Spark Plug Change
Super Member
Joined: Jul 2009
Posts: 938
Likes: 53
From: Montreal, Canada
2005 C240 2011 R350
Honest I dont remember... but one of the toughest parts is getting the boot off!
Also.. be very careful. Ease them out slowly... start with quarter turn out then in.. then half turn out and in a quarter etc There is lots of buildup and if you try to do it all at once or with a power driver you risk stripping the aluminium threads on the heads. for the new ones I used a bit of nickel based (the silver coloured permatex stuff) antiseize compound but the plugs should already have an antiseize coating.
Also.. be very careful. Ease them out slowly... start with quarter turn out then in.. then half turn out and in a quarter etc There is lots of buildup and if you try to do it all at once or with a power driver you risk stripping the aluminium threads on the heads. for the new ones I used a bit of nickel based (the silver coloured permatex stuff) antiseize compound but the plugs should already have an antiseize coating.
Member
Joined: Sep 2019
Posts: 159
Likes: 53
Mercedes-Benz S430, S500, S600, and E320 CDI
Getting the boot off is easy if you have this tool.
https://mercedessource.com/store/m11...t-removal-tool
They can also be had on eBay. IIRC, I bought mine on there before I learned that Kent sells 'em, too. Avoid "made in China", but Taiwan's upped their quality game over the years, so they're OK.
As for the spark plugs themselves, yeah, a 10" extension is what I use. Mine came off pretty easily. Yours may not, so yes, be a little careful at first. That Permatex anti-seize compound is great stuff, BTW. And be careful not to over-torque your new spark plugs when you put 'em on! I think the torque spec is 18 lb-ft.
https://mercedessource.com/store/m11...t-removal-tool
They can also be had on eBay. IIRC, I bought mine on there before I learned that Kent sells 'em, too. Avoid "made in China", but Taiwan's upped their quality game over the years, so they're OK.
As for the spark plugs themselves, yeah, a 10" extension is what I use. Mine came off pretty easily. Yours may not, so yes, be a little careful at first. That Permatex anti-seize compound is great stuff, BTW. And be careful not to over-torque your new spark plugs when you put 'em on! I think the torque spec is 18 lb-ft.
Last edited by cowboyt; Jan 17, 2020 at 02:27 PM.
Super Member
Joined: Jul 2009
Posts: 938
Likes: 53
From: Montreal, Canada
2005 C240 2011 R350
Most plugs are pregapped be carefull if you want to adjust the gap . The point is very fine. Not your grandfather's spark plug!
some articles
https://ngksparkplugs.com/en/resourc...ut-spark-plugs
https://www.boschsparkplugs.net/lear...i-gap-my-plugs
some articles
https://ngksparkplugs.com/en/resourc...ut-spark-plugs
https://www.boschsparkplugs.net/lear...i-gap-my-plugs
