Under-Torqued Spark Plugs
#16
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#17
Lexus Test Driver
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Denso states: Caution Do not apply screw thread lubricant to the spark plug...
![](https://i.ibb.co/jkHxjzG/Denso-no-anti-sieze.jpg)
#18
#19
Lexus Test Driver
#20
#21
Lexus Test Driver
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ONLY some LPG engines might benefit by thread lubricate, therefore Denso has already applied lubricate to some plugs for LPG engines.
It really should be quite simple to understand...
#22
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Sorry that you aren't able to digest what Denso states for all their spark plugs with the exception of plugs for some LPG engines - Caution Do not apply screw thread lubricant to the spark plug...
ONLY some LPG engines might benefit by thread lubricate, therefore Denso has already applied lubricate to some plugs for LPG engines.
It really should be quite simple to understand...
ONLY some LPG engines might benefit by thread lubricate, therefore Denso has already applied lubricate to some plugs for LPG engines.
It really should be quite simple to understand...
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JGB93 (06-24-24)
#23
Lexus Test Driver
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Caution Do not apply screw thread lubricant to the spark plug...
Can't you grasp the elementary understanding of what Denso is stating; that if A is done that B may happen? Therefore A trumps B.
Let me try to make it very simple to understand. If screw thread lubricant is applied to the spark plug it may make you over tighten the spark plug. So, the most important part of this messaging comes first (A) so that B is avoided. A= DO NOT APPLY SCREW THREAD LUBRICANT.
Even if Denso had reversed the sentence structure and instead stated the message as follows; To avoid over tightening the spark plug do not apply screw thread lubricant to the spark plug - it is the 'do not apply screw thread lubricant to the spark plug' that is the most important part of the message statement.
You certainly do not have to follow Denso's cautionary recommendation - not to apply screw thread lubricant to the spark plug, but that is indeed Denso's recommendation to help guard against the possibility that applying thread lubricant may make you over tighten the spark plug.
Likewise, you certainly do not have to take my understanding of Denso's recommendation statement either. You're welcome to think whatever makes you happy.
![](https://i.ibb.co/jkHxjzG/Denso-no-anti-sieze.jpg)
Last edited by bclexus; 05-01-23 at 11:25 AM. Reason: orthography
#25
Intermediate
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BC loves a fight that's for sure. Hopefully it's all in fun - good to have a strong opinion.
I'm thinking of doing mine but never done plugs before. Seems like a lot of people are concerned about cross threading their plugs. I can see how that might happen because your feel is different using an extension.
Anyone tried the rubber tubing method I've heard of to prevent cross threading? Apparently you slip a piece of semi flexible tubing over the plug to give you more finesse when you're starting to screw in the new plug.
I'm thinking of doing mine but never done plugs before. Seems like a lot of people are concerned about cross threading their plugs. I can see how that might happen because your feel is different using an extension.
Anyone tried the rubber tubing method I've heard of to prevent cross threading? Apparently you slip a piece of semi flexible tubing over the plug to give you more finesse when you're starting to screw in the new plug.
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jgscott (05-01-23)
#26
Lexus Champion
iTrader: (1)
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BC loves a fight that's for sure. Hopefully it's all in fun - good to have a strong opinion.
I'm thinking of doing mine but never done plugs before. Seems like a lot of people are concerned about cross threading their plugs. I can see how that might happen because your feel is different using an extension.
Anyone tried the rubber tubing method I've heard of to prevent cross threading? Apparently you slip a piece of semi flexible tubing over the plug to give you more finesse when you're starting to screw in the new plug.
I'm thinking of doing mine but never done plugs before. Seems like a lot of people are concerned about cross threading their plugs. I can see how that might happen because your feel is different using an extension.
Anyone tried the rubber tubing method I've heard of to prevent cross threading? Apparently you slip a piece of semi flexible tubing over the plug to give you more finesse when you're starting to screw in the new plug.
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
I have a consistent low Tq method for starting threading on things like this for feel. I use my thumb and picky finger only to turn start on the extension until I'm sure it's threaded correctly, then tigthen, after truning in and backing out cleanly.
#27
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b/c can be a lot of help but a few of us can still catch him when he's Wrong. ![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
I have a consistent low Tq method for starting threading on things like this for feel. I use my thumb and picky finger only to turn start on the extension until I'm sure it's threaded correctly, then tigthen, after truning in and backing out cleanly.
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
I have a consistent low Tq method for starting threading on things like this for feel. I use my thumb and picky finger only to turn start on the extension until I'm sure it's threaded correctly, then tigthen, after truning in and backing out cleanly.
I just did a set of plugs on a 2015 Odyssey. No torque wrench for the rear bank! I have a shorty Snap On 3/8 flex head ratchet. It is a 1/4" ratchet converted to a 3/8".
Last edited by JeffKeryk; 05-01-23 at 03:38 PM.
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MikeFig82 (05-01-23)
#29
Lexus Test Driver
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Correct, Do not apply screw thread lubricant to spark plugs for the Lexus GS 350.
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jkeller (05-01-23)