jopsis_c63s

I hope it's final, too.

Anyway, I have already sent the reference of the grease of the Mercedes to the mechanic, in case it is needed in the future.

PaulC63s

Had the same thing going on, I had to pull the valve motor out heat the spring and make it so it gives out more pressure to the butterfly valve. PITA to install it back with the additional pressure. Never heard a single cling after.

Jimmy_c63s

Right 👍
What did you heat the spring with? Did you "pull" the spring outwards while it was heated to expand it more so it's a tighter fit when you install everything again?

This is mine at the moment.

PaulC63s

I used a regular propane torch. No you don't pull the spring outward you have to somehow heat it and twist it so it gives out more "spinning force". I forgot which way it was. Get under the car and play around with the butterfly valve to see in which position its closed and tension the spring so it shuts the valve more securely so it shuts it more effectively eliminating the rattle. Do not go crazy with over tensioning it as it will be hard to install. Basically you need to get a feel of it. Apply a dab of WD- 40 specialist in the middle of the spring before re-installing. Sorry its kind of hard to explain specialy with English not being my first language.

Jimmy_c63s

Thanks for explaining as best as you can, I get what you're saying now. You heated just the top part of the spring (where it sits on the actual butterfly valve) and slightly bent it to an angle so that it sits really hard into the exhaust flap spindlebutterfly valve 👍

When you heated the top of the spring, did you need to heat it until it was red hot in order for it to be deformed? I just don't want to overdo the heating and completely destroy it 😅

untamedd

So much work. Just chop it off and weld it shut. Simple.

PaulC63s

Just pull the spring off the motor assembly and secure one end of it somewhere heat it and twist it, take a picture of it how it looked originally. The middle notch thing is what you twist. A little bit is enough like I've said you have to feel it. I had my car on a pair of jacks when i did this and before i got it just right i had to get under and back out a couple of times.

Jimmy_c63s

Right, will give it a go later and take pics. Thanks for the tips mate.

George_1992

Yeah but you'll need an AWE simulator plug, right?

Regards,
George Lisciandro

untamedd

correct

PaulC63s

Some people state that the car will loose its low end growl when this is done and it makes sense. AMG tech put that valve there for a reason.

untamedd

wrong.

The car loses its growl if you keep the valve open.

i know this because initially I thought keeping the valve open would equal max sound but like you said the car lost its growl.

welded a metal disc in between after and voila all the growl was back without the annoying rattle.

This H valve is just too faulty. Even the one I got with the AWE Track exhaust started rattling. Could have ordered a new pipe under warranty but wanted a more permanent solution so fixed it the same way

PaulC63s

So what's the valve for if it's not sound? Im running catless with stock PE exhaust and to be honest its hard to come by a better sounding car.

untamedd

The H valve isnt really there for sound volume per say like the muffler valves are.

honestly i dont know the technicalities since im just speaking from the experiments I did from which i can conclude:

The H valve actually closes under load to change the tone of the sound giving it that growl (confirmed via the fact that a welded closed H valve sounded much more rowdy than a fully open one)

Stamat

Hello, I've been with my C 63S for almost two months now and I just noticed that when accelerating with the exhaust valves open the car makes a squeak, with the valves closed it does not. To be exact you can hear the screech when decelerating.
Does this happen to everyone?
Thank you.

Jimmy_c63s

Yeah it's been discussed here: C63s Exhaust Rattle.

Mods please merge topics.

Wolfman

Threads merged

ansonkk1

Anyone know where I can get a new spring for the valves without spending $250 for a new exhaust actuator?

Jimmy_c63s

What happened to your spring?

ansonkk1

I had to take it out to install a new exhaust, now I went back to stock and only found 2 of them

Jimmy_c63s

You'll need to buy another one as the springs aren't sold separately. Just get a second hand one off ebay.

Jimmy_c63s

Should've just listened to you from the start! 😤

After over a year with this rattle i've finally decided to be done with it and get it welded shut.

I've got my secondaries removed but wanted to ask you:

• Did welding the H pipe "closed" cause any drone with a secondary cat delete?
• Does it cause any difference in sound in full comfort (quiet) mode?
• And did it make cold start any louder (I don't want that).

Thanks mate.

untamedd

hey the safe answer to your questions is no. Welding the H valve shut isnt a mod per say since even when welded its still in a position that it went in stock mode too. Now if you got rid of the mufflers then id answer yes to all lol

Jimmy_c63s

Thanks man, yeah I get you 🙂

How about in full comfort mode with the exhaust flaps set on quiet? With the the H flap permanently welded shut, did it sound normal to you in full quiet mode? Only asking cos even though I have secondaries out, I always use comfort mode with exhaust on quiet when driving around my elderly mother to her appointments 😆

Al Ba

Is this the same issue? Attached video