So engine is out right now, and while I am waiting on the new long block to come in, I am in the process of cleaning, fixing wires, rewiring for the new 180A DC Power Systems Alt, ect......
I wanted to clean up my ECM so I took the Philips screws out and opened it.
The epoxy potting compound was obviously cracking pretty bad over all the years of being in the hot engine bay.



All those cracks will allow water, and corrosion in to the circuit board.

I have some 3M Gel Epoxy here that is used in sealing up in-ground lighting transformers. But it was pretty obvious that this is what MOPAR used way back when in these ECM's.



It's a two part epoxy, that you squeeze the two parts together to mix, and then clip a corner off to distribute on the ECM.



I used a pice of card stock to help get it to all parts of the surface.
You can also just tilt the module back and forth to get an even coating.
One packet was just right to put a light coat on the module.

Once your done, just let it set-up for a while on a flat surface.



So all the cracks are filled, and hopefully it will last a lil longer now!

 

How did you remove the old apoxy?

 

I didn't.
All I wanted to do is seal the cracks in the old epoxy so water would not intrude into the PCB.

So I gently blew out ALL the dust first.
Then used contact cleaner in a few places, and used an old tooth brush to gently remove more dirt.
After that I put some 90% alcohol into a spray bottle to remove the contact cleaner.
I let it dry over night, then applied the epoxy over the old stuff to fill the cracks, and make it water tight again.

The second layer is not to high to interfere with anything important.

 

Oh okay. It just looked so dull in the first picture and so clear in the second, thats why I asked