10-16-2017, 09:39 PM | #1 |
Junior Member
Join Date: Oct 2017
Posts: 1
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A no spark
Just purchased a 31 A pick up. Haven't run for 20 yrs. changed oil, new liquid in rad ,New gasoline,new batt.motor turned over but not start. No spark at plugs and at coil..what do I check?
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10-16-2017, 10:36 PM | #2 |
Senior Member
Join Date: Dec 2011
Location: New hope Minnesota
Posts: 742
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Re: A no spark
Check the points gap .022, run a piece of sandpaper between them, 6volts at the movable point when open.
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10-16-2017, 10:39 PM | #3 |
Senior Member
Join Date: Jun 2017
Location: Walla Walla, WA
Posts: 1,045
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Re: A no spark
There are only three components, excluding the connecting wires, that produce spark. The points and the condenser which are located in the distributor body, and the coil. Points could be "frozen" open or shut, condenser could be shorted out, or the coil could be shot. Any of which could happen after being stored for 20 years. The good news is that any or all of these items are not expensive, and the points and condenser should probably be changed out anyway after being stored for that long. There is a member of this forum, Jack Bahm that has a You-tube channel on Model A's. It seems to me that I saw a video by him on how to bench test each of the components. You can probably find a lot of discussion by searching past posts on the forum.
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10-17-2017, 01:06 AM | #4 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: A no spark
I wouldn't change a thing unless it's broken. It might be you only need to clean the oxidation off the points, or it might be stripped teeth on the cam gear from trying to push stuck lifters up.
First hand crank the engine to see if the rotor goes around and to check for compression on each cylinder. If that's good, then stop the engine with the points open, hold the coil wire 1/4" from a head nut, turn the key on and short the points with a screwdriver to see if you get a hot blue spark. If you do, then clean the points contacts and check for spark again. On my 1939 motorbike I had to clean the points a dozen times before I finally had good consistent spark. |
10-17-2017, 02:29 AM | #5 |
Senior Member
Join Date: Mar 2017
Location: southern California
Posts: 725
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Re: A no spark
I installed a NOS Blue Streak point set once that looked great, but I couldn't get a spark from the system. Once I cleaned those very nice looking points, it ran fine.
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10-18-2017, 08:34 PM | #6 |
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Join Date: May 2013
Location: Lancaster County,Pa.
Posts: 7
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Re: A no spark
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Last edited by Welshmtnroadster; 10-18-2017 at 08:51 PM. |
10-18-2017, 08:44 PM | #7 |
Senior Member
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,496
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Re: A no spark
After 20 years in storage, my first thought was corrosion on the points. As has been suggested above, check for that and clean them if you find they don't make contact.
Please let us know how you go.
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