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Correct Torque Spec for Spark Plugs

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11K views 8 replies 6 participants last post by  Them Witches  
#1 ·
Hey guys,

I know this topic has been mentioned quite a number of times, but I haven't been able to find a clear answer and I didn't want to revive dead threads so I figured I'd ask again in a fresh post.

What is the correct torque spec for the spark plugs of the RSX? Specifically, the RSX type-S (2002, k20a2 motor), if it matters. Not sure if the k20a3 sparkplugs have different torque specs.

I will be installing the NGK IFR7G11KS (NGK 7746 Laser Iridium).

I've read this post from the DIY sub-forum, which states to torque the spark plugs to 17 ft lbs.

Other sources I've read online lists torque specs from a range of 13 - 20 ft lbs.

The shop manual initially states the specified torque to be 18 ft lbs for the listed spark plugs, then proceeds to give an exception for the exact same spark plugs listed earlier to 13 ft lbs.... I don't want to over tighten and strip/cause problems with the aluminum head... or have it loose and create other problems... Can anyone confirm the correct torque spec?
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Also, the shop manual recommends some anti-seize on the plug threads,whereas I think NGK does not recommend putting anti-seize. Which recommendation should I follow?
 
#2 ·
The manual has several typos, this being one of them. The lower torque rating is for the A3. I have always and will continue to use anti-seize on the spark plugs. The theory is that the lubricant will increase the chances of stripping or stretching the threads in the head. I don’t know anyone that’s ever actually done so, but I do know people who have broken their spark plugs in the head because they were seized. All you need is a little dab at the beginning of the threads and a good torque wrench. If you don't have a torque wrench, thread them by hand and give them a quarter turn. That's roughly where you should be at.

As for bumping old threads, it's preferred that you do that over starting a new thread for the same exact topic.
 
#7 ·
Not sure if was joking or not being the 😂 face at the end of the red loctite part of comment but with anti seize you generally want to go on the lower side of using a torque wrench because it lubes threads slightly giving you sort of a false reading or you’re actually torquing the bolt more than the torque wrench shows. Same when using loctite. (Of course never use loctite on spark plug threads) Anyway ya never know, a newbie may read something and follow so figure id add just in case.
 
#9 ·
I suppose "to each their own"... However, Threaded parts exposed to higher operating temperatures not TQ'd to spec runs the risk of backing out or getting stuck. The heat cycles of the engine does interesting things to threaded parts. Aluminum is soft and the threads are easily damaged is another reason to consider following the service manual.

Again no disrespect to any one on this thread.