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Ferra · 11-04-2016, 07:22 PM

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?

11-04-2016, 07:22 PM	#1
Ferra I don't like cheese but I love milk! Join Date: Nov 2002 Location: Van Posts: 1,980 Thanked 895 Times in 243 Posts Failed 105 Times in 49 Posts	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?