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Dielectric grease for plug wire boots and ends

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Old 10-04-2016, 01:50 PM
  #16  
skpyle
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And, just for clarification, I DO know that dielectric grease and thermal heat transfer paste are two very different things.



Seth K. Pyle
Old 10-04-2016, 02:19 PM
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928S MN
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I think I just found the reason for the engine stumbling while driving in a down pour!! Was driving me nuts trying to chase that one down.

Thanks for that clarification on the ignition module.
Old 10-07-2016, 08:37 PM
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skpyle
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You are quite welcome! Good Luck!

Heed Hacker-Pschorr's warning about removing the modules...


Seth K. Pyle
Old 10-07-2016, 11:33 PM
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Just got new ones from Roger. So if the old ones come apart when removing them, no worries.
Old 10-08-2016, 12:03 AM
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Fogey1
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Originally Posted by dr bob
... If you want to protect ground connections or battery terminals, use Vaseline instead of dielectric grease. Again, only on connections that are already mechanically end electrically secure (clean and tightened). Vaseline has the advantage that it washes out of clothes, plus it's a lot cheaper. ...
I stopped using Vaseline and started using high-temp wheel-bearing grease. Vaseline has a melting point near body temp, so it disappears almost instantly in automotive use, especially under the hood. Good ol' axle grease stays. ;-)
Old 10-08-2016, 12:56 PM
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dr bob
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My gripe with axle and bearing grease is that it stains everything it touches. In most electrical-protection duties like battery terminals, I look for the Vaseline to "melt" and fill in any voids in the connection itself. If the glob on top melts away, no issues -- it's the inside electrical connections that I want to protect. I'm sure you've seen the little felt washers that are intended to go on the posts and under the battery cable. You get to add ATF to those, and the ATF then wicks by capillary action up into the voids the connection. Vaseline does the same thing, with the help of gravity and the heat of charging the battery. It melts and flows through, excess wipes off easily with no annoying stains if you get some on you. With exposed stranded copper wire by the terminal, a little will wick up inside the insulation and do at least a little protecting from corrosive fumes.

That's my thinking on the subject. YMMV of course.
Old 10-08-2016, 02:42 PM
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Fair enough. An excellent rationale. I hadn't thought of wicking action into wiring.
Old 10-15-2017, 12:17 AM
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Note, all further work done to the engine and accessories on the Red Witch will be documented in this thread:

https://rennlist.com/forums/928-foru...l#post14536481
Old 10-15-2017, 04:35 PM
  #24  
Mrspencer
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Originally Posted by Hacker-Pschorr
No....never, except maybe on a boat trailer.

Dielectric grease on electrical connections is a great way to trap moisture and accelerate corrosion.
how is this possible, if the connections are dry, I run a fleet of trucks 50+ vehicles, we put dielectric grease on any connections that are prone to corrode, we also heat shrink connectors with the same grease inside, I also run it on all my plug wires on my 85 s3 5spd. Just asking, I have never heard of that in my 25 YRS of earning a living turning wrenches.and I'm almost 50 now.



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