Replace resin/potting material in ICM? - JeepForum.com
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post #1 of 16 Old 08-05-2020, 07:27 AM Thread Starter
Horatio
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Replace resin/potting material in ICM?

I've been working on cleaning up the engine bay. Found that my ICM had its potting material melted out of it and all over the inner fender. I removed the ICM and scraped up as much of the "tar" as I could. It appears to be in good condition with no visible corrosion. Has anyone ever replaced the potting material? The engine is running well so I'd like to keep this ICM. The jeep is garaged and not driven in the rain. Do I need to worry about it?

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post #2 of 16 Old 08-05-2020, 07:43 AM
Matt1981CJ7
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The fact that the potting material melted indicates the ICM has overheated, and it's usually a sign that it's on it last leg.

Personally, I'd bite the bullet and use this opportunity to upgrade the ignition system, before it leaves you stranded somewhere. I like the separated components of a CDI system, like MSD, but others prefer the simplicity of an HEI system. Either one will be an improvement over your original Duraspark system and should give you years of reliable service.

Just my 2 pennies and a pocket full of lint,

Matt
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post #3 of 16 Old 08-07-2020, 07:29 AM Thread Starter
Horatio
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Quote:
Originally Posted by Matt1981CJ7 View Post
The fact that the potting material melted indicates the ICM has overheated, and it's usually a sign that it's on it last leg.

Personally, I'd bite the bullet and use this opportunity to upgrade the ignition system, before it leaves you stranded somewhere. I like the separated components of a CDI system, like MSD, but others prefer the simplicity of an HEI system. Either one will be an improvement over your original Duraspark system and should give you years of reliable service.

Just my 2 pennies and a pocket full of lint,

Matt
Matt, That's sound advice. My original intent was to keep it as close to factory as possible. I've been hesitant to pull a bunch of wire in order to install the HEI and was anticipating just replacing the ICM; however, you've got me reconsidering. This thing is certainly not going to be museum quality any time in the near future. If/When I get around to doing a full restoration, I'll likely be replacing the harness anyway, so I might as well have a reliable ignition system in the meantime.
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post #4 of 16 Old 08-07-2020, 07:55 AM
weapon
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If you do want to keep it stock, I think I have a couple of those lying around in the parts trader tub in my attic. I am sure lots of us who have swapped over to hei do.
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post #5 of 16 Old 08-07-2020, 09:06 AM Thread Starter
Horatio
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Quote:
Originally Posted by weapon View Post
If you do want to keep it stock, I think I have a couple of those lying around in the parts trader tub in my attic. I am sure lots of us who have swapped over to hei do.
Great to know. Thank you. Might not be a bad idea to source one now in anticipation of the current one crapping out.
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post #6 of 16 Old 08-07-2020, 11:13 AM
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Ive had two crap out when I was many hours from home of course. Both had melted backs and one even idled fine but popped and stuttered under load/acceleration. At 12 to 20 bucks for new ones, I keep a spare in the center console. It saved an offroad trip once too.
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post #7 of 16 Old 08-07-2020, 10:54 PM
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There is a good "Stealth HEI" thread that puts a $25 HEI module inside the old case. You gut out the board and install the module and link up to the old wires. makes it plug in and out, you can swap for a Duraspark module or another HEI module on the trail.

The HEI module gets hot so needs a heat sink, that case is perfect for the job.

Unfortunately with the design of Duraspark it puts the current through the module when it is not turning over, hence heat builds up.

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post #8 of 16 Old 08-08-2020, 06:01 AM
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I've been working on my steering column this week and turning the key ON to move the wheel an then turning it off right way.
Finally realized I don't have to do that cause I have the wiring harness disconnected.....
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post #9 of 16 Old 08-08-2020, 06:18 AM
braindamage
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Just buy a replacement. I went back to it after messing with MSD and it’s been fine.
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post #10 of 16 Old 08-08-2020, 07:47 AM Thread Starter
Horatio
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I went ahead and pulled the trigger on a new crown ICM. Probably should have asked first, but what are your opinions on replacements vs. originals? Crown vs. OMIX?

Also, I just discovered that the OMIX headquarters is right up the road from me. They have a nice jeep collection that you can tour.
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post #11 of 16 Old 08-08-2020, 08:00 AM Thread Starter
Horatio
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Quote:
Originally Posted by BagusJeep View Post
There is a good "Stealth HEI" thread that puts a $25 HEI module inside the old case. You gut out the board and install the module and link up to the old wires. makes it plug in and out, you can swap for a Duraspark module or another HEI module on the trail.

The HEI module gets hot so needs a heat sink, that case is perfect for the job.

Unfortunately with the design of Duraspark it puts the current through the module when it is not turning over, hence heat builds up.
I did some searching for the stealth HEI and keep running across this non-functional link.

This is a 'Quick Fix' you can do for about $20,
http://www.junkyardgenius.com/ignition/jeep/HEI01.html

Anyone know where I can find the actual link/thread?
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post #12 of 16 Old 08-08-2020, 08:23 AM
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I think both crown and omix are junk...but it’s worked for me for a few years.
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post #13 of 16 Old 08-08-2020, 11:08 AM
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Quote:
Originally Posted by Horatio View Post
http://www.junkyardgenius.com/ignition/jeep/HEI01.html

Anyone know where I can find the actual link/thread?
Use the Wayback Machine. https://archive.org/web/

Copy the dead link, paste into wayback, and pick a date.

Save or copy any pictures or diagrams, sometimes when they are gone, they are gone forever.
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post #14 of 16 Old 08-08-2020, 11:23 AM Thread Starter
Horatio
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Quote:
Originally Posted by CJ7-Tim View Post
Use the Wayback Machine. https://archive.org/web/

Copy the dead link, paste into wayback, and pick a date.

Save or copy any pictures or diagrams, sometimes when they are gone, they are gone forever.
Awesome! That helped. Thanks.

I attached a PDF for future reference.
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File Type: pdf Junk Yard Genius.com 'Stealth HEI Page.pdf (881.8 KB, 12 views)
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post #15 of 16 Old 08-08-2020, 01:13 PM
John Strenk
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This is the one that JYG labeled 'Stealth" HEI

You kinda get the idea.

It was hard to find a DuraSpark module with flats inside.
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