Transmission rattle at idle with clutch out

[bighitbiker3]

So I've done quite a bit of searching and am getting a lot of mixed opinions. I recently have been noticing a rattle at idle, but only sometimes. When I rev up to about 1.3k the noise goes away. If I let it idle in neutral and the clutch is pushed in, the noise goes away. If the car is cold it doesn't make noise. It only rattles with the car warm and the clutch pedal out.

Is this a throw out bearing? Or is it a bad input shaft bearing? Getrag rattle?

[FLG]

Sounds like typical getrag rattle. Do you have a lightned flywheel? Generally that makes things worse.

The hotter it is, typically ive noticed the louder it is. Some people ask me if my engine is knocking, i push in the clutch and they look at me with a confused face.

[wilholl]

^^This^^

[ascendotuum]

My car has this same exact problem. If I let the clutch out ever-so-slowly it won't do it (sometimes). I just bought this E30. It has M52b28 swap with ZF trans. The PO says this is from the dual-mass flywheel and is normal.

It makes the car sound like a diesel. But this is normal?

[Ether-D]

I dont think any rattles are normal (lessin' it is a diesel). My old Getrag did this too. My new (junkyard) one does not.

[nando]

I dont think any rattles are normal (lessin' it is a diesel). My old Getrag did this too. My new (junkyard) one does not.

it's normal for a getrag. it'll rattle and run like that for 300,000 miles.

[bighitbiker3]

Alright sounds like Getrag rattle then...guess i'll have to get used to it

[maclogos]

I also have this rattle noise with my G260 and the noise continues even with the clutch in or out. Im starting to think bent flywheel possibly? Or even loose bolts in the trans somewhere.

[jlevie]

A rattle in neutral with the clutch engaged that disappears when the clutch is disengaged will be from wear of the transmission input shaft bearings. A lightweight flywheel will make the noise worse. Fortunately, unless really loud it isn't something to be overly concerned about. The only fix is a replacement transmission or a transmission rebuild.

But in this latest case a rattle with or without the clutch engaged is more serious. It could be from the transmission, flywheel/clutch, or the engine. Further diagnostics will be required to determine the cause.

[maclogos]

Yes i agree. I plan to pull the trans eventually to make sure that nothing is loose in there.

[maclogos]

I do know that the PO of my car was the one to sand down/grind off some of the flywheel for the M50 swap. Im thinking the quality of his work might be suspect.

[ascendotuum]

I was told by a transmission specialist that my noise was the dual-mass flywheel. He recommended swapping it for a regular flywheel.

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[nando]

if you have an M20B25 you don't have a dual mass flywheel.

[ascendotuum]

I have a m52b28 swap. Those have one?

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[nando]

it depends on what clutch you used.

also, a dual mass flywheel won't cause a rattle, unless possibly the flywheel is worn out - but you could just replace the flywheel. it doesn't have to be single mass.