Laser Efi Ecu potting compond gel.

[buddy stewart]

Does anyone know what I can put back in my efi computer for bedding compound it's a Gel.
I did a repair and I can't find the right stuff to fill it back up with.

[H2Okie]

Most likely it is a 2 part pourable silicone specially made for potting electronic parts . Do an internet search on "silicone potting materials" . The Merc laser ECU's were made by Cummins and the hi performance Merc ECU's were made by Woodward Governor company back in the days they were making them .
I was going to open a laser ecu up to look inside a couple of years ago but decided against it due to all of the force I was applying yet the case would not seem to budge (Yes the screws were out ) .
Are there any tricks you can share to lift off the cover or does it just come down to brute force?

[buddy stewart]

473014This is what I got after some work you have to just pull it apart. It did not work so i didn’t care if I did damage. I have no idea what the goo is. It falls apart easy just time to clean it out. I was lucky it went bad on the hose. Number 5-6 injectors stopped working.

[H2Okie]

Is the material burnt where it appears black or is it just discolored? I am also curious what you repaired on the board 5/6 "Injector driver" ?

[buddy stewart]

The thicker it is the darker it looks. Solder on 5-6 that is one driver just let go. Lucky me I soldered all of them and seems to run fine on the hose. I want to fill it back up before I take it on the lake.

[KIRCHNER]

Your brave.

[A-train-97]

3M ScotchWeld DP270 Clear 60-Minute Electric&Thermal Resistant Epoxy.You can find it on Amazon if need be. Just wondering how you were able to clean the old potting compound off of the board before soldering?

[buddy stewart]

You just pick away at it. It falls apart and crumbles. This stuff is not hard has a rubber like feel to it.

[H2Okie]

Buddy there is another thread I read here on this site where there was a discussion about changing out the original chip in the ECU to another special chip with a custom fuel curve on the HI Performance Mercs . From what they were saying Mercury didn't even Pot the original ECU boards in the beginning until people started monkeying around and upgrading to custom programmed chips . If this is true it might not even be necessary to put the potting material back in ? Sure would make it easy for future troubleshooting and repairs . Maybe somebody here with the knowledge will chime in on this subject.