How do I change spark plugs on 02 clk 430?
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2002 CLK430
How do I change spark plugs on 02 clk 430?
A DIY with pictures would be awesome, I figured the passenger side would be fairly easy, but what about the driver side? What tools will I need for this procedure?
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99CLK320,
Check the DIY thread however, remove the coil packs so you have room to work. There is a plug wire removal tool which is basically a 17mm(I think) offset open end wrench used to remove the wire from the plug and the rest is pretty much straight forward. There is also a flex extended socket for the plug that can make life easier. Here's a pic on ebay
http://www.ebay.com/itm/Mercedes-Spark-Plug-Wire-Wrench-and-Socket-Tool-112-113-/370764751584?pt=Motors_Automotive_Tools&hash=item56534d22e0&vxp=mtr
http://www.ebay.com/itm/Mercedes-Spark-Plug-Wire-Wrench-and-Socket-Tool-112-113-/370764751584?pt=Motors_Automotive_Tools&hash=item56534d22e0&vxp=mtr
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From: Orlando, FL
2015 GL550 4matic
Pretty straight-forward. It's the same on any 55, 430, or 320 engine, I'm sure there is a pretty write-up with pics somewhere, but ft you need pics for this job, then maybe you should take it to a pro...
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2015 GL550 4matic
I really didn't have a problem with standard sockets, extensions, 17mm wrench and patience.
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2002 CLK430
Which spark plugs should I get? On autohausaz I see part 6702 "Bosch Platinum" for $2.75, and part 7422 Bosch Platinum OEM for $5.18.. I really am tempting to get the $2.75 but is it recommended to get the OEM spark plugs..?
Also, do I need anti seize? If so, which one? Anti Seize for copper or for silver grade?
Also, do I need anti seize? If so, which one? Anti Seize for copper or for silver grade?
Last edited by eatbeef40; Mar 21, 2014 at 01:13 AM.
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From: SCV SoCal
2002 CLK430
If the car has Xenons, removing the headlamp washer fluid tank frees up a lot of room.
The 17mm wrench that DL referred to makes removing the wires a breeze. I also own a wire puller, and that wrench is a much better tool on a Mercedes. That wrench is also used to adjust valves on a diesel, so don't be surprised if you see that wording in the description. If you simply pull the wires by hand, there is a very good chance they will be damaged.
Also like DL said, unbolt and slide the coil packs back. I leave the wiring harness attached.
The hardest plugs to get to are the center plugs on the driver's side and the driver's side rear. I use a swivel head ratchet and that makes it easier to R&R the plugs. For the driver's side rear you'll either use a mirror or the feel method. I just feel them.
As for tightening, you're not getting a torque wrench on many of those of those plugs. Bosch has a method to properly tighten their plugs. A picture is worth a thousand words, and it is dead simple, so just take a look here.
The 17mm wrench that DL referred to makes removing the wires a breeze. I also own a wire puller, and that wrench is a much better tool on a Mercedes. That wrench is also used to adjust valves on a diesel, so don't be surprised if you see that wording in the description. If you simply pull the wires by hand, there is a very good chance they will be damaged.
Also like DL said, unbolt and slide the coil packs back. I leave the wiring harness attached.
The hardest plugs to get to are the center plugs on the driver's side and the driver's side rear. I use a swivel head ratchet and that makes it easier to R&R the plugs. For the driver's side rear you'll either use a mirror or the feel method. I just feel them.
As for tightening, you're not getting a torque wrench on many of those of those plugs. Bosch has a method to properly tighten their plugs. A picture is worth a thousand words, and it is dead simple, so just take a look here.
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From: Orlando, FL
2015 GL550 4matic
Bosch 7422 is OEM. I went with those from Autohauz. I always use anti-sieze, just the little packet at the counter of your local auto parts store, small dot on each one. They don't need to be too tight. Resist the urge to put too much force on spark plugs. Nice and snug should do it.
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MBWorld Fanatic!
Joined: Dec 2011
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From: Orlando, FL
2015 GL550 4matic
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I'm sure other people in your life have.
Newbie
Joined: Jan 2025
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Wasn't looking, you were easy to find.
Forums like these are here to help people do it themselves.
We all know that we can "go to the pro" that's not why were here.
You didn't have and technical advice or tips to offer.
So how did you help?
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From: Hollywood, CA
W209, W124
You exhumed an 11 year old post to argue with the poster.
