Distributor Cap/Rotor... CRUD! How come? - JeepForum.com

 
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post #1 of 4 Old 07-06-2013, 05:56 PM Thread Starter
Skerr
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1985 CJ7 
 
Join Date: Sep 2008
Location: White Springs
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Distributor Cap/Rotor... CRUD! How come?

This cap and rotor is off my son's 258 ('79 CJ5). It is part of the Team Rush components. Since we're swapping engines in his Jeep, I thought I would rob his *good* parts and put them on my Jeep! I was surprised when I saw what the cap looks like. This was all brand new stuff. It ran for ~6 months, making daily trips to college. No offroading, only street. The engine is being changed due to blowby. Besides the discoloration, there is a lot of black debris, almost like graphite. What was going on, and can I clean it up to install on my 258?

Thanks.




Kerrdog
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post #2 of 4 Old 07-06-2013, 06:10 PM
swatson454
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That's pretty common. The first place I'd look is plug gap. Contrary to all of the marketing hype, you really don't need more than .040. I used to be a .055+ guy but I've changed my evil ways.

You could also look into the plug wires. Anything that makes it more difficult for the spark to jump the plug gap can make it do what it's done under your cap. Should be an easy fix


Shawn

Edit: I probably shouldn't but where's Jeephammer now to defend his beloved Duraspark and all of his HEI "red dust" comments? Ok, my bad. It's just a product of the spark not going where it should. Good wires and the right gap will probably fix you right up. No worries.

Edit 2: You've changed the metal composition with the spark blowing particles out of it. I'd replace the cap and rotor (upgraded, brass posts) and try to nail down what caused it to begin with.


-S

Live in a way that those who know you but don't know God will come to know God because they know you.
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post #3 of 4 Old 07-06-2013, 06:44 PM
LumpyGrits
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That is normal arc tracking.
LG
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post #4 of 4 Old 07-06-2013, 09:51 PM Thread Starter
Skerr
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1985 CJ7 
 
Join Date: Sep 2008
Location: White Springs
Posts: 9,495
Quote:
Originally Posted by swatson454 View Post
That's pretty common. The first place I'd look is plug gap. Contrary to all of the marketing hype, you really don't need more than .040. I used to be a .055+ guy but I've changed my evil ways.

You could also look into the plug wires. Anything that makes it more difficult for the spark to jump the plug gap can make it do what it's done under your cap. Should be an easy fix


Shawn

Edit: I probably shouldn't but where's Jeephammer now to defend his beloved Duraspark and all of his HEI "red dust" comments? Ok, my bad. It's just a product of the spark not going where it should. Good wires and the right gap will probably fix you right up. No worries.

Edit 2: You've changed the metal composition with the spark blowing particles out of it. I'd replace the cap and rotor (upgraded, brass posts) and try to nail down what caused it to begin with.


-S
Thanks, Shawn. The wires were installed at the time of the TR. Everything new. I thought the cap had brass posts, but I'll go back and look at it. Also, the plugs were gapped at .045, per TR recommendations. So that could improve by going back to .040? I thought the broader cap was supposed to eliminate the arcing under the cap?

Quote:
Originally Posted by LumpyGrits View Post
That is normal arc tracking.
LG
Thanks, Lumpy.

Kerrdog
Go Fish! <*////><

But the right word at the right time... "Hey, give me a little hug!" That's the difference between lightning and a harmless lightning bug!
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