Spark plug torque and process
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Joined: Mar 2023
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18 c63 s sedan
Spark plug torque and process
Car has hit 52k, time for new plugs. Got 8 from FCP euro. Watched videos online , the two that are on YouTube.
Question is what’s the torque spec and procedure for the plugs? I’m assuming no anti seize. What’s the spark plug gap for a factory tune S, as I don’t trust pre gapped I always make sure.
on driver side the fuel line that needs to come off. How tight do we put it back on? Should be able to fit a torque wrench with an open end wrench attachment.
if anyone has the factory procedure, would be nice to have.
Question is what’s the torque spec and procedure for the plugs? I’m assuming no anti seize. What’s the spark plug gap for a factory tune S, as I don’t trust pre gapped I always make sure.
on driver side the fuel line that needs to come off. How tight do we put it back on? Should be able to fit a torque wrench with an open end wrench attachment.
if anyone has the factory procedure, would be nice to have.
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From: unbegrenzt
2017 GLE350 4MATIC
Car has hit 52k, time for new plugs. Got 8 from FCP euro. Watched videos online , the two that are on YouTube.
Question is what’s the torque spec and procedure for the plugs? I’m assuming no anti seize. What’s the spark plug gap for a factory tune S, as I don’t trust pre gapped I always make sure.
on driver side the fuel line that needs to come off. How tight do we put it back on? Should be able to fit a torque wrench with an open end wrench attachment.
if anyone has the factory procedure, would be nice to have.
Question is what’s the torque spec and procedure for the plugs? I’m assuming no anti seize. What’s the spark plug gap for a factory tune S, as I don’t trust pre gapped I always make sure.
on driver side the fuel line that needs to come off. How tight do we put it back on? Should be able to fit a torque wrench with an open end wrench attachment.
if anyone has the factory procedure, would be nice to have.
No anti seize. Factory gap (don’t gap them).
WIS and torque spec has been posted dozens of places on this site.
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Joined: Mar 2023
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18 c63 s sedan
I always check plug gap, trust but verify. Figures on anti seize, haven’t seen its use on modern plugs for a while. I didn’t find the WIS
on mobile if it makes any difference
Last edited by Spicywolff; Dec 15, 2023 at 01:24 PM.
Out Of Control!!
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From: unbegrenzt
2017 GLE350 4MATIC
I searched both google and the search function on here. The search function didn’t home in on the specs I needed. Just questions about plugs including other engines.
I always check plug gap, trust but verify. Figures on anti seize, haven’t seen its use on modern plugs for a while. I didn’t find the WIS
on mobile if it makes any difference
I always check plug gap, trust but verify. Figures on anti seize, haven’t seen its use on modern plugs for a while. I didn’t find the WIS
on mobile if it makes any difference
Coil screws 9Nm
Same as BMW and Porsche. BMW and Porsche use 8Nm on the coil screw. Close enough.
The torque specs are for M276/M157/M278. I doubt they are different for M177. It's your call. If you are experienced with DIY, this is not a big deal. 17mm thin wall socket for the plugs.
YouTube has a couple of videos.
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18 c63 s sedan
Plugs 23Nm
Coil screws 9Nm
Same as BMW and Porsche. BMW and Porsche use 8Nm on the coil screw. Close enough.
The torque specs are for M276/M157/M278. I doubt they are different for M177. It's your call. If you are experienced with DIY, this is not a big deal. 17mm thin wall socket for the plugs.
YouTube has a couple of videos.
Coil screws 9Nm
Same as BMW and Porsche. BMW and Porsche use 8Nm on the coil screw. Close enough.
The torque specs are for M276/M157/M278. I doubt they are different for M177. It's your call. If you are experienced with DIY, this is not a big deal. 17mm thin wall socket for the plugs.
YouTube has a couple of videos.
any idea about the fuel line you have to undo? Thanks for the 17mm thin wall, I’ll get one purchased.
any idea on the plug gap?
Thread Starter
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Joined: Mar 2023
Posts: 161
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18 c63 s sedan
I know how the line comes off, I meant does it have a torque spec to retighten it. Or good and tight is fine
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From: Miami, Florida
W205 C63 AMG Coupe
The biggest pain in the butt is going to be getting the coil packs pulled off of the spark plugs. They're really stuck on there.
17 ft-lbs of torque on the spark plugs. I just put the coil packs and the fuel line screws back on good and tight (don't crank on the screws).
17 ft-lbs of torque on the spark plugs. I just put the coil packs and the fuel line screws back on good and tight (don't crank on the screws).
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From: Arizona
c450
Btw once when I was doing plugs for a friend, I checked the gaps on the oem plugs and although they are pre gapped some of them were off. Would just do it while your at it doesn’t take long to check.
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18 c63 s sedan
Thread Starter
Member
Joined: Mar 2023
Posts: 161
Likes: 32
18 c63 s sedan
The biggest pain in the butt is going to be getting the coil packs pulled off of the spark plugs. They're really stuck on there.
17 ft-lbs of torque on the spark plugs. I just put the coil packs and the fuel line screws back on good and tight (don't crank on the screws).
17 ft-lbs of torque on the spark plugs. I just put the coil packs and the fuel line screws back on good and tight (don't crank on the screws).
Thread Starter
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18 c63 s sedan
that’s why I always check. I knock bosch says on FAQ they don’t need to be gapped. But I always check and verify. No one here has been able to provide me the gap spec.
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From: Arizona
c450
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From: Arroyo Grande, CA
w205 C63s, w212 E63,w219CLS500-SOLD! w211 E63, 2006 E60 M5 (KABOOM!)
