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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-23-2008, 07:56 AM   #1
ATF
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Torque specs for Coils & Plugs

Morning all,
In preparation for doing my spark plugs today I decided to re-familiarize myself with the torque specs for the spark plugs. It came to my attention that the older E46's coil is actually bolted into place. Does anyone have the torque spec for these? I've also found some conflicting torque specs for the plugs as well.

For safety's sake I'm just going to torque both to 18 ft-lbs. I don't have a Bentley manual, if someone could chime in with the proper torque specs that'd be much appreciated.

TIA,
Nick
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Old 12-23-2008, 08:16 AM   #2
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18-20 Nm for Spark plugs. The older coils which are bolted in place do not require any excessive torque.
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Old 12-23-2008, 02:28 PM   #3
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For the spark plugs, Bentley calls for 25 Nm while TIS shows 30 Nm. So it's 18-22 ft-lbs, not Nm. I use 20 ft-lbs.

For the ignition coil bolts, they're size M6, so use 10 Nm (7.5 ft-lb). The smaller the bolt the lower the torque needed.
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Old 12-23-2008, 05:12 PM   #4
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The spark plug box (OEM NGK) said 20Nm iirc.
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Old 12-23-2008, 06:56 PM   #5
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From www.ngksparkplugs.com:

Quote:
Flat seat type (with gasket), 14 mm thread diameter, aluminum cylinder head:

18.0~21.6 lb-ft.
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Old 12-23-2008, 07:03 PM   #6
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I did mine last week and never used the torque although I have one that goes from 5-80 ftlbs. I just tighten it with hand and a quarter tight. Well I replaced my coil and boots at the same time with bremi.
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