Dilectric Grease

I recall some of you taking about grease that is put inside the spark plug connectors and around the plug wire connectors on the distributor cap. The grease apparently seals out moisture and eases removal of the plug wire.

Any suggestions as to the brand/type of grease to use for this function. I have a Pep Boys, Napa, and Wal-Mart near by; any chance they would carry this type of grease.

Thanks, Bruce
'84 911
'77 911S (Euro)

I suspect what they're talking about is Dow-Corning DC-4 electrical insulating paste, which is a kind of silicone "grease." I don't know if there's any other kind, but the DC-4 is the gold standard as far as I know. Probably wouldn't find it at a Pep Boys but would at a good electronics shop or an aircraft-parts supplier, which is where I get mine. Although I've never used it on Porsche spark plugs.

Stephan

Bruce,

There may be more sophisticated silicone lubricants such as Dow Corning, but I use regular over the counter dilectric grease on mine. This stuff looks kind of like vaseline. A thin coat will help on any electrical contact to keep corrosion from interfering with contact.

Good Luck.
Nick.

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Nick Shumaker
1982 911SC Coupe
nickshu@yahoo.com

Dow Corning 4 was the 'orininal' silicone grease in the 1940s, and the first application was protecting ignition systems on military aircraft. There was a version called 4X marketed specifically for the automotive market in the '70s, intended for both dielectric applications and lubricating rubber products and seals, such as brake cylinder seals and cups. The physical appearance of DC 4, DC 111, and DC 112 is identical, though 112 has a heavier consistency, and stays in place better at high temperatures. DC 4 is marketed for dielectric applications.DC 111 and DC 112 are both intended for valve packing lubricants and O-rings. DC 4 and DC 111 share the same data sheet and specifications,
along with DC 7, a mold release compound.

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Warren Hall
1973 911S Targa

Thanks your help guys (as usual).

Bruce

Recently called on a customer who makes magnets for Cyclotron beam lines. At his plant, I spied a large tube of Corning DC 112. Asked the owner if he could get me a tube at a discount. He *gave* me 2 tubes, free! I now have enough for about a thousand years of ignition water proofing.


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Doug
'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
members.home.net/zielke/911SC.htm