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Spark plugs - To grease or not to grease?

stu1873

stu1873

Messages
2,188
Will it do any harm to apply some copper grease/slip onto the threads of the spark plugs of an EP3?
I am thinking not but not 100% sure if it will do any harm.

The last ones I done were a bit tight getting them off and I will be replacing them very soon.

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Would you apply grease to something that requires friction to stay in place?....


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Lewisgame said:
Would you apply grease to something that requires friction to stay in place?....


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Click to expand...

Fair enough.

It's just that i have seen people using it before but wasn't sure. It seems after a bit more looking that NGK advise not to use it as it can lead to over tightening of the plugs leading them to break in some cases so i will not bother.
 
stu1873 said:
Fair enough.

It's just that i have seen people using it before but wasn't sure. It seems after a bit more looking that NGK advise not to use it as it can lead to over tightening of the plugs leading them to break in some cases so i will not bother.
Click to expand...

You’re spot on there. Unless it’s stated to apply grease or oil to the threads (sometimes required on head bolts/studs) then always keep the threads dry and more importantly clean.
 
stu1873 said:
NGK advise not to use it as it can lead to over tightening of the plugs leading them to break in some cases so i will not bother.
Click to expand...

This. Greasing a thread that should be torqued dry means a false torque reading, you're actually tightening it more than the tool indicates. Dry unless stated by the manufacturer.

If concerned about moisture entering the plug tunnel grease the coil boot with some dielectric grease.
 
Here in Australia re-Holden Commodore engines (V6) I witnessed a Mechanic of long standing grease his Threads (his own car). Why I asked? He said 'Alloys a bit soft on these heads'. I've been racing (not Holdens) and never done it or had to do it in 40+ years.
 
NYA said:
Plug go through multiple heat cycles, they should never seize up in the block. If they do, they've been in there far too long.
Click to expand...

Correct. If they seize they were done up too tight. Otherwise there is no reason for them to seize
 
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