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Old 08-05-2002, 07:58 PM
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Question the spark plugs replacement

Hello people

I have a 1997 C280, can any one describe me the steps of how to replace the spark plugs. and what shouldI be aware of ?

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Old 08-05-2002, 10:02 PM
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Join Date: Aug 2001
Location: At Sea
Posts: 1,729
here's a procedure Gillybenztech gave me once. it's the same engine (M104), the layout is basically the same on your car. read it through and see if you can follow the steps on your engine. ask if you have questions.

MB plugs Bosch F8DC4

First the cross-over tube comes off. The air cleaner side has 2 catches that are released, the intake side is a little trickier. If you look down where the cross-over tube bends down you will see there is a clamp around the rubber adapter that the cross-over fits into. You can usually loosen this clamp with a long phillips or standard screwdriver. Then you will notice the 2 10mm nuts that also hold the crossover to the valve cover, remove these nuts as well, then the crossover can be removed, being careful to not stress the air intake temp sensor. You can remove the temp sensor if you'd like. Next the screws that hold the coil cover in place can be removed, these all have 5mm allen heads. Once these are all removed, the coil cover can be removed, it's a tight fit at the rear, but it'll come off no problem. No tools are normally required to remove the coils and wires. There are 3 coils above 3 of the plugs, and these each feed 1 other plug through a normal secondary ignition pigtail. I recommend marking where everything was prior to disassembly. Just mark the front one "1", the next one back "2" and so on to aid reassembly. The coil has a label on top that a magic marker will write on. On the ones without the coil you can mark a piece of masking tape or duct tape and stick it on there. The coils will simply pull off, as will the ones with the pigtail, all though not as easily as the coils. Just lay it all aside, leave it all connected. It's not that hard to reassemble. Remove the plugs, gap the new ones to .032" (0.8mm), install the new ones and torque to 29nm. Put it all back together and you're done!
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
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Old 08-05-2002, 11:10 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
To add to Joes list:

Before removing plugs, a blast of air will clean the debries out around each plug recess hole.
It is advisable to change the 3 coil to plug boot connector/resistors on the 3 cylinders under each coil while you are there.. a common fatigue item
You may also want to use anti-sieze compound.. [preference call and sparingly]
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Old 08-06-2002, 09:51 AM
Registered User
Join Date: Feb 2001
Location: jErZeY
Posts: 514
Could somebody give me the part # for the coils for my 96' e320 .Fastlane doesn't have them on stock.
96' E320
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