CRX7

I have a question about this because it has been like this since i bought the car.
She has a Centerforce dual fritction and when at idle not moving with the pedal out there is a noise, high pitched and does not change with some throttle. When i put the pedal in the noise stops, help?

SpeedKing

iTrader: (4)

Sounds like a bad throwout bearing.

clayne

Transmission shaft bearings.

No it's not the pilot or the throwout.

CRX7

laymans terms, where are they and how hard to replace. Tell me inside the tranny so i can start crying

clayne

You can start crying. Input shaft to the transmission, essentially.

Sound metallic in any way? Grating, grinding, etc..

CRX7

it doesnt grind at all, just when at idle and not moving with the pedal out, when i press it in the noise goes away.

SpeedKing

iTrader: (4)

This sound is symptomatic of both a bad throwout bearing and a bad transmission. I know, I've experienced both. From your description, my guess is the former, however, if the sound is a steady "whirring", creaking kind of noise, it's your transmission. Hard to tell without being able to hear the noise. One thing I'll agree with "clayne" on though, start crying, it's not a cheap job either way.

TwinTriangles

My FC made a kind of whining noise exactly like what your talking about. It made that noise for 3 daily driven years... Turn your radio up or get louder exhaust...

ZeroBanger

Clayne is actually right this time. I took my FD in for a rebuild which I was quoted 1250. When my car was in neutral it made a sound like "Chuga chuga chuga chuga" Almost like a train. Depress the clutch, goes away. It got louder and louder. Eventually you will hear it when you are driving.

So I decided to get my tranny rebuilt, but the input shaft is a $700 part and is not part of the normal transmission rebuild. So that would have made it a $2000 rebuild, I went with a new OEM Mazda transmission instead.

Keep in mind that some noise is not abnormal. My 04 Rx-8 makes a noise similar to that, as does my new transmission I got from mazda for my RX-7. The difference is its very, very light and you really have to listen to it to know its there.

SpeedKing

iTrader: (4)

So what are you saying? He's usually wrong?

kundo

Great mine is making a grinding sound at idle and I just thought It would be the trowout bearing, but now you guys are scaring me with this trans shaft bearing thingy, this sucks!! actually sucks to be me

clayne

Throwout bearing has load on it when the clutch is disengaged (i.e. pedal IN). It's not going to make noise when the car is in neutral, clutch engaged.

Pilot bearing *could* be the cause, but it's about a 5% possibility. The other more likely 95% possibility is the bearings on the input shaft of the transmission. They are under load when the clutch is engaged (pedal out).

If you depress the clutch and you hear the sound die off almost like a rotating part slowing down (like a bearing spinning down), it's the transmission.

This is typically caused by trashed 3rd and 5th gear synchros dumping metal into the transmission oil supply.

Don't spend 2000$ on this. It will cost you at most 400-600$ for a decent used transmission without trashed synchros OR time and labor to research and do it yourself.

CRX7

sounds good, where can i get a used tranny, i can do it myself, thanks for the info. How long will she last, if thats even possible to determine. Its not very loud right now, and sometimes is bearly noticable.

ZeroBanger

just becareful, you will have no idea if syncros are bad or the tranny you buy doesn't have problems.

rzograbian

i have that too. its the throwout bearing on mine.

clayne

Until you take out the throw out bearing, that's a shot in the dark.

The throw out bearing doesn't have load on it when the clutch is engaged.

Ripzta

Mine has that noise when the clutch is out in neutral. When the clutch is in the noise slows down then you cant hear that spinning metal sound. That was in NEUTRAL. In ANY gear even with the clutch in or out it still makes that noise.

As I said it only stops when in neutral with clutch engaged(in). I always thought it was a throw out bearing too! But damn could be worse huh!

So what parts will i need to stops this?? Should i just rebuild the tranny or get a second hand one??

One more question. Will this problem get worse if I don't fix it soon??

Ripzta

Sorry. In ANY gear (when the car's moving) even with the clutch in or out it still makes that noise

ZeroBanger

read my post above. Eventually my input shaft went bad. It started out with just the noise in neutral. it got worse over the next few months. eventually, I heared it while driving in any gear.

my pilot bearing was bad. Had I got it fixed early it could have just been a rebuilt. since I waited the input shaft was eaten. Thats a $700 part alone.

I went with a new OEM transmission.

Ripzta

how much was the new tranny??
did you buy it from a mazda dealer??
so its better to replace it then rebuild it?

ZeroBanger

The going price to do a rebuild is 1500. Since my input shaft was bad that is an extra $700 + what ever labor to make it 2300. A new tranny was 2300 + 350 for install.

I got it from Malloy mazda. List price is 2600, he sold to me for 2200 +100 for shipping.

scotty R

iTrader: (13)

just saw this thread and it got me thinking ,
i purchased a used transmission for my manual swap. it had less than 90xxxkm but sat dry and unused for over a year. i used brand new OEM mazda parts , to go along with the used transmission, new pilot bearing and seal, new throw out bearing , fork sprung back and worked fine, new collar and ring as well. used parts were the transmission clutch and pressure plate.

if you match the cars speed and revs while going down the highway the sound goes away. the rest of the time its almost like a metal scraping sounds but very light sounding , im pretty sure its just when the car is in gear under load , while in neutral its doesnt make the sound.

from reading this thread im assuming its my imput shaft? or could it just be some bad syncro or a gear that just needs rebuilding. also prior to driving i put fresh synthetic lucas oil in it and when finally driving not one gear grinds or slips.

any suggestions would be great
thanks

Tem120

iTrader: (5)

I have a similar issue , my engine is currently out I wanted to know if there was any visual queues that may lead me to see if the input shaft is bad? or any kind of test I can do to see if its bad , as my pilot bearing was bad as well

nealcam

iTrader: (1)

easiest way is to basically grab the input shaft and give it a good shake to see what kind of play it has... my old tranny was obviously bad compared to the new one i put in.... also spinning the input shaft made a lot more noise comparing to the new as well. the new one still made noise so dont go by this alone.

hope this is somewhat helpfull

joelkarlonas

My trans is making a fair bit of noise. When I press in the clutch at idle it shuts right up. And she wines in gear till about 3k rpm when I can't hear over the engine. I can put a video on my build thread if that helps.