The Ford Barn

daveymc29 · 06-25-2022, 03:59 PM

So the Ace Mechanic is off to help a friend fix a guys car. It has Model A works in the distributor with modern plate, points and condensor. We cranked it over with the cap off and observe the points opening normally and everything appears good to go. It isn't. I pulled the coil lead and there is little or no spark when I hold the lead near a head bolt. Spark is blue, but will only jump about 1/8 inch when cranking it over with the starter.
Opened the distributor and break the points with a screw driver and get a weak spark every once in a while. On my car if I do the same I get a spark that will jump 1/4 inch with each breaking of the points and I hear a loud "snap" with each spark..
Measured the voltage at the points and it is close to 6V, but on the low side, not over 6V. I am working with an electrical engineer who tells me that is enough, which I still question, and feel something still is being missed in our diagnisis. Try to use my distributor, but when we pull his we find it has a long shaft, I have two shafts so we try to remove his long shaft and replace my short one with his long shaft. Can't get his off. I went home to get the lower shaft for the two-piece distributor drive and find I don't have any in my spare pile, so we quit for the day. I really think a stronger battery may solve the problem, but since we can see a spark at the coil lead, that tell them there is plenty of juice. What are we missing? (I claim no expertice with electrical things. Just yesterday I tried to start my coupe with stocking feet and got a real jolt into my foot. A totally different problem.)

old ugly · 06-25-2022, 05:02 PM

those modern points sometimes melt the plastic follower/rubbing block, if that happens check that the points aren't shorting against anything in the distributor.
6 volts is lot of power to create spark.
try your coil on his car.
maybe the condenser, you can try yours in his car as well.

Patrick L. · 06-25-2022, 05:44 PM

What is the voltage at the points arm with them closed ?

w.michael · 06-25-2022, 06:29 PM

You can probably reach down in the distributor hole on your engine with needle nosed pliers and pick the lower shaft out of your engine. Sometimes it’s stuck too tight to pick out, but most of the time you can get it. And if you haven’t already, sand or file the points very lightly.

W. Michael

daveymc29 · 06-25-2022, 09:05 PM

New points, will try a different coil before tearing into more engines.

Thanks
Dave Mc Arthur

rotorwrench · 06-25-2022, 10:03 PM

Sponsored Links (Register now to hide all advertisements)

A person should always keep a spare A&L condenser or two. A person can test them with a capacitor tester or do the R&R with a new one to test.

06-25-2022, 03:59 PM	#1
daveymc29 Senior Member Join Date: Sep 2010 Location: Danville, CA Posts: 1,553	Long shaft distributor So the Ace Mechanic is off to help a friend fix a guys car. It has Model A works in the distributor with modern plate, points and condensor. We cranked it over with the cap off and observe the points opening normally and everything appears good to go. It isn't. I pulled the coil lead and there is little or no spark when I hold the lead near a head bolt. Spark is blue, but will only jump about 1/8 inch when cranking it over with the starter. Opened the distributor and break the points with a screw driver and get a weak spark every once in a while. On my car if I do the same I get a spark that will jump 1/4 inch with each breaking of the points and I hear a loud "snap" with each spark.. Measured the voltage at the points and it is close to 6V, but on the low side, not over 6V. I am working with an electrical engineer who tells me that is enough, which I still question, and feel something still is being missed in our diagnisis. Try to use my distributor, but when we pull his we find it has a long shaft, I have two shafts so we try to remove his long shaft and replace my short one with his long shaft. Can't get his off. I went home to get the lower shaft for the two-piece distributor drive and find I don't have any in my spare pile, so we quit for the day. I really think a stronger battery may solve the problem, but since we can see a spark at the coil lead, that tell them there is plenty of juice. What are we missing? (I claim no expertice with electrical things. Just yesterday I tried to start my coupe with stocking feet and got a real jolt into my foot. A totally different problem.)

06-25-2022, 05:02 PM	#2
old ugly Senior Member Join Date: Aug 2021 Location: alberta canada Posts: 585	Re: Long shaft distributor those modern points sometimes melt the plastic follower/rubbing block, if that happens check that the points aren't shorting against anything in the distributor. 6 volts is lot of power to create spark. try your coil on his car. maybe the condenser, you can try yours in his car as well. __________________ old ugly my old father-in-law told me. "listen close when people tell you how to do stuff they may know something. then do it the way you want."

06-25-2022, 05:44 PM	#3
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Long shaft distributor What is the voltage at the points arm with them closed ?

06-25-2022, 06:29 PM	#4
w.michael Senior Member Join Date: May 2010 Location: North Carolina Posts: 418	Re: Long shaft distributor You can probably reach down in the distributor hole on your engine with needle nosed pliers and pick the lower shaft out of your engine. Sometimes it’s stuck too tight to pick out, but most of the time you can get it. And if you haven’t already, sand or file the points very lightly. W. Michael

06-25-2022, 09:05 PM	#5
daveymc29 Senior Member Join Date: Sep 2010 Location: Danville, CA Posts: 1,553	Re: Long shaft distributor New points, will try a different coil before tearing into more engines. Thanks Dave Mc Arthur

06-25-2022, 10:03 PM	#6
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,425	Re: Long shaft distributor Sponsored Links (Register now to hide all advertisements) A person should always keep a spare A&L condenser or two. A person can test them with a capacitor tester or do the R&R with a new one to test.