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Engine How To: Swap exhaust valve spring

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izybluffen said:
So this is pretty simple, takes less than 5 mins. Get down to the valve actuator, undo 3 x 8mm nuts, (i think its 8) pull the actuator off and this is what you'll see:
View attachment 19695

Then this is the base, you can see the two slots the spring sits in, this is what the spring turns to open/close the valve:
View attachment 19696

Then rip out the old one and bang in your new spring, they just clip in and out:
View attachment 19697
Then put it back together. You dont really need to worry about seating the spring in the slots. It will land in there and once you start the car you will hear a click and the spring is where it wants to be.
Don't worry if you lose some exhaust sound..... The spring is new and more rigid and needs a couple of days to settle. The sound will come back.

This mod will add 20 HP instantly šŸ˜
Click to expand...
I just got my car back from the dealer today and I told them about the exhaust rattle. They said they will replace the actuator. I told them Iā€™ve researched the issue and that the spring is actually the issue and if the actuator is replaced it will just do it again at some point. Tempted just to let them do it anyway as itā€™s a new part at their expense? Any chance a new actuator will have an upgraded spring it or something? My car was built June 23 and has 2000km on it. Any downfalls to getting the new actuator (apart from it failing again at some point)?

Edit: no idea why it keeps posting it twice!
 
has your dealer fixed the rattle now?
 
rover137 said:
No not yet. It will go in for a fix in a week or two.
Click to expand...
I have read here somewhere that there is an aftermarket spring that is of a higher quality. An option is to get this and have a mechanic fit it at a small cost given it is apparently as simple task and have a more permanent fix. I have an April 23 build sedan that I think may have this issue as well.
 
i just replaced mine with a flow down, i tought it would solve the rattle wich i only hear at 1800 rpm..

And offcourse the rattle at 1800 rpm isn't gone, anyone know what could cause the ratle. I hear it in the cabin, but not at the exhaust
 
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Well, I got a replacement spring for mine. The good news: it did solve the rattle I had when coasting at mid-revs. The bad news: getting the damn rusted bolts off was a pain, and caused me to break one of the plastic inserts which holds the actuator casing tied down with the bolts. So now I have to figure out how to fasten it properly. I'm thinking of clamping it with some kind of clamp. Any ideas?
 
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1njgpoqiwohicy.jpg
masterproof-professional-edelstahl-kabelbinder-10-teilig-rostfrei-und-hitzebestaendig-200-350-mm~2.jpg


Hi Goran one of these should work, the metal zip tie in my opinion is a lot more flexible as a clamp. You can try super-glue on the broken plastic part.
 
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i_twenty_N said:
1njgpoqiwohicy.jpg
masterproof-professional-edelstahl-kabelbinder-10-teilig-rostfrei-und-hitzebestaendig-200-350-mm~2.jpg


Hi Goran one of these should work, the metal zip tie in my opinion is a lot more flexible as a clamp. You can try super-glue on the broken plastic part.
Click to expand...

1746340563336.jpeg

Yeah, I thought of such a tie, even bought one, but it would need to be placed diagonally because the weld is right below where you would want to put it. So I opted for a simpler solution with a wide washer, at least as a start to see if it wonā€™t fall off. Iā€™ve put a dab of paint on it to prevent it from unscrewing.
 
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Goran said:
Well, I got a replacement spring for mine. The good news: it did solve the rattle I had when coasting at mid-revs. The bad news: getting the damn rusted bolts off was a pain, and caused me to break one of the plastic inserts which holds the actuator casing tied down with the bolts. So now I have to figure out how to fasten it properly. I'm thinking of clamping it with some kind of clamp. Any ideas?
Click to expand...
Have this replacement planned as well! Quick question -- what uprated spring did you opt for? Also do you by any chance have an image of the plastic insert that holds the actuator? Just so I know what to look out for when doing mine!

(ah just seen the follow up image above -- is that that plastic bit next to the bolt the thing that snapped?)
 
goobyN said:
Have this replacement planned as well! Quick question -- what uprated spring did you opt for? Also do you by any chance have an image of the plastic insert that holds the actuator? Just so I know what to look out for when doing mine!

(ah just seen the follow up image above -- is that that plastic bit next to the bolt the thing that snapped?)
Click to expand...
I ordered the one from MT Tuning.

The thing that broke is best seen in this pic - it's the plastic bit on the left which you screw through.

You can also see how the spring is held in place, if that was your question.

20220317_184520-min-jpg.19697
 
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There are a lot of these springs available on AliExpress for just a few Ā£. This part seems to be used by a great many manufacturers.
 
Cholmondeley-Biscuitt said:
@wasdfight, did you have the same rattle/buzzing issue with the OEM Spring fitted? Your exhaust sounds exactly like mine after I had the GPF-Back system (and spring) fitted to my KonaN. Swapping the spring back to the OEM one did not resolve the issue either. The buzzing occurred whenever the system caused the valve to close against the inner 'mating' surface and it was as if the flap itself was vibrating against the lip where it meets the exhaust tubing. Tapping the valve with a stick or giving it a nudge with my fingers caused the vibration to stop - until the next change in exhaust mode, whereupon it would start again.
It's a real PITA as it makes the car sound like it has a loose or dodgy exhaust when driving around town in Eco/Normal. I tried greasing the mating surfaces inside and lubricating the spring housing with silicon spray but, none of it worked.
After a whole day of tinkering with it on my driveway and packing the spring housing with silicone grease I thought I'd cracked it - until I was driving with my window open one day and noticed the buzzing bouncing back at me from the walls of houses etc ... In the end I disconnected the valve motor so that it is permanently open and am still running with it like that, because that buzzing did my head in!
Below you'll find links to how it sounded on my KonaN before I pulled the valve plug. I couldn't hear it too well in the first video, so I shot a second one close-up. It won't solve your problem but, at least you know your not alone in this!

Video 1:

Video 2:
Click to expand...
Did you ever find a workaround to this problem - I thought I had a dodgy spring, replaced it and still have the same rattle, almost identical diagnosis as yours - could really do with a solution!!
 
Just installed a RPM performance upgraded spring. Took 5 mins and works great. No more rattle at certain revs in N mode.
www.ebay.co.uk

RPM Performance Hyundai I30N, I20N and Kona N Upgraded Exhaust Spring | eBay UK

Our exhaust springs are manufactured out of a superior material and we have changed the spring rate so that the spring will not weaken or snap due to the heat. o Fits all Hyundai I30 N & I30 Fastback N & Kona N & I20N & Veloster N.
www.ebay.co.uk

Make them a offer!.
 
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