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Old 04-15-2003, 12:09 PM
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Simple Spark Plug Question 300E

So I went to check out my plugs satuday. But I couldn't seem to get them out. This is the one simple task I've never done, so i don't really know if they should be so tight... I just don't want to break anything trying to take them out. Should i use some penetrating oil ie. WD40?

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Old 04-15-2003, 12:17 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,157
They are taper seat design and take a fair amount of breakaway torque. Always install them with a torque wrench to 10-12 lb-ft.

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Old 04-15-2003, 12:24 PM
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Join Date: Oct 2001
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.......... and you may want to apply a little anti-sieze compund to the threads of the replacement plugs before installing them.
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Old 04-15-2003, 03:11 PM
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alright, thanks guys
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Old 04-15-2003, 03:18 PM
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
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We're talking plugs, not plug wires, right?

The plug wires require either the special MB tool (or a pair of pliers, in a pinch) for removal. Otherwise you can break the holder(s).

And yeah, over a several-thousand mile period, the differing alloys of the spark plug and cylinder head coupled with heat creates a chemical reaction that essentially "welds" the plugs to the head...hence the herculean effort required to remove them!
2009 ML350 (106K) - Family vehicle
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Old 04-15-2003, 09:55 PM
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haha, so I shouldn't just pull on the wires??? Oops.... they actually came off with with incredible ease, but then again there almost shot too.

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