You DO NOT need to mess with the fuel lines at all. I used an exhaust spring tool from my old dirt bike days (it's a hook with handle on it) to pull the coil packs. I spent about 30 minutes pulling the first one and then went into my toolbox to look for "something to help." Once i found the spring puller, it took about 30 seconds to remove each of the other 3 coil packs. On the drivers side rear, I just bent the heat shield out of the way to allow for clearance of the coil pack. Once done, it bends right back into place. The job took me about 2.5 hours all said and done. After having done it, I could probably shave close to an hour off that. I did use anti-seize as at 30k, the plugs seemed way tighter than they should have been to remove. With the anti-seize, I expect they will come out a bit easier ant the 60k mark.
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From: unbegrenzt
2017 GLE350 4MATIC
Anti seize changes the torque and therefore the spark plug electrode indexing.
Good to know that bending the heat shield allows clearance to avoid opening the fuel pipe.
I use a liberal dose of dielectric grease inside the coil boot when reinstalling the coil. MB at the factory uses an assembly grease which dries to a hard glue due to engine heat. This is the reason the coil boots are difficult to remove. After applying dielectric grease, the next spark plug change is a breeze when it comes to removing the coils.
I change coils on non-high performance engines between 70k and 100k miles, whenever I get the urge. On a high performance engine like this I would change coils in the 50k-70k mile range. It makes a differences, coils don't last forever and they degrade over time. Buy OEM MB coils from the dealer, too much substandard junk from Asia in the market for electrical parts.
Good to know that bending the heat shield allows clearance to avoid opening the fuel pipe.
I use a liberal dose of dielectric grease inside the coil boot when reinstalling the coil. MB at the factory uses an assembly grease which dries to a hard glue due to engine heat. This is the reason the coil boots are difficult to remove. After applying dielectric grease, the next spark plug change is a breeze when it comes to removing the coils.
I change coils on non-high performance engines between 70k and 100k miles, whenever I get the urge. On a high performance engine like this I would change coils in the 50k-70k mile range. It makes a differences, coils don't last forever and they degrade over time. Buy OEM MB coils from the dealer, too much substandard junk from Asia in the market for electrical parts.
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Joined: Mar 2024
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2018 C63s
Plugs 23Nm
Coil screws 9Nm
Same as BMW and Porsche. BMW and Porsche use 8Nm on the coil screw. Close enough.
The torque specs are for M276/M157/M278. I doubt they are different for M177. It's your call. If you are experienced with DIY, this is not a big deal. 17mm thin wall socket for the plugs.
Coil screws 9Nm
Same as BMW and Porsche. BMW and Porsche use 8Nm on the coil screw. Close enough.
The torque specs are for M276/M157/M278. I doubt they are different for M177. It's your call. If you are experienced with DIY, this is not a big deal. 17mm thin wall socket for the plugs.
Torque values look fine above. But I have a question on the factory plug gap as I see conflicting information on the forum and videos available.
I've seen and read recommendations for .025in gap. The NGK/MB plugs seem to come with a consistent .028-.030 gap in the box as I just measured them. Should I re-gap or just install them as-is, from the box? They are all pretty consistent at that measurement so it looks like they are that way by intent. This is for a 2018 C63s.
Thanks - AJ
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Posts: 161
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18 c63 s sedan
Just a quick check here - I think the socket sizing is a typo switching in the torque as Ft. Pounds. The OEM NGK/MB plug for the M177 uses a 14mm thin wall socket - please correct me if I'm wrong here.
Torque values look fine above. But I have a question on the factory plug gap as I see conflicting information on the forum and videos available.
I've seen and read recommendations for .025in gap. The NGK/MB plugs seem to come with a consistent .028-.030 gap in the box as I just measured them. Should I re-gap or just install them as-is, from the box? They are all pretty consistent at that measurement so it looks like they are that way by intent. This is for a 2018 C63s.
Thanks - AJ
Torque values look fine above. But I have a question on the factory plug gap as I see conflicting information on the forum and videos available.
I've seen and read recommendations for .025in gap. The NGK/MB plugs seem to come with a consistent .028-.030 gap in the box as I just measured them. Should I re-gap or just install them as-is, from the box? They are all pretty consistent at that measurement so it looks like they are that way by intent. This is for a 2018 C63s.
Thanks - AJ
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Joined: Jan 2021
Posts: 107
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C7 Z06
I thought this wouldn't be too difficult, but I've tried 2-14mm deep sockets. Neither one will grab the stock plug! 1 was a 12 point too. I ordered an extra deep socket that is coming tomorrow morning, but I fear my plugs are wrong as the sockets I've tried on the car DO fit the plugs I bought, so I'm worried the plugs I got are shorter than the ones in the car.
I bought Mercedes Benz A 000 159 05 00 plugs.
The plugs I got are branded Mercedes Benz.
Any thoughts?
I bought Mercedes Benz A 000 159 05 00 plugs.
The plugs I got are branded Mercedes Benz.
Any thoughts?
Last edited by Dr.Ron; Oct 5, 2024 at 02:14 PM.
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Joined: Nov 2022
Posts: 20
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C63 AMG Coupé
I've just recently done my spark plugs. I think the part number is correct. That's the same one I have used to order them.
I'm not sure, if I got you correctly, but I think the outer width of the socket could be an issue. It has to be pretty narrow.
Do you get the plugs currently in your car out? If yes, you could just compare them. If not, I think the socket could be to wide on the outside.
I'm not sure, if I got you correctly, but I think the outer width of the socket could be an issue. It has to be pretty narrow.
Do you get the plugs currently in your car out? If yes, you could just compare them. If not, I think the socket could be to wide on the outside.
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Posts: 107
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C7 Z06
