Tbbt CLS

Glad you got lucky! Quality gapping tools have a feature that enables you to change the gap without going caveman style.

rumb

Gap tool - been around for decades.

Plug change is @ 3 difficulty. I just pulled to covers off and saw what to do.

NoVAe63s

How’s the old saying go? If all you have is a set of channel locks everything looks like a spark plug?

Never seen a plug gapped that way. I guess it’s a half-step better than banging on the electrode with a hammer.

CLSPilot

Do the NGK plugs index the same as the OEM ones? Do you know? Be careful. There was a bulletin out there. Wrongly indexed plugs will put a hole in your cylinder. Not because of interference, it will be the flame front and heat that will do it. How did you torque your plugs down? Maybe I missed something but it seems you used the electric jig? Hope you didnt overtorque... or under. OEM plugs index properly under the right torque. Not sure about the NGK's.

When I got my tune from OE, I did a plug change, but I used new OEM plugs and a torque wrench. I also changed all the boots since they were cheap enough. Only thing original are the actual coil packs.

Hope with your tune and non OEM plugs, you dont melt the side of your pistons. Maybe you'll be fine. Who knows. Maybe Mercedes just put a bulletin out for no reason. Or maybe your NGK's indexed in the same place the OEMs needed to. Hopefully you double checked that.

Mssidah

Why is it so hard for you to change the name of the post? No one will ever find this post when they needed it

Firewood

Tool looks nice but I'm not going to buy it. My 6.5 rating is based on someone having limited automotive experience and limited tools and knowledge. Basically I'm comparing Alex from "Legit street cars" to Sam Crac. For Alex it would be a 2-3.... for Sam it would be a 7.


BTW: these are youtubers that I watch and subscribe to

Firewood

Changed the title to a more searchable item.

Firewood

I might do a torque index test to see if there's a difference to make people feel better about this. I'll buy a nut......place it in a vice.......mark the plugs with a index line and torque to spec on each. Hell, I'll do it and post pics and results in this thread.

Sallies.....got to please the Sallies.


BTW: I'm over 900 miles since the plug change and zero problems.

CLSPilot

That's cute. I was trying to be helpful. But as others have noted, you're pretty much an ******* and unwanted here. I was saying that the plugs need to be indexed for a reason. The OEM plugs, when torqued to spec, they will automatically be indexed. The NGK's, not so sure. So you can torque to spec all day at 17ft lbs and they still not index properly. 900 miles isn't a lot of miles. Maybe you won't burn a hole in the piston. Maybe you will. MB put out a bulletin about the NGK plugs that had pics of a hole in the cylinder. I know some people do it anyway and have no issues. But it was enough of a problem for MB to address it though.

Do what you want with your car. I really could care less so no need to please the Sallies. Like stated above, was trying to be helpful to the forum. Take care.

rumb

So a timing chain change would be a 28 on scale of 1-10? I guess it like giving out participation trophies. You're the one that said it was a 6.5 and then listed all your "creds". I'm still trying to figure out why such a good mechanic as yourself had to go buy new tools to do a spark plug change.

Tbbt CLS

I was thinking the same thing!

rumb

Sam crackhead : hey Mom I just changed the sparkplugs and there were 6.5 ,so I'm going to go out and pull the engine since it's probably an 8.

cls5504matic

In all honesty how hard is changing the sparks on this car. Is this a PITA like a tight traverse six? Is there a MB write up of it? I do appreciate the DIY paradigm as well.

rumb

Pull covers, pull coil packs, change plugs. Everything is accessible. @1 hour taking your time.

MB WIS would be the workshop manual for all work on their cars. Many versions available on fleabay.