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Tech Tip-- for your safety

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Old May 12, 2007 | 04:44 PM
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Default Tech Tip-- for your safety

If you're fixing any wires around the HEI distributor and soldering them (the correct way), and you use a WELLER soldering gun, PLEASE make sure the key is OFF! The magnetic field around that soldering gun will cause the distributor to fire. If the key is on, and you're leaning over the fan/ alternator, if the engine is in the correct position to fire a cylinder, it could start. and leaning or laying on the fan will hurt..


Last edited by TimAT; May 12, 2007 at 04:56 PM.
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Old May 12, 2007 | 05:14 PM
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Is this something you personally experienced, or heard on the net?

The magnetic field around a Weller soldering iron tip is very weak and I cant see how it could possibly couple enough energy into the secondary of the igniton coil to create a spark.

Sounds like an urban legend.
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Old May 12, 2007 | 06:36 PM
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He is probably talking about the ignition trigger/ hall effect switch.
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Old May 12, 2007 | 07:12 PM
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The pick-up sensor is a coil under the distributor about a mm from the magnet.
The soldering iron would have to be pretty close to that pick-up to have any effect.

Is it possible the soldering iron shorted something to ground which triggered the ignition?


The basic tip is good: Turn power off when soldering.
You could do something out that causes the engine to turn over.

Last edited by Kilroy1024; May 12, 2007 at 07:17 PM.
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Old May 12, 2007 | 08:39 PM
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I always disconnect the battery when I'm under the hood. Seems like a sure fire way to assure nothing goofy happens.
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Old May 12, 2007 | 09:33 PM
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This is something that wouldn't have occurred to me in a million years. I too would like to see this demonstrated.
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Old May 12, 2007 | 10:02 PM
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Wel I could see it making a spark, IF the ignition was on. But I gotta spin my engine pretty god for it to start...
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Old May 13, 2007 | 12:20 AM
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NExt time you've got an HEI out on the bench, clamp the body in a vise, and hook it up- 12V and a ground. Then wave the soldering gun- Not an iron over the top of it. It will fire. Saw this happen at the GM training center in KC.
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Old May 13, 2007 | 02:50 AM
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old weller soldering guns (guns--not irons) produce strong magnetic fields. I use to use one to degauss old tv's and monitors.
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Old May 13, 2007 | 11:37 AM
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Originally Posted by rcread
I always disconnect the battery when I'm under the hood. Seems like a sure fire way to assure nothing goofy happens.


Or working inside the dash.
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