2005 c240 needs spark plugs - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 03-06-2013, 10:15 AM Thread Starter
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2005 c240 needs spark plugs

Hi my car needs spark plugs and I'm looking online but there are a lot of options and I want to choose the right one. I was told that my car requires 2 spark plugs per cylinder (so 12 plugs are needed in total) but others have said it should only be 1 per cylinder. So I have two questions) what's a good brand of spark plug (a url link to them would be awesome) that I'm not getting ripped off on and do I need 12 or 6? Thanks
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post #2 of 7 (permalink) Old 03-06-2013, 10:33 AM Thread Starter
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post #3 of 7 (permalink) Old 03-06-2013, 10:58 AM Thread Starter
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well I ordered those, ordered 12 of them, hopefully it works out for me.
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post #4 of 7 (permalink) Old 03-06-2013, 11:45 AM
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Do you have the special tool that is claimed to be the best way to pop off the plug leads..? Otherwise you might break something. Should be OK for your M112 engine.

There will be posts about this tool in the archives.

http://www.benzworld.org/forums/w203...lug-tools.html
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post #5 of 7 (permalink) Old 03-06-2013, 12:52 PM
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Originally Posted by carfo View Post
well I ordered those, ordered 12 of them, hopefully it works out for me.
Those plugs are perfect, closest thing to what your engine had when it left the factory.

Please take a minute to click user cp and edit details, where you can easily add your vehicle and location to your profile, it's often useful information when you're seeking assistance.

Also, please note that you posted in the general forum requesting information about a specific model, which can lead to delays in information or even misinformation. You're much better off posting in the W203 sedan forum, which is native to your car. Lots of great info in there.

Definitely get the 17mm offset wrench, it's under $20 on ebay, makes dealing with the ignition wires a breeze. And test them while you're changing the plugs, they do wear out.

Good luck.

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post #6 of 7 (permalink) Old 03-06-2013, 05:11 PM
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it is not that easy , the last plug on each side is tight to get to . the plug connectors are tight , off and on . i always do it on a hot engine , the plugs come out easier . use a little lube on the treads , do one side at a time , mark the coils [ felt pencil ] remove them , use a long / swivel handle 3/8 rachet , and short extensions .when you put connectors back on they must snap in . take a look at the 2 plug wires , one for the front plug , one for the rear .there is a picture there .
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post #7 of 7 (permalink) Old 03-06-2013, 06:10 PM
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Ummm...don't use anything on the threads of the new plugs when you install them. Bosch specifically says not to (their threads are specially coated) and it will cause you to overtighten them.

As to engine temp...there are people in both camps. I will say that a hot engine is much more difficult to work on (it's really easy to burn yourself, and the tight confines near the exhaust don't make it any easier) and people have pulled threads right out of the head with the plug because it's harder to "feel" it not breaking loose. Remember, this is an aluminium head and basically a steel threaded insert; those two metal compounds expand and contract at much different rates.

The plugs fire sequentially, so you have to get the wires back on the plugs in the exact order in which they are removed. Since I recommend that you test and inspect them, simply remove them one at a time and mark them so you can put them back in the same spot (assuming they all test okay). Pulling all of the wires and marking them will also give you lots of extra room to work.

Ultimately, proceed as you deem best, but do so with extreme caution. Pulling a head so it can have a thread insert installed is something no one should ever have to do, at least IMHO.

Good luck, carfo.

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