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Fine Metal Shavings In Gearbox Oil

Dani Boi

By Dani Boi,
in Western Australia

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Dani Boi Grand Master

Dani Boi

Posted
Posted

Just got a new clutch installed on my car and the workshop also changed the gearbox oil. They found some very fine metal fillings around the plug area and floating in the gearbox oil. He wrapped the filings up in paper so I could have a look, and yeah if i rub it between my fingers it's definately there...

I know it's not good, what should I do? :) Any quick checks I can do before I drive it off a cliff :)

On another note there's some sort of noticeable spinning noise coming from the passenger floor. Could a machined flywheel cause that or is it just the clutch bedding in etc?

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https://www.sau.com.au/forums/topic/270055-fine-metal-shavings-in-gearbox-oil/
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mitchy_ Grand Master

mitchy_

Posted
Posted
The noise should go away when the clutch is engaged, if so it's pretty normal.

rofl, who told you that?

when does it make the noise, clutch engaged/disengaged? f**ked bearings will make a noise, could be the throwout bearing (was this replaced with the clutch?) or even the input shaft bearing.

the only noise a box should make is the rattle when a multi plate clutch is disengaged, or straight cut gears.

reNEGaDe88 Proficient

reNEGaDe88

Posted
Posted

Sounds like gearbox shaft bearing to me. Does it get noisy in gears like 3rd or 5th? My R31 did that. I broke some teeth off 3rd gear, and then it was noisy in 3rd and 5th. Got worse and louder as I went on. Fillings can get stuck in ur bearings or just wear it out real quick. Best to completely flush ur gearbox and baby it. Use redline lightweight shock proof oil to ease the situation, buts its bad. Save up cash for a new 33 box.

Hanif85 Apprentice

Hanif85

Posted
Posted

I agree, sounds like bearings, don't be too worried, but it probably is time to start saving for a box!

Had the same problem in my s14 (filings) and from memory my mechanic used a different box oil to prolong its life.

Dani Boi Grand Master

Dani Boi

Posted
  • Author
Posted
when does it make the noise, clutch engaged/disengaged? f**ked bearings will make a noise, could be the throwout bearing (was this replaced with the clutch?) or even the input shaft bearing.

the only noise a box should make is the rattle when a multi plate clutch is disengaged, or straight cut gears.

The noise only happens when im driving normally, if the clutch is pressed the noise will disappear, but as soon as I release the clutch it comes back. I dont know if it'll be a huge problem (its not clunking or extremely loud) as its only just happened as soon as I got the clutch installed. But the kit I had replaced the clutch, pressure plate and release bearing. It might be "wearing in" sort of speak, I think I might leave it for a week or so. I was more worried about the metal in my gearbox oil :(

But yeah everything feels right with the car and I have crunched my gears once or twice since owning, cant believe I didn't think of that :P

Douse Collaborator

Douse

Posted
Posted

My car does that too.

Because it doesn't do it when the clutch is pushed in, it means it is not the thrust bearing but the gearbox bearings.

Wouldn't worry about it until something breaks. My gearbox has made that sound for the last 1.5 years and hasn't gotten better or worse, even after changing the oil. I have been to advanced driver trainings and drags and its still all good.

I am still expecting it to break with the extra power being put through the crappy RB20 gearbox, but it keeps on trucking :P

As for the metal shavings, I had those too when i changed the oil. Thats what the magnet on the gearbox sump plug is for :(

reNEGaDe88 Proficient

reNEGaDe88

Posted
Posted

Yeah, its bearings. When the gearbox is spinning in gear or in neutral when the flywheel and clutch are in contact it will make that noise. So its not the thrust bearing as said b4.

My R31 did that cos I double the power output of the engine on a 20 year old box. My bearing noises got worse and worse until the box broke.

ossie_21 Grand Master

ossie_21

Posted
Posted
rofl, who told you that?

when does it make the noise, clutch engaged/disengaged? f**ked bearings will make a noise, could be the throwout bearing (was this replaced with the clutch?) or even the input shaft bearing.

the only noise a box should make is the rattle when a multi plate clutch is disengaged, or straight cut gears.

You can pick yourself up off the floor if that's possible, mis-spelling one word isn't the end of the world. :P But thanks for making the effort.

It's exactly as I meant, you can hear the bearing when the clutch is engaged (easy to hear at idle), but when you dis-engage it goes away. It's a normal thing with most aftermarket clutches & naturally it seems odd the first time you hear it after you knew what the previous clutch sounded like.

ossie_21 Grand Master

ossie_21

Posted
Posted

Oh and because you say it's quite noticeable on the passenger side it could be the box, but weird if it's only noticeable after an oil change. The clutch bearing sound generally seems to be coming from right under your feet, not on the other side....

mitchy_ Grand Master

mitchy_

Posted
Posted
You can pick yourself up off the floor if that's possible, mis-spelling one word isn't the end of the world. :P But thanks for making the effort.

It's exactly as I meant, you can hear the bearing when the clutch is engaged (easy to hear at idle), but when you dis-engage it goes away. It's a normal thing with most aftermarket clutches & naturally it seems odd the first time you hear it after you knew what the previous clutch sounded like.

what did you mis-spell?

either way, there shouldn't be any noises... i've had a stock clutch, os giken super single, exedy single, and now a custom built single plate, not one has made a noise.

Douse Collaborator

Douse

Posted
Posted
You can pick yourself up off the floor if that's possible, mis-spelling one word isn't the end of the world. :) But thanks for making the effort.

It's exactly as I meant, you can hear the bearing when the clutch is engaged (easy to hear at idle), but when you dis-engage it goes away. It's a normal thing with most aftermarket clutches & naturally it seems odd the first time you hear it after you knew what the previous clutch sounded like.

Hold on hold on hold on....

He said the noise disappears when the clutch in engaged, so it is not the thrust bearing. As the thrust bearing is working while the clutch is engaged...

And i would have thought you shouldn't be able to hear a brand new thrust bearing?!?

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