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Vancouver Auto Chat 2016 VAC Community Head Moderator: Raid3n

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Old 11-04-2016, 08:22 PM   #1
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over torque my spark plug....?

So yesterday I replaced my spark plugs in my car (e90 335i)

I borrowed a friend's torque wrench to do the job...
everything went well and car drives fine afterward..

But today when I was looking at the torque wrench...i realize I mis-read the readings on the shaft and it was set around 15N-m higher than I intended....
The spark plugs calls for 23+/- 3 N-m. I thought I set it to 25N-m, but it ends up being more like 40N-m...

Is this..."kinda okay"? or going to be quite bad for the engine/spark plug?

The other thing is..beside using a toqrue wrench, I see some spark plugs manuf. and people suggests using finger tighten + 1/2 - 2/3 turn method.
I recall for pretty much all the spark plug, I only hand tighten it with a screwdriver and did about 1/4 turn before the wrench click. (If i had done 1/2 turn, the force would've been a lot higher...)

Also, when I took off 1 of the new spark plug installed with the 40N-m wrench. (wanted to check something) It came off much much easier than the old ones I took off. Tho the old ones were quite filthy and had some oils and carbon on the thread. I was actually worried the torque were too low.

Since everything seems fine now...should I even bother taking everything out and re-torque all the spark plug?
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Old 11-04-2016, 09:02 PM   #2
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if it's not stripped you are ok.
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Old 11-04-2016, 09:10 PM   #3
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If you're worried about it, how hard is it to crack them loose and torque them?
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Old 11-04-2016, 09:10 PM   #4
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trust me, ive seen gorillas torque much higher than 15nm over spec. many guys don't even use torque wrenches

you are okay
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Old 11-04-2016, 09:36 PM   #5
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Quote:
Originally Posted by fliptuner View Post
If you're worried about it, how hard is it to crack them loose and torque them?
harder than making a post on revscene for sure

I guess I will just leave it.
This is probably the last spark plug change on the car anyway. (160K)
I thought if the over torque did damage the thread or something, but it is holding out fine now, taking it out could just make it worst.
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