I've got a C5Z06 with 18,000 miles on it.

I noticed when shutting of the engine sometimes I get a rattle sound. When I have the clutch pushed in and shut-off the engine I don't get the rattle.

According to the "sticky" (weights, measurements, ratios) in the C5 General section. It says the following:
On manual transmission cars (M6 or M12), the transmission sounds like it is rattling when leaving the line. It is normal. It is the clutch throwout bearing rattling around. Sometimes you'll hear a horrible rattle if you shut off the engine. If you press the clutch pedal in while shutting off the car, you won't hear it.

I just want to know if other people have experienced this, or should I worry?!

 

Is this something new or has it always done it? I get a rattle, and I don’t like it, but I would not call it “horrible”. If it is something new or just started, I would be concern.

Hope you get it figured out,

Eric D

 

I just got the car a week ago. And it's been doing it since I picked it up. I didn't notice it on the test-drive, because it only happens sometimes.

When I push the clutch the rattle never happens.

 

completely normal, all C5's do this when you shut off the engine, just press the clutch pedal before you shut it off...

 

Thank you, good to know!

 

Yep, yep.. nothing like rattling throw out bearings.

 

Mine rattles when the clutch is pushed in because it's a twin disc clutch. The intermediate plate rattles.

 

i know the sound you guys are talking about and mine does it too, but has anyone ever noticed the same sort of sound but not as loud when you let the clutch out to move at a stop sign or shifting into 2nd? i had my windows up Saturday and noticed that the sound sounds like its coming from below the radio (under console) not in interior of car

 

So why does the throw-out bearing rattle? I've never had that happen on any other manual car I've owned?

 

It's not the throw out bearing .......

The Corvette drivetrain is an "extended" drive train. Picture two scenarios to help understand this .... in both scenarios my foot is off the clutch .... gearbox in Neutral.

1) REGULAR car ..... besides the engine the only moving parts are the clutch assembly and the input shaft to the gearbox.

2) CORVETTE .... besides the engine the clutch assembly is turning along with the propeller shaft in the torque tube which is "driving" the input shaft in the gearbox.

When I turn off a Corvette (in Neutral and my foot OFF the clutch pedal) there are a whole bunch of rotating parts that come to a stop. Each part has a different weight or mass, and slows at a different rate. Because there is some slight "slop" between the parts, the difference in the speeds causes the parts to "rattle" against each other.

If you don't want to hear the rattle .... step on the clutch pedal and turn off the engine.

The Corvette "death rattle" is normal because of the design of the car .... the tranny is in the rear .... not the front of the car.

 

Excellent explanation! So, is it correct to assume, then, that WHEN I shut the engine off with my foot on the clutch pedal... the only rotating components left in motion are locked together as one piece, and therefore do not rattle? As far as I understand... when the clutch pedal is not pressed, the entire driveline rotates all the way back to the transmission. But with the clutch pedal pressed, the clutch (which is up front) disengages and separates the drivetrain from that point and aft. Is my understanding correct?

And to Jameel... I remember when you posted last month about the car you were looking at. Now I see you have one. congrats! The noise, as was said above, is normal... mine's done it the entire time too. Just shut the car off with the clutch pressed, and you're golden.

 

Thanks BlazkZ06, great explanation.

Hey Alaskanpilot, thanks a lot.
Yah it's a different car also an 03 and yellow. It only had 18500 miles, 1 owner Canadian car. Amazing condition. In fact because of the low kms and great condition it qualified for the GMPP warranty.

 

There ya go.

Normal. Not to be worried about.

NEXT!

best regards -

mqqn

 

Have you folks read the manual? Or at least watched the video?

It's clearly explained in both.

 

Your explanation (in blue) is probably better than mine .... EXACTLY the right way to put it.

 

I've read parts of the manual. What page(s) mention this phenomenon?!

I didn't have a tape with my car. I don't know if the previous owner removed it or Canadian cars didn't come with the tape. Where can I find a copy of this video. Is it posted on youtube ?

Thanks.

 

Almost 12 years later, and this thread just answered some concerns for me. This forum is a fantastic place, to learn and troubleshoot!

 

Completely normal. I never hear it though. Out of habit (good or bad) I always turn the car off with the clutch in and out it in gear when it’s off.

 

1/ You need to get out more.

2/ Will that make your life better?

Seriously, that sounds like an exhaust rattle to me!

 

He said he just bought the car a week ago. Go easy on the poor guy.