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X3 E83 (2004 - 2010)
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  #1  
Old 11-10-2016, 10:53 AM
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N52 ngk spark plugs

Just received 6 new BMW branded ngk spark plugs from getbmwparts.com.

Three questions.

1. Everything I have read says that the plugs should be gapped correctly from the box however the gaps look quite large to me. Thoughts?

2. The Bentley manual and everywhere else says to torque the plugs to 23+/- 3 NM. However the spark plug box says 30NM +/-3. What to do?

3. Have also read not to use copper grease or anti seize on NGK plugs. Is this correct?
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  #2  
Old 11-10-2016, 10:54 AM
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  #3  
Old 11-10-2016, 11:02 AM
timarnold timarnold is offline
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I would stick to the Bentley torque specs. That's a pretty typical value. I don't have in front of me what the actual gap is supposed to be, but the gap is quite large so I assume it is correct, particularly if they are all similar.
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  #4  
Old 11-10-2016, 03:37 PM
DangermouseX3 DangermouseX3 is offline
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No anti-seize on NGKs

Have you measured the gap? What is it?
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Old 11-10-2016, 08:27 PM
mtbrdad mtbrdad is offline
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Quote:
Originally Posted by Q4 View Post
Just received 6 new BMW branded ngk spark plugs from getbmwparts.com.

Three questions.

1. Everything I have read says that the plugs should be gapped correctly from the box however the gaps look quite large to me. Thoughts?

2. The Bentley manual and everywhere else says to torque the plugs to 23+/- 3 NM. However the spark plug box says 30NM +/-3. What to do?

3. Have also read not to use copper grease or anti seize on NGK plugs. Is this correct?
My experience changing the spark plugs, http://www.bimmerfest.com/forums/sho...d.php?t=818362. If I recall correctly the gap of the new plugs out of the box was .043" and the ones I pulled out were at about .063". I just torqued them without grease.
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  #6  
Old 11-10-2016, 11:56 PM
dukedkt442 dukedkt442 is offline
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N52 ngk spark plugs

If they're iridium/tipped, they can't be gapped with a traditional gapper because the tip gets damaged.

Torque to the head's spec listed in the Bentley. Even so, really feel it; aluminum is SOFT.

Ive never used anti-seize on plugs, but with the electrolysis that occurs from different metals, it probably wouldn't be a bad idea unless the plugs specifically say not to (for grounding purposes). Changing plugs have been known to pull the threads right out of the aluminum heads on Fords quite often.
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  #7  
Old 11-11-2016, 07:39 AM
mtbrdad mtbrdad is offline
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a little lubricant and thread info

Quote:
Originally Posted by Q4 View Post
Just received 6 new BMW branded ngk spark plugs from getbmwparts.com.

Three questions.

1. Everything I have read says that the plugs should be gapped correctly from the box however the gaps look quite large to me. Thoughts?

2. The Bentley manual and everywhere else says to torque the plugs to 23+/- 3 NM. However the spark plug box says 30NM +/-3. What to do?

3. Have also read not to use copper grease or anti seize on NGK plugs. Is this correct?
Don't use any grease or anti seize on a spark plug threads unless the plug or manufacturer repair manual actually call out for it. If the OEM plugs torque value was calculated without lubricant adding anti seize lubricant to a plug would lower it's listed torque value. As an example here's an ASTM data sheet regarding torque values for screws and it has different columns with or without lubricant and how it affects the torque value, https://www.fastenal.com/content/fed...for%20A574.pdf.
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