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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 11-08-2004, 06:54 PM   #1 (permalink)
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Am replacing the spark plugs in my 1999 540i with the original-type NGKs listed in my owner's manual. Torque on spark plugs in aluminum heads is always important, but I cannot find that figure anywhere in my owner's manual. Does BMW think ALL of its owners would be helplessly dealer-dependent?!? used Even my Honda's owners manuals specified spark plug torque!

Anyone know the required torque for spark plugs in a 1999 540i? Please help, thanks!
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Old 11-08-2004, 08:03 PM   #2 (permalink)
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Quote:
Originally posted by Eric S.@Nov 8 2004, 08:54 PM
Am replacing the spark plugs in my 1999 540i with the original-type NGKs listed in my owner's manual. Torque on spark plugs in aluminum heads is always important, but I cannot find that figure anywhere in my owner's manual. Does BMW think ALL of its owners would be helplessly dealer-dependent?!? used Even my Honda's owners manuals specified spark plug torque!

Anyone know the required torque for spark plugs in a 1999 540i? Please help, thanks!
[snapback]227027[/snapback]
Eric,

Not too sure on this... I checked around the forums and came up with 18 ft/lbs for a M3. This quote is from a rather experienced user on another forum --

"Sparkplugs are not stretch-to-yield fasteners. They can be removed and reinstalled at will. the torque spec is merely to ensure a good seal in the cylinder head. 18lbs/ft will be fine with or without antisieze paste on the threads. The car won't know the difference."
-Paul


Like I said...not too sure. Check around. Any help here Members?

Jim
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Old 11-08-2004, 09:26 PM   #3 (permalink)
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Eric s: This table should cover it all

Spark plug Correct Torque
10mm with Gasket…..8-11
12mm with gasket…..12-15
14mm with gasket…..19-22
18mm with Gasket…..20-23
18 mm tapered………..14-17

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Old 11-08-2004, 10:19 PM   #4 (permalink)
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Originally posted by billB@Nov 8 2004, 11:26 PM
Eric s: This table should cover it all

Spark plug Correct Torque
10mm with Gasket…..8-11
12mm with gasket…..12-15
14mm with gasket…..19-22
18mm with Gasket…..20-23
18 mm tapered………..14-17

regards
Billb
[snapback]227113[/snapback]
Where do you come up with this stuff -- Genius!

Good Night.
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Old 11-09-2004, 10:36 AM   #5 (permalink)
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I have my own data base and sometimes I HIT many times I MISS. I don't feel so bad about missing beacause our whole life is a learning process!!!
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Old 11-09-2004, 10:48 AM   #6 (permalink)
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Old 11-09-2004, 12:43 PM   #7 (permalink)
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Quote:
Originally posted by billB@Nov 8 2004, 11:26 PM
Eric s: This table should cover it all

Spark plug Correct Torque
10mm with Gasket…..8-11
12mm with gasket…..12-15
14mm with gasket…..19-22
18mm with Gasket…..20-23
18 mm tapered………..14-17

regards
Billb
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Bill - Thanks, I think that table is helpful, provided I can now come up with the diameter for the threads of my spark plugs. Putting 2 and 2 together, I've seen a number of 18 ft-lbs (which I thought was too low), so I guess my spark plugs' threads are 14mm and so my spec would be 19-22.

So now how much do I torque those two coil nuts (per coil) when I reinstall them? Anyone, anyone?
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Old 11-09-2004, 02:49 PM   #8 (permalink)
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I'm a british BMW tech so you'll have to convert from Nm (newton meters) lbs ft
Most sprak plugs are 14mm thread and are 30Nm+/- 2 M power engine are 12mm thread and are 25Nm =/- 1 The 6mm thread (10mm across flats) nuts or bolts for the coils 10Nm Hope this helps
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Old 11-09-2004, 06:42 PM   #9 (permalink)
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Quote:
Originally posted by bad man working@Nov 9 2004, 04:49 PM
I'm a british BMW tech so you'll have to convert from Nm (newton meters) lbs ft
Most sprak plugs are 14mm thread and are 30Nm+/- 2 M power engine are 12mm thread and are 25Nm =/- 1 The 6mm thread (10mm across flats) nuts or bolts for the coils 10Nm Hope this helps
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Hey "Bad Man" - you are a Good Man as far as I am concerned because that is precisely the data I was seeking! My Craftsman torque wrench dial is calibrated in both lb-ft and N-m, so there's no problem with the SI units!

I appreciate the help. Nevertheless, I am going to go ahead and purchase the ($$$) 2-volume bentley manual so that I'll soon be more of a knowledge SOURCE for such info, and less of an information absorber...
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Old 11-09-2004, 06:46 PM   #10 (permalink)
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Eric S
The following (though old info.)may shed more light on the torque specs; check it out and let me know how you make out.
http://vinesauto.com/spa.htm

The above URL should do without any doubts!!

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