gap. Everything looks fresh.

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