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WD timing

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Author 
JIM-IL

04-12-2003 06:21:10




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Hi Duey
I worked on the old girl yesterday to no avail. I put in the new switch to give power to the coil, and I cranked til it blew my thumb off #1, lined up the fire mark on the flywheel, opened the points saw a spark, lined up the rotor with #1, and no start when I cranked. I called the local parts store to see if they could test the coil but they couldn't. If it sparked does that mean it's O. K., or could it still be bad? I'm at a loss as how to proceed from here.

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Duey (IA)

04-13-2003 21:52:07




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 Re: WD timing in reply to JIM-IL, 04-12-2003 06:21:10  
Jim,
Dave got it right. The low voltage current goes through the coil and then to ground when the points close. This surge of current aided by the condensor causes the HIGH voltage from the coil to the plugs. Static (not running)timing just gets everything lined up so the spark is produced and can travel from the coil to the correct plug at the correct time. The spark at the points says the low voltage circuit is working. If the coil is putting out a good HIGH voltage spark, then then the only thing is to get it to the right plug at the right time. When #1 piston is at Top Dead Center, the rotor has to be pointing to a tower on the dist cap that has #1 plug wire in. In this position the dist clamp bolt can be loosened and with the switch on turn the dist to open the points and then close the points. When you see the spark between the contacts, tighten the clamp bolt. Then clockwise install the rest of the plug wires 2 4 3. The ignition should now be static timed. As Dave said lay a plug on metal and you should get spark If no spark it has to be one of the following; coil, condensor, rotor, cap, wire, or plug. If you replace the coil get one with a internal ballast resister. Duey

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Dave K

04-12-2003 07:39:55




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 Re: WD timing in reply to JIM-IL, 04-12-2003 06:21:10  
You can have a spark at the points but if the coil is bad you won't have the spark at the plugs. The voltage at the points is simply the battery voltage where as the coil steps it up to spark the plugs. You get 6 or 12 volts on the points (depending on which electrical system you have) and 20,000 or so volts at the plugs. You can try taking out a plug, lay it where you can see the electrodes, make certain the metal case of the plug has a good ground, crank the engine and watch for a spark to jump the gap, should be a blue-white spark, if yellow it's not hot enough. You can also do this by simply removing a wire from a plug and as you crank hold the plug end of the wire close to the block or any ground. Again a blue/white spark should jump to the metal from the wire. DO NOT touch the plug end of the wire with your hand or you will be the one to jump!! Another method is to take a known good coil from an old car or whatever and put it in place of yours and see if it starts.

Dave

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