Hello Swedespeeders, looking for some advice after recent spark plug change on my 2016 V60CC T5 at 60k miles. I followed FCPeuro's and several other Youtube videos on changing plugs on my 5cyl. I have done this job before on my previous 13' S60 (same engine). 2 main concerns: 1. what can I learn from the old plugs? 2. Proper torque spec and how critical is it? I am very methodical but always question myself after completing a project..."did I do that exactly right?"
To my first question: The plugs came out rather easy but I did find a small amount of oil on the threads. Cyl 1 & 5 seemed to be the most abused, as you can see in the pictures a bit of white charring on the ground electrode and black at the bottom of the threads. Other than that ceramic looked near brand new. Is the small amount of oil on the threads a concern or any relation to the piston ring issue with these engines?
To my second question and greater concern: I followed each step of FCP's P3 tutorial to a T, except for arguably the most important? The torque spec, which they stated 22nm or 16.2 ft/lbs. I ran out and bought a harborfreight light duty torque wrench after reading good things about them. Although we all know their products are cheap and quality control probably not so good. I set the torque to 16 ft/lbs, hand tightened the first plug, put on the wrench and about a quarter turn got the reassuring "click". However cyl 2-5 did not, I believe I got a faulty torque wrench and feared over-tightening so I continued to use the wrench and was fairly cautious to only turn about a 1/4 turn from hand tight. Maybe there was some user error but either way I tried to be aware and cautious of how tight the plugs were going in, all of them between 1/4 and 1/2 turn from hand tight. How big is my margin of error here? Once everything was buttoned down car started right up, no codes, the only thing I noticed was initial higher than normal RPM revs on cold start and a slight whistle from under the head cover. The whistle went away as soon as the engine returned to normal idle around 500 rpm's. I did notice more immediate power in acceleration on the way home which I was lacking before the plug change.
Just looking for some reassurance here or if I should pull and re-torque the plugs properly when I do brakes in the next couple months. Hindsight, should've rented a proper torque wrench from my local autozone. Any input here appreciated and good day to all.
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To my first question: The plugs came out rather easy but I did find a small amount of oil on the threads. Cyl 1 & 5 seemed to be the most abused, as you can see in the pictures a bit of white charring on the ground electrode and black at the bottom of the threads. Other than that ceramic looked near brand new. Is the small amount of oil on the threads a concern or any relation to the piston ring issue with these engines?
To my second question and greater concern: I followed each step of FCP's P3 tutorial to a T, except for arguably the most important? The torque spec, which they stated 22nm or 16.2 ft/lbs. I ran out and bought a harborfreight light duty torque wrench after reading good things about them. Although we all know their products are cheap and quality control probably not so good. I set the torque to 16 ft/lbs, hand tightened the first plug, put on the wrench and about a quarter turn got the reassuring "click". However cyl 2-5 did not, I believe I got a faulty torque wrench and feared over-tightening so I continued to use the wrench and was fairly cautious to only turn about a 1/4 turn from hand tight. Maybe there was some user error but either way I tried to be aware and cautious of how tight the plugs were going in, all of them between 1/4 and 1/2 turn from hand tight. How big is my margin of error here? Once everything was buttoned down car started right up, no codes, the only thing I noticed was initial higher than normal RPM revs on cold start and a slight whistle from under the head cover. The whistle went away as soon as the engine returned to normal idle around 500 rpm's. I did notice more immediate power in acceleration on the way home which I was lacking before the plug change.
Just looking for some reassurance here or if I should pull and re-torque the plugs properly when I do brakes in the next couple months. Hindsight, should've rented a proper torque wrench from my local autozone. Any input here appreciated and good day to all.
