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Omega General Help / Re: Sparkplug Tightening Torque
« on: 20 September 2010, 18:09:30 »
Spark plug torques have been a problem for me too. In my Haynes manual for a 2.0 litre SOHC it says 25 Nm for "spark plug heatshields". My car though is a 2.0 DOHC and in that section in the manual no torque is given for spark plugs. However, in the information that came with the plugs I installed a year ago (BOSCH Super 4 520 FR 91X) it says 28 Nm. My torque wrench is scaled in kilogramme metres not Newton metres. 28 Nm is 2.855 kg m. The lowest mark on my torque wrench is 3 kg m and that's what I used for the recent second installation of the same plugs. (The crush washers are already crushed)
I noticed that when I removed the plugs they released very easily, as if they had not been as tight as they should have been. I am guessing that after first installation it would be a good idea to go back to them withing say one month and retighten them.
I noticed that when I removed the plugs they released very easily, as if they had not been as tight as they should have been. I am guessing that after first installation it would be a good idea to go back to them withing say one month and retighten them.