308 clutch noise

You should at least check the adjustment of the pedal, and if you did replace the throwout bearing with a brand new one, it should'nt make noise but if it still make noise I'm just guessing it could be the input shaft bearing or onother bad throwout bearing.

 

Normally NO, if it is an input shaft bearing, you'll hear noise all the time. I just thought that the input shaft bearing might have the same reaction as when load or preassure is applied the noise goes away like the TOB; but as I said I'm just guessing. I am leaning toward the throwout bearing though as if you could have another bad one or a factory defect.

 

I had the EXACT same sound and pedal experience on my '77 308. The problem was the gearbox that was in need of a rebuild. All sync's and the 4th-5th gear was replaced.

 

I had the same problem after a new clutch was put in.It would make a noise only when the clutch pedal was depressed.I brought it back to the workshop and they replaced the throw out bearing.It ended up being a faulty factory throw out bearing

 

assuming your 308 is post-1980/81. If not, a low clutch pedal is very odd, since there's supposed to be a spring pulling it up against a stop unless the car has been updated.

if so, the TO bearing is always in contact with the pplate, and always spinning. I suppose putting extra load on it could shut it up, but it's not a likely problem.

use a stethoscope or long screwdriver on the top and bottom of the transfer case. There's bearings in both places. If it's the bottom bearing, it can be replaced without removing the bell housing. The top bearing I don't know. It has a seal which has to be done from inside the bellhousing, but I don't remember if the bearing itself can come out the front.

could also be xfer gear noise. If they flipped the middle gear over on reinstall, it could possibly make a different sound.

I assume the clutch change was done at a place that knew how to refill the fluids, right?

 

In general terms, if the noise goes away when you depress the clutch it's either the input shaft bearing or the input shaft gear. The input shaft spins unless the clutch is depressed, then it stops. Release bearing noises can sometimes change when he pedal is pushed, but they rarely go away.
Sorry if it's bad news,
Tom

 

the xfer case is connected to the transmission case. The way most people fill up the tranny fluid is to remove the fill plug on the side of the transmission, and pour the fluid into the fill hole on the xfer case.

when the fluid starts coming out the transmission case plug hole, you are done. You don't put anything more in the xfer case.

the ~1 cup excess fluid was spread between the two cases, so it's not a huge amount, and I wouldn't think it would matter.

have you had any more luck determining sorta where the noise is coming from?

also, does it make the noise in neutral, and does it matter if the car is moving?

 

lifting the pedal will move the release fingers away from the TO bearing carrier, which makes it easier for the clutch shaft to stop spinning and will let the TO bearing and carrier float on the shaft.

does the noise go away when you just press a little on the clutch pedal? If so, is the spring ok on the pedal (takes a bit of effort to lift it up).

could be the wrong TO bearing was installed. If I recall, the correct bearing has a face that can spin independently of the inner and outer races. If the wrong bearing is in there, the outer race/shell is one piece, and you can get a squealing kind of noise if the pressure plate hubs slips on the surface instead of spinning the bearing. When you push in the clutch, the extra pressure makes the slipping stop.

oh, I forgot you had the noise before the clutch and TO bearing was changed. Makes it less likely to be the problem.

this is assuming you have the newer clutch design. What year is your car...stick it in your profile (user controls up there in the blue bar).

does moving the stick a little bit in the shift gate make a difference, and is the shifter nicely centered in neutral?

to verify it's not the transmission or transmission input shaft, you can remove the xfer case cover and take out the middle gear. Release the clutch and spin the clutch shaft to see how it feels. Then run the car with the middle gear out (xfer case still open). You'll be able to tell if the noise is coming from the clutch shaft bearing.

 

the transmission case is deeper than the xfer case, and the connection between the two is high up on the transmission case.

A small amount of the oil would still flow out, but you'll have the car jacked up on the drivers side, so that'll tilt the oil away from the xfer case. You'd still want to take out the xfer drain plug first to keep things tidy before removing the xfer case cover, then pour back in about the same amount as came out.

I see you said the car was an '83 in a previous message, sorry about that. That means you definitely have the later clutch setup.

the spring on the clutch pedal is ok?

 

I thought is was due to an oil change issue?

Was the problem there before or a symptom after?

 

could be the issue i have and at the moment i'm running out of time and money. the TO bearing is fine so i investigated further. the large double row ball bearing that sits in the bellhousing between the top drop gear and the TO bearing needs to be replaced. this requires complete dissaseymbly and a press. not to mention the bloody bearing is north of $200. so i think for now i'll tolorate the noise and replace it next month.

i wonder how many know there is a bearing there and if it's ever been replaced?

makes a funny 'box-o-rocks' noise at idle unless the clutch is depressed. i inspected the bearing when i was checking the clutch and the gears it has some pitting which causes the noise. most likely from low oil and surface rust in it's prevouis east coast life. nothing major but needs to be replaced.

 

Hi everyone we have a 1980 Ferrari 308GTSi with a noise coming from the Gearbox when the engine is warn or after driving the car for 10 miles the noise goes away when we press on the clutch pedal. The car has a new clutch, new clutch release bearing,( TO ) crankshaft pilot bearing check all the gears for excessive play
all new input shaft bearings all carrier bearings replaced. Sounds like a rattle noise or to describe the noise for lack of better words every noise was described above has been written and described in this thread. sounds like a box of rocks tac...tac tac at idle. "I' ve read the entire post anyone post the solution to this problem ??

 

Any chance that it might have not been "updated" quite correctly (which takes work at both ends)? A "1980" would be in that time frame -- see the attached Service Bulletin 21-2. Just thought I'd mention this possibility (and can see how even ordering the right parts might get confused depending on whether updated or not updated).