Spark Plug Anti Sieze

·         Gerry

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This is taken from NGK web site:

NGK spark plugs feature what is known as trivalent plating. This silver-or-chrome colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal. NGK spark plugs are installed at the factory dry, without the use of anti-seize. NGK tech support has received a number of tech calls from installers who have over-tightened spark plugs because of the use of anti-seize. Anti-seize compound can act as a lubricant altering torque values up to 20 percent, increasing the risk of spark plug thread breakage.

The Jabiru Engine maint manual calls for use of anti-sieze, I,ve been following Jabiru instructions, but wondering about the descrepancy?

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·         Doug Smith

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Hi Gerry,
The torque figures we give for the spark plugs include allowance for the anti-seize... And in our application - horizontally opposed, air cooled, mostly using leaded fuel - we tend to get more deposits in the combustion chamber that can clag up the spark plug threads. So the anti-seize is as much there to fill the gaps and stop the deposits from getting in there as it is an actual lubricant.
Cheers!
Doug.

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·         Gerry

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Thanks Doug, that explains it. I appreciate your quick reply.