Weird distributor problem! Please HELP!

mamist

Recruit
Joined
Apr 17, 2008
Messages
2
Hi. I am new to this forum and have read a lot of posts and wanted to thank everyone in advance for your expert advice!

Here is my problem, I have a 75 Wellcraft Nova with a 75 351 Windsor in it. The engine only has 300 hours. I pulled the boat last summer after taking it out many times with no problems to do some cosmetic work. I put it back in a couple weeks later and it wouldn't start. I decided to pull it and finish my cosmetic work and wait until spring to tackle the mechanical.

What was happening is it was producing no spark. So, I replaced everything, points, cap, rotor, coil, wires, spark plugs, spark plug wires, condenser, even got a brand new battery. Now when I turn the key or have it in the acc position I can stick a screwdriver in the distributor to the sides or the plate and I get a hell of a spark, but the spark isn't traveling up to the rotor for some reason. Its like it is grounding itself out.

I've talked to a few people and they said it could be any of the following:
-The bushings need to be replaced
-The points are too far apart or are getting pulled too far apart.
-The timing is off
-The firing order is off
-Their is a problem with the cam and the rotor isn't starting at the 1st cylinder

They all seem feasible, but what I don't get is why it is grounding itself out? I took the wires off from how they originally were and replaced them exactly one at a time so I know it is wired right. I checked for frays crimps etc and replaced the wire as well. I have a red wire coming from the center of my coil to the points and two brown wires as well. Any help, input, tests, or ideas would be greatly appreciated. Thanks!
 

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,587
Re: Weird distributor problem! Please HELP!

If you have the distributor cap off, you should not be getting any sparking by just putting a screw driver between the plate and the distributor housing.

Did you set your dwell correctly when you replaced your points?
Do you have 12V or something lower if you have a resistor at the positive side of your coil?

I have a red wire coming from the center of my coil to the points and two brown wires as well. Any help, input, tests, or ideas would be greatly appreciated. Thanks!
What does this statement mean? The wire from the coil to the distributor should be going from the negative side of the coil, through the side of the distributor, to the points.
 

mamist

Recruit
Joined
Apr 17, 2008
Messages
2
Re: Weird distributor problem! Please HELP!

What happens, is when I attempt to turn the engine over it doesn't turn over as there is no spark getting to the spark plugs. Then when I remove the cap and the key is still in the acc position if I touch a screw driver to the plate or the walls of the distrib there is a spark. As for the dwell, I followed the instructions provided. I did notice on the old points there was a small square piece that appeared to seperate the points but on the new one there was no such piece.

As for the coil, the old coil said use with external resistor, and the new one says no external resistor required. I have tried it with both the resistor on and off and get the same result.

Finally, you statement about the wire from the coil to the distrib is correct. It passes through the housing and then goes to the points.

Thanks for your help. Any ideas?
 

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,587
Re: Weird distributor problem! Please HELP!

Explain how you set the dwell.

With the key on, what is the voltage at the positive side of the coil?

With the points closed, what is the voltage at the negative side of the coil? This should be 0V.

With the points open, what is the voltage at the negative side of the coil? Should be 12V.

You said you took wires off....which wires did you take off and then replace?
 

Boatin Bob

Lieutenant Commander
Joined
Sep 24, 2001
Messages
1,858
Re: Weird distributor problem! Please HELP!

It almost sounds to me like your points aren't closing to complete the circuit to the coil but when you play around with the screwdriver you are completing it.

When you say the key is in the ACC position do you really mean the "ON" position? If you do have an ACC position it should not be powering the iginition.
 

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,587
Re: Weird distributor problem! Please HELP!

It almost sounds to me like your points aren't closing to complete the circuit to the coil but when you play around with the screwdriver you are completing it.
That's what it kinda sounds like to me too.
 
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