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coil and distributor

Posted By Lanny White 5 Years Ago
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Lanny White
Posted 5 Years Ago
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Thanks, Cliff.  Do you know how much end-play there should be between the housing at the collar and the relative distance from the collar to the end of the shaft at the oil pump drive tang?
Cliff
Posted 5 Years Ago
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Oil pump drive rod to long.
Lanny White
Posted 5 Years Ago
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Kevink, thanks for the input.  I did get a spark with the matchbook in place and now will pull the distributor again to check out ground wire and replace the condenser.

However, I discovered in examining the dist. cap that the rotor has been making contact with the lower faces of the wire towers.  I checked the dist. end-play while still installed and found there was none so it seems that the dist. shaft extends a bit too far into the dist. housing causing the rotor to strike the inside of the cap.  Not too sure what to think of this but will maybe know a little more upon removing the distributor.  Any thoughts?
kevink1955
Posted 5 Years Ago
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Gene, Its confusing and almost counter intuitive that "0" is a closed circuit with no resistance,   the mind sees it the other way around Lol 
Gene Purser
Posted 5 Years Ago
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You are correct, I checked my meter and I had remembered/posted in reverse of actual. I apologize.
kevink1955
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Gene Purser (3/15/2020)
A "0" reading across the primary (+/-) terminals would indicate a faulty coil because of a completely open circuit. If the two terminals were connected with a solid wire, you would read a "1" on the ohm meter. A reading of "0" indicates just the opposite, no connection at all.


Not really, A "0" indicates continuity, either a direct short or a resistance so low that the meter cannot resolve it. An open is infinity (infinity symbol is an 8 on it's side) which would be no meter movment at all (same as having the meter leads connected to nothing.
 
With the small lead going to the distributor disconnected and the key on, tap the empty coil terminal to ground, do you get a spark (this proves power and a coil that at least conducts) , if so with the points open (or a matchbook between then) tap the small distributor wire to the empty terminal, do you get a spark. If so you have a ground in the distributor, could be a shorted condenser.

Passed the above tests then rotate the engine till the points are closed, tap the small distributor wire to the empty coil terminal, you should get a spark, if not you may have a bad wire to the points or the points are so fowled that they are not really closing.   1 other thing to check is the ground strap on the breaker plate, is it intact. A missing strap could (not likely) let the plate become insulated from ground.

All the above tests sound like a lot but they are really simple and no meters required

Gene Purser
Posted 5 Years Ago
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A "0" reading across the primary (+/-) terminals would indicate a faulty coil because of a completely open circuit. If the two terminals were connected with a solid wire, you would read a "1" on the ohm meter. A reading of "0" indicates just the opposite, no connection at all.
Lanny White
Posted 5 Years Ago
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Thanks, John.  I just came back into the house after testing again.  I got a reading of zero across the plus and minus terminals and a 7.8 across the center of the coil to either + or -.  However, I am not sure what this tells me.
Hoosier Hurricane
Posted 5 Years Ago
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Lanny, test the ohms with the ignition switch off.  Also, disconnect the small wire to the distributor so you won't get a false reading through the points.

John - "The Hoosier Hurricane"
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Lanny White
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Thanks for the reply, Tedster.  I am way NOT handy with a multi-meter but I think I figured it out.  Is the test conducted with the ignition switch on or off.


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