Hum/rattling Sound - Disappear With Clutch Pressed

[LancerL]

When I start the car in the morning, most of the times there is a hum (Like two rubbers fastly rubbing together) sound coming in the idle warming up process from the engine for a bout 20-30 seconds and gradually disappear.

As observed this comes from the mid/bottom of the engine.

If I press the Clutch while sound, it goes off immediately and if release the clutch it comes back (Within this 20-30 seconds, it doesn't matter how many times I pressed/released, it will be the same behavior)

No other issue or abnormal sounds in the driving in all gears, but if I run about 10-12 Kms continuously and parked in idle to open the gate or traffic lights. Sometimes I hear a metal rattling noise from the engine compartment which I could not identify where it comes from.

This is more noisy with A/C compressor running with high idle.

For this also it's the same story with clutch Goes away when paddle pressed and comes back when released.

I'm totally confused on what to do as I could not diagnosed where it is coming from and is there a connection between morning noise and this random metal rattling when engine is hot.

Car is Toyota AE110 Petrol Manual.

Experts please help.

[Davy]

Most probably a worn out clutch release bearing.

Take your car to a good mechanic to confirm. If it's revealed that it's the bearing that's making the noise, it needs to be replaced. Get your clutch and pressure plate inspected while you're at it.

[LancerL]

  On 2/26/2016 at 7:59 AM, Davy said:

Most probably a worn out clutch release bearing.

Take your car to a good mechanic to confirm. If it's revealed that it's the bearing that's making the noise, it needs to be replaced. Get your clutch and pressure plate inspected while you're at it.

If it is "clutch release bearing" can it varied the sound with the temperature?

[Davy]

  On 2/26/2016 at 10:49 AM, LancerL said:

If it is "clutch release bearing" can it varied the sound with the temperature?

Yes, it's quite possible for the sound to change when the clutch assembly heats up.

[PerfMad]

Great topic.. I have the same issue.. but haven't notice whether the sound is higher when AC is on.. But idling sound i have noticed several times.. Please let me know your findings on this.

[LancerL]

  On 2/29/2016 at 5:13 AM, PerfMad said:

Great topic.. I have the same issue.. but haven't notice whether the sound is higher when AC is on.. But idling sound i have noticed several times.. Please let me know your findings on this.

Rather it higher when A/C is on, it gives totally a different sound comparing to the sound when engine warming up.

Do you get warming up noise on your Car? or it comes only when engine is hot?

Did you show this to a mechanic? if so what was his observation?

also what is the make and module?

Edited February 29, 2016 by LancerL

[LancerL]

  On 2/27/2016 at 4:06 AM, Davy said:

Yes, it's quite possible for the sound to change when the clutch assembly heats up.

Is it recommended to run on in this condition for a while? Any other damage could be possible due to this?

[PerfMad]

  On 2/29/2016 at 10:28 AM, LancerL said:

Rather it higher when A/C is on, it gives totally a different sound comparing to the sound when engine warming up.

Do you get warming up noise on your Car? or it comes only when engine is hot?

Did you show this to a mechanic? if so what was his observation?

also what is the make and module?

Hey machan,

I have noticed this mostly during cold start, and havent notice it much after its bit warmed up.. I didnt show this to a mechanic yet, because when ever i planned to go there for this, it didnt come. Let me know if you come across any solution or cause for this sound..

Mine is a Mitsubishi Lancer..

[Davy]

  On 2/29/2016 at 10:33 AM, LancerL said:

Is it recommended to run on in this condition for a while? Any other damage could be possible due to this?

No, it's not recommended.

But if you're asking if you can drive the car like this for a while, then probably* - if you're prepared to replace the pressure plate also as part of the repair, because the worn out bearing will damage the diaphragm springs of the pressure plate, rendering the pressure plate unusable. If you attend to the problem now, you might be able to save the pressure plate. Having said that, if your car has a hydraulic clutch (I'm not sure about the AE 110, I'm guessing it's hydraulic), you might run the risk of damaging the clutch slave cylinder which will cause the clutch to fail totally. If the clutch and brake share a common hydraulic reservoir, then your brakes could also fail.

So the bottom line is, the more you delay the repair, the more expensive (and risky) it is going to be.

*All of the above is assuming that this noise is due to a worn out release bearing

Edited February 29, 2016 by Davy

[LancerL]

  On 2/29/2016 at 12:00 PM, Davy said:

No, it's not recommended.

But if you're asking if you can drive the car like this for a while, then probably* - if you're prepared to replace the pressure plate also as part of the repair, because the worn out bearing will damage the diaphragm springs of the pressure plate, rendering the pressure plate unusable. If you attend to the problem now, you might be able to save the pressure plate. Having said that, if your car has a hydraulic clutch (I'm not sure about the AE 110, I'm guessing it's hydraulic), you might run the risk of damaging the clutch slave cylinder which will cause the clutch to fail totally. If the clutch and brake share a common hydraulic reservoir, then your brakes could also fail.

So the bottom line is, the more you delay the repair, the more expensive (and risky) it is going to be.

*All of the above is assuming that this noise is due to a worn out release bearing

Hi Davy

Thanks for the detailed update!

Any idea of the labour charge to replace the release bearing?

As my findings the entire gear box has to be taken out!

Thanks

[Davy]

  On 3/10/2016 at 8:39 AM, LancerL said:

Hi Davy

Thanks for the detailed update!

Any idea of the labour charge to replace the release bearing?

As my findings the entire gear box has to be taken out!

Thanks

Yes, the gearbox will need to be taken out of the car. Since this is a front wheel driven car, it's a bit more complicated than taking out the gearbox of a rear wheel driven car. Plus, you might have to get a wheel alignment done after the repair, depending on which suspension components need to be taken out to access the gearbox.

As for labour charges, I guess it depends on the place you take it to. I've been away from the country for a couple of years now, so I don't think I'm the best person to give you an indication of labour charges. Hope someone else can answer your question.

[LancerL]

Went to the garage yesterday and the conclusion by them was, this is due to loosen springs in the clutch plate. When engine getting hot these springs reduce their tension and start making noise.

I'm not too sure about the statement and they said nothing to worry and I can continue with the sound until the clutch replacement as it is point less of removing the clutch only due to this.

Is this ok to run like this? Will this damage any other parts such as Flywheel or Bell housing?

Experts please help.

[PerfMad]

  On 3/23/2016 at 8:33 AM, LancerL said:

Went to the garage yesterday and the conclusion by them was, this is due to loosen springs in the clutch plate. When engine getting hot these springs reduce their tension and start making noise.

I'm not too sure about the statement and they said nothing to worry and I can continue with the sound until the clutch replacement as it is point less of removing the clutch only due to this.

Is this ok to run like this? Will this damage any other parts such as Flywheel or Bell housing?

Experts please help.

Hi LancerL

Sorry to hear that you still couldn't rectify the issue.. I couldn't check mine after that also and sold mine few days ago. Anyways Its better to get it to another mechanic and get his opinion as well.

Keep us posted on your findings.

Cheers