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Join Date: Nov 2013
Location: Tacoma, WA
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Nice DIY. I noticed this was not there and I was planning on posting one.
For the record, putting dielectric grease (a small amount) on the porcelain part of the plug is a good practice. Those plugs get very hot while running and cool down a lot when the engine is shut off for any decent amount of time. This causes the rubber COP boots to bake onto the plugs. This is more of an issue with vehicles that have spark plug wires (mainly because people pull on the wire instead of the boot). The grease keeps a coating between the two and almost completely eliminates this issue.
Do not put a lot of it. This is a case where, if a little is good, a lot is not better. If you put too much it just melts when it gets hot and makes a mess.
Also, for the record, anti-seize should NOT be used on the plugs for this vehicle. Both NGK and Denso coats their plug's threads with a coating that does the same thing as anti-seize (prevents galvanic corrosion due to dissimilar metals and electricity). Anti-Seize will also make the plugs seem to go in easier and sometimes they break before they hit OEM recommended torque. If you remove the plugs and intend to re-use them, I would apply anti-seize because the NGK/Denso coating will have worn off. When they are reinstalled they can galvanize and you'll have fun getting them out again. If you do this only use NICKEL-based anti-seize.
ASE Certified Medium and Heavy Duty Truck Mechanic