Spark Plug Torque?
#1
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Spark Plug Torque?
For those that have DIY'ed your 40K service, what torque do the spark plugs require?
Doing a search a few threads pop up on the 997 forum saying 30Nm-22ft/lbs ...... which is pretty normal/standard for plugs at least on my past Audi's and VW's.
Any other info available?
Edit:
Information from 991.1 repair manual 2011-2015
Spark plug → Tightening torque: 32 Nm (24 ftlb.)+/-2 Nm (+/-1.5 ftlb.) → Tightening torque: 25 Nm (19 ftlb.)+3 Nm (+2 ftlb.)
Doing a search a few threads pop up on the 997 forum saying 30Nm-22ft/lbs ...... which is pretty normal/standard for plugs at least on my past Audi's and VW's.
Any other info available?
Edit:
Information from 991.1 repair manual 2011-2015
Spark plug → Tightening torque: 32 Nm (24 ftlb.)+/-2 Nm (+/-1.5 ftlb.) → Tightening torque: 25 Nm (19 ftlb.)+3 Nm (+2 ftlb.)
Last edited by CSK 911 C4S; 12-05-2017 at 02:26 PM. Reason: Confirmed Torque Values
#2
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Sorry, my '15 has a couple of years before I will be changing the plugs. Thanks for asking the question and I'm anxious to hear the answer so I'm ready when the time comes...
PS, Does anyone have a tip for getting a credible 991 service manual for us DYIers?
PS, Does anyone have a tip for getting a credible 991 service manual for us DYIers?
#3
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Assuming that it is the same for the 991 as the 981 (and why shouldn't it be?) the torque spec is 32 N-m (24 ft-lbs) for a new plug and 25 N-m (19 ft-lbs) for re-installed plugs.
If you are interested in 991 manuals, head over to planet-9 and do a search. You'll find a guy...
If you are interested in 991 manuals, head over to planet-9 and do a search. You'll find a guy...
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Why are reinstalled plugs lower torque? Why would someone remove a plug, only to reinstall it? Thank you.
#5
#6
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The only reason I've removed a plug and reinstalled it on other cars has been to trouble shoot a misfire condition. Move the plug and coil pack around to see if the misfire follows before throwing new parts at a car.
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#8
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Or because PCNA won't reimburse your tech's dealer for the $3 each plugs despite their direction to pull them...
I'm just reading from the WSM. I figure the different specs have something to do with the crush washer. But, that doesn't make much sense. The threads in the hole don't know if the crush ring's crushed. 32N-m is 32N-m whether or not you crushed something to get there.
I'm just reading from the WSM. I figure the different specs have something to do with the crush washer. But, that doesn't make much sense. The threads in the hole don't know if the crush ring's crushed. 32N-m is 32N-m whether or not you crushed something to get there.
#9
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delete
Last edited by CSK 911 C4S; 12-05-2017 at 02:27 PM.
#10
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Completed a plug change today on my 2013 C4S (40K), Pretty easy stuff, if you are somewhat hesitant, don't be! I suggest starting on passenger side. I wasn't able to use a torque wrench on either rear plug (L/R bank). Took about 2.5 hours including cleaning the inside of both rear wheels while removed. Plug part number is 999 170 151 90, 32NM for torque.
There is a great deal of satisfaction in working on your own car. The Porsche techs have to develop experience somewhere and it was likely on your car! Heck, if someone is gonna learn (on your car) it ought to be you!
There is a great deal of satisfaction in working on your own car. The Porsche techs have to develop experience somewhere and it was likely on your car! Heck, if someone is gonna learn (on your car) it ought to be you!
#11
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Funny, my 991 manual specifies 24ft lbs for the first tightening and 19 ft lbs for the second tightening. Ask him to show you the source of his opinion, I would be willing to bet that he is wrong.
#12
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You are correct.
Found this in the 991.1 manual.
Spark plug → Tightening torque: 32 Nm (24 ftlb.)+/-2 Nm (+/-1.5 ftlb.) → Tightening torque: 25 Nm (19 ftlb.)+3 Nm (+2 ftlb.)
So 30 Nm (22ft/lb) recommendation was erring on the side of "don't screw this up"
I must not have had the manual at the time of doing my 40K.
Found this in the 991.1 manual.
Spark plug → Tightening torque: 32 Nm (24 ftlb.)+/-2 Nm (+/-1.5 ftlb.) → Tightening torque: 25 Nm (19 ftlb.)+3 Nm (+2 ftlb.)
So 30 Nm (22ft/lb) recommendation was erring on the side of "don't screw this up"
I must not have had the manual at the time of doing my 40K.
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#14
Remember those torque specs assume NO lubricant (or anti-seize) on the plug threads! I like anti-seize and used a torque wrench only once. Cracked 2 plugs and then I went back to the method I've used for over 40 years. Namely, tight and then about a 1/4 turn more. Do it a few times and you'll get the feel. Never had a plug loosen up and, of course, never had one stick.
#15
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Remember those torque specs assume NO lubricant (or anti-seize) on the plug threads! I like anti-seize and used a torque wrench only once. Cracked 2 plugs and then I went back to the method I've used for over 40 years. Namely, tight and then about a 1/4 turn more. Do it a few times and you'll get the feel. Never had a plug loosen up and, of course, never had one stick.
Ditch the anti-seize.