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  #16  
Old 10-26-2018, 05:11 AM
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Quote:
Originally Posted by kirk View Post
So I finally got to this today and I already have to stop and ask a question.

The instructions state "But first, make sure they hold vacuum when not energized. Connect a hose to the center vacuum port (where the black tube was connected) and suck it. It should hold vacuum. If it doesn't, the following fix probably isn't for you."

I have my EATC out and I did a vacuum check on the center port and it leaks.

I thought the whole issue here is that the O rings leak and it won't hold vacuum. Is there some other seat or seal in the solenoid that should hold this or are the instructions backwards?
The EATC o-rings need to be replaced.
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  #17  
Old 10-26-2018, 05:55 AM
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Quote:
Originally Posted by fastblackmerc View Post
The EATC o-rings need to be replaced.
Thanks. That's what I thought and I'm moving in that direction. I was just thrown off by that sentence.
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  #18  
Old 10-26-2018, 06:02 AM
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Lightbulb Mityvac

Quote:
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So I finally got to this today and I already have to stop and ask a question.

Hoping everyone is using a Mityvac or something similar. On my 2nd; haven't used it in years. Wore out my first one diagnosing electro-thermo-vacuum devices from yesteryear.


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Last edited by Invective; 10-27-2018 at 12:15 AM.
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  #19  
Old 10-26-2018, 08:56 AM
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Sounds like the instructions are poorly written. The black tube (vacuum source) goes to a manifold that all the solenoids connect to. If you can hold a vacuum on the black tube, then you do not have a solenoid o-ring leak.
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  #20  
Old 10-26-2018, 10:44 AM
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Sooner or later ALL EATC solenoids WILL leak.

BTW... Of all the EATC's I've repaired I had only 1 that the manifold was cracked.
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Lt. Colonel Ralph Peters

“Be polite, be professional, but have a plan to kill everybody you meet.”
"I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
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  #21  
Old 10-26-2018, 03:15 PM
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Highly recommend FBM work. Just did mine a few weeks ago, O rings and led lights for just 45 bucks and shipping. It looks great, I didn't even know the blower speed adjuster was supposed to light up.
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  #22  
Old 10-26-2018, 04:20 PM
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Well I got them changed with silicone 007 O-rings.....

and it still leaks, though not nearly as bad as it did. No signs of cracks.

The good news is the guy at the supply house said it wasn't worth the paperwork for 4 O-rings and gave them to me for free.

Back to the drawing board.
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Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
https://sites.google.com/a/wmich.edu/supermarauder/
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#168
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  #23  
Old 10-27-2018, 06:37 AM
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Send to FBM......problem SOLVED!!
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  #24  
Old 10-27-2018, 03:57 PM
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Now that I've looked at this in more detail I understand these instructions. I also find them a little misleading and technically incorrect.

Quote:
Originally Posted by kirk View Post
So I finally got to this today and I already have to stop and ask a question.

The instructions state "But first, make sure they hold vacuum when not energized. Connect a hose to the center vacuum port (where the black tube was connected) and suck it. It should hold vacuum. If it doesn't, the following fix probably isn't for you."

I have my EATC out and I did a vacuum check on the center port and it leaks.

I thought the whole issue here is that the O rings leak and it won't hold vacuum. Is there some other seat or seal in the solenoid that should hold this or are the instructions backwards?
The O-rings do not seal the vacuum under no-load situations. They're only required when the solenoid is energized. And I'm sure they were the cause of the problem.

It's the seal on the solenoid plunger that seals while de-energized. I'm not too worried about that leak because it's leaking to the vent, and the plunger will be harder to find than an O-ring.

So it goes back together.
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1963 Marauder S-55, Super Marauder 406
Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
https://sites.google.com/a/wmich.edu/supermarauder/
______________________________ _____________

First retailed 2003 Marauder
Bought 6 June 2002
#168
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