Help please... Input shaft bearings or?

[guest7581]

I have a 2004 Honda Jazz 1.4. There is a loud oscillating sound when i let out the clutch through the gears. When the clutch pedal is pressed down, no sound.
There seems to be mixed thoughts on this... throw out bearing vs. input shaft bearing vs. whatever else. I've ruled out wheel bearing noise because its quiet while coasting. It appears to make this noise only while accelerating, because when i let off the gas while moving, the noise dissipates. I will be fixing this myself and want to start troubleshooting in the right place... obviously.

Any insight would be helpful and appreciated. I have included a video URL below to see and hear how the action and sound.

TIA... Ken

https://www.dropbox.com/s/ysjaxx6v3enkhb6/Honda%20Noise.mp4?dl=0

[guest7024]

I have a 2004 Honda Jazz 1.4. There is a loud oscillating sound when i let out the clutch through the gears. When the clutch pedal is pressed down, no sound.
There seems to be mixed thoughts on this... throw out bearing vs. input shaft bearing vs. whatever else. I've ruled out wheel bearing noise because its quiet while coasting. It appears to make this noise only while accelerating, because when i let off the gas while moving, the noise dissipates. I will be fixing this myself and want to start troubleshooting in the right place... obviously.

Any insight would be helpful and appreciated. I have included a video URL below to see and hear how the action and sound.

TIA... Ken

https://www.dropbox.com/s/ysjaxx6v3enkhb6/Honda%20Noise.mp4?dl=0

That would suggest clutch bearing 

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[guest7581]

Are you saying the clutch release bearing?

[guest7581]

Are you saying the clutch release bearing?

I thought that was more of a squeal... no?

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[sparky Paul]

Release bearing makes noise when you push the clutch down - foot off the clutch, there would be no noise.

If it goes quiet when you de-clutch, i.e push the pedal down, then the problem is in the gearbox. If the noise occurs in and out of gear with the clutch up, probably input shaft bearings.

[guest7581]

Release bearing makes noise when you push the clutch down - foot off the clutch, there would be no noise.

If it goes quiet when you de-clutch, i.e push the pedal down, then the problem is in the gearbox. If the noise occurs in and out of gear with the clutch up, probably input shaft bearings.

Would you check anything else (gearbox oil, tranny oil) before tearing into the transmission?

Or is this definitely the input shaft bearing?

Easiest first right?

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[John Ratsey]

This recent gearbox discussion might be relevant https://clubjazz.org/forum/index.php?topic=9811.0.

[guest7581]

So... it sounds like you can replace the following without removing the gearbox or bell housing from the car... is that right? I've never worked on a Jazz before.

-Differential / Crown wheel bearings
-Laygear / Input shaft bearings
-Diff pinion / Mainshaft bearings
-Oil Seals

[olduser1]

Your best bet is to look up the fault on the US site - fitfreak.net

[guest7581]

Your best bet is to look up the fault on the US site - fitfreak.net

I posted there... no help

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[sparky Paul]

Usual method is to remove the gearbox from the car and split on the bench, but the company Jocko used in the other thread appears to split the gearbox in situ. I was a bit sceptical, but he was delighted with the results.

On the strength of that, I would probably have a go at the same idea if I was sure the clutch was good. If the clutch hadn't been touched for a long time, you may as well take the gearbox off and do the clutch at the same time.

[guest7581]

Usual method is to remove the gearbox from the car and split on the bench, but the company Jocko used in the other thread appears to split the gearbox in situ. I was a bit sceptical, but he was delighted with the results.

On the strength of that, I would probably have a go at the same idea if I was sure the clutch was good. If the clutch hadn't been touched for a long time, you may as well take the gearbox off and do the clutch at the same time.

Quick question:

I jacked the front end up and ran through the gears (wheels spinning). No sound... wtf? Any thoughts? Apparently, whatever is making that noise only makes it when the weight or resistance of the car is there.

Again... when driving (moving) and I put it in neutral... no sound, that's why I ruled out wheel bearings. When I Jack the car up and engage gears, no sound... what do these symptoms point to?

TIA



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[sparky Paul]

Bad bearings will be quieter when they are not under load.

When you apply resistance to the drive, i.e propelling the car, the shafts in the gearbox are forced apart slightly as the drive is transferred from shaft to shaft via the gears. This forces the ball bearings harder into the races on the outer side, and it's the bearing races which are damaged and cause the noise.

Does that make sense?

[guest7581]

Bad bearings will be quieter when they are not under load.

When you apply resistance to the drive, i.e propelling the car, the shafts in the gearbox are forced apart slightly as the drive is transferred from shaft to shaft via the gears. This forces the ball bearings harder into the races on the outer side, and it's the bearing races which are damaged and cause the noise.

Does that make sense?

So... input shaft bearing then?

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[guest7581]

Bad bearings will be quieter when they are not under load.

When you apply resistance to the drive, i.e propelling the car, the shafts in the gearbox are forced apart slightly as the drive is transferred from shaft to shaft via the gears. This forces the ball bearings harder into the races on the outer side, and it's the bearing races which are damaged and cause the noise.

Does that make sense?

So... input shaft bearing then?

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Any yes... that makes sense.

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