where to put dialectric grease

semmyroundel

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Mar 12, 2021
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Hi all, ordered the new coils and CPR8EAGP-9 plugs, just wondering where I should apply the grease?
Is it where the rubber seal of the coils seal onto cylinder head or on actual spark plug top?
Also, should I remove the metal sleeve of the coils before installing? I've read somewhere to take them off, but maybe I've read so much on this topic that I'm gettiing confused, senior moment time...
Thanks all
 

magic

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I have been putting a thin coating on the inside of the rubber spark plug boot where the boot contacts the spark plug insulator and a generous coating on the outside of the boot especially on the sealing area. I would leave the metal sleeves in place. I have not seen any water in the plug wells or corrosion on the plugs since I started using dialectric grease. Remember, dialectric grease does not conduct electricity, so don't coat the top terminal nuts on the plugs.
 
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Sierra1

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. . . . Remember, dialectric grease does not conduct electricity, so don't coat the top terminal nuts on the plugs.
Not disputing that, 'cuz I've been told that for years. . . . and yet, every one of my battery terminals, and "old fashioned" light bulb sockets get a healthy dose of the stuff as they get replaced. Plenty of conductivity, and no corrosion. My '92 Jeep came from the factory with it in all of the lighting sockets. If not dielectric grease, Vaseline. I have not used it on any of my vehicle's plugs. . . . I trust the boots to do their job.
 

semmyroundel

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Not disputing that, 'cuz I've been told that for years. . . . and yet, every one of my battery terminals, and "old fashioned" light bulb sockets get a healthy dose of the stuff as they get replaced. Plenty of conductivity, and no corrosion. My '92 Jeep came from the factory with it in all of the lighting sockets. If not dielectric grease, Vaseline. I have not used it on any of my vehicle's plugs. . . . I trust the boots to do their job.
Thanks guys, I did wonder about that, I say this because I've been told in the past to put Vaseline on battery terminals for that reason-to prevent corrosion.
I have been doing that for years with no problems, in fact I wouldn't want to put a conducting grease on the terminals, it's the very fact that it doesn't conduct that makes it suitable for electric connections.
Now spark plugs, I don't know about
 

Don in Lodi

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You realize all electrical connections are metal on metal and no amount of dielectric grease will inhibit the flow of electrons. It's an anti corrosion grease, anti air, anti arc, not water soluble, use it where corrosion could be an issue. I use a dab on plug boots to facilitate removal however many years later for the next guy. It's a good sealant/lube on rubber parts, it won't swell the rubber like a petroleum product.
 

magic

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You realize all electrical connections are metal on metal and no amount of dielectric grease will inhibit the flow of electrons. It's an anti corrosion grease, anti air, anti arc, not water soluble, use it where corrosion could be an issue. I use a dab on plug boots to facilitate removal however many years later for the next guy. It's a good sealant/lube on rubber parts, it won't swell the rubber like a petroleum product.
I agree, I just don't coat the top of the plug with it. I use the grease to prevent corrosion, make it easy to take apart and to keep water out. On my first plug change, there was water in the plug wells and recall reading about it here on the forum. Since using the grease, I have not seen any water in the plug wells.
 
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