(29-08-15, 03:32 PM)shaggy link Wrote: I have been a mechanic for 30 years & I did say use it lightly & not near the washer as it doesn't compress but it does stop alloy corrosion! I probably change 60 plus plugs a week & in 99.9% of cases I wouldn't use anything on the threads & don't physically check the gap tho I do look at the gap, don't ever presume the gap is correct cos' the plug is new, plenty of boxes of plugs get dropped! If I ever struggle to remove a plug or snap a plug I will clean the thread, blow the crap out, clean it again then run the chaser back in with a very tiny amount of copper grease (& I do mean tiny amount) before inserting a new plug! You shouldn't use it anywhere near hubs, wheel studs etc as it doesn't compress & messes with torque settings. I have lost count of the amount of times people have complained about warped discs & it is caused by copper grease on hub faces! Iridium plugs do give a cleaner spark, will work with a wider gap using less voltage etc & do last longer but they should still be removed, checked & cleaned! as people do fit & forget they have been known to suffer from tracking on the porcelain.
No offence intended Shaggy.
You can add caliper bolts to the list of where to not use copper grease as well. I used a torque wrench and it went through the thread like butter :'(
[size=1em]I spent ages at work one day searching for a washer with the exact thickness of a spark plug gap which i carry about in my wallet.[/size]
[size=1em]Always good to be prepared. [/size] :lol
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