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I have a strange noise, like a rattling/stomping sound at idle, when pressing the clutch pedal. The clutch and the flywheel (DMF), were both changed with new parts.

Except for that sound, the car handles perfectly.

Has anyone came across something like this?

Thanks!

  • 3
    Was the throwout bearing changed? – Pᴀᴜʟsᴛᴇʀ2 Oct 25 '15 at 17:16
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    My only suggestion might be the DMF is bad. From what I know of DMFs, there are a few moving parts in them. If it wasn't put together correctly, you might hear something when the clutch is disengaged. – Pᴀᴜʟsᴛᴇʀ2 Oct 25 '15 at 21:27
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    If the engine wasn't making any of these noises prior to the clutch/DMF install, you really have to look at what was changed, not at the engine itself. With the DMF attached directly to the back of the engine, you could easily mistake any noises from it as though it were coming from the engine itself. I'd take it back to the shop and have them diagnose again with that in mind. They have probably already figured it out, but don't want to tear the whole thing apart again under warranty. – Pᴀᴜʟsᴛᴇʀ2 Oct 25 '15 at 21:38
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    Definitely sounds like a bad throwout bearing. A bad DMF should make noise when no pressure is applied to the clutch, while a throwout bearing starts making a ruckus when you do. Might be a bad replacement job, lots of things can rattle, take it back to the mechanics. You won't know what's bad for certain without disassembly, good luck. – I have no idea what I'm doing Feb 1 '16 at 9:01
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    @A1rwalker That's a brutal conclusion and I'll say that I didn't expect to hear you had a broken crankshaft. Can you answer your own question and mark it as accepted? – DucatiKiller Apr 9 '16 at 16:30
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According to the OP's last comment, the rattle was due to a broken crankshaft.

I will add one thing though. When I was a kid, my father had a '91 Mitsubishi Pajero that suddenly had its crankshaft snap in two. He was able to drive it to the dealership with a rattling noise that was present regardless of clutch position or RPM.

With regards to the OP's case, I am quite frankly surprised that the rattling noise was present only with the clutch pressed in. Not saying that it isn't possible, just unusual that the OP was able to drive "normally" otherwise.

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They could have left a loose bolt on the preasure plate for the clutch and when you disengage the clutch, the bolt might hit the shell of the trany.

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