transmission or clutch chatter

[JayDog]

OK everyone my dilemma is this,I replaced the
clutch with a heavier duty clutch and also flywheel , pilot bearing,didn't change the throwout bearing or slave cyl.I had a chatter either in the transmission or clutch prior to the new installation ,when I replaced the clutch ,flywheel and so on.I would say 3 weeks ago the chatter is still there except when I press down the pedal,when the pedal is released the chatter resumes,could anyone tell me what this may be or put me in the direction to go.its a 94 ranger 2.3 mild lift with 33's 5 speed,thank u for all who may help

 

[Mikel89us]

Sounds like a throw out bearing.

 

[tomw]

The throw out bearing won't cause chatter, as it is the grab-release-grab-release of the clutch that causes chatter. The bearing should not be moving the clutch plate 'fingers' to cause the clutch to apply-release-apply. If someone can explain how that is possible, I'd really like to hear how.
Chatter can be caused by worn out or broken motor mounts. The clutch grabs, the torque is beginning to be applied, and the engine & transmission rock in one direction as the mount lets them move.
If the disc has been oiled or contaminated with brake fluid, you can also get chatter. If the pressure plate is not fastened properly, it can grab intermittently and rock around on the flywheel.
If the pressure plate has not been resurfaced at the installation of the new disc, it can cause chatter due to the 'heat checking' or to a non-flat surface.
tom

 

[Mikel89us]

If its just a chattering noise, yes the throw out could cause it, if its always in contact with the plate springs. And if its while driving a driveline chatter is most likely caused by the clutch slipping.

Please specify, noise or feel.

 

[gw33gp]

I am guessing you have the Mazda transmission. The throw out bearing rides on a guide to keep it in place. The inside of the throw out bearing that rides on this guide has many plastic vanes that contact the guide to allow contact but keep the pressure low so it does not drag. These vanes can wear or permanently deflect and cause a lot of clearance between the throw out bearing and guide. This can cause chatter or a kind of screeching sound depending on the frequency of the vibration.

I experienced this on my Ranger. It would only make the sound when the clutch was just starting to engage. I can see where you could get the chatter you are getting from the same kind of wear. When you push in on the clutch, the TO bearing is firmly in contact with the diaphragm of the pressure plate. This could help to stabilize the TO bearing. When the clutch is out the TO bearing is in light contact with the pressure plate and could cause instability and resulting chatter noise.

I really don't know for sure if your TO bearing is the same as mine but I imagine all the Mazda M50D type transmissions have a similar design.

I modified the design of the inside vane area of the new TO bearing in an attempt to get more life out of it. The vanes are on an angle to the contact surface with open spaces behind it. I used RTV silicone to partially fill that area to act as a flexible support. That still allows flex but resists permanent deformation.

When I applied the silicone, I smoothed the interior and let it cure for 15-20 minutes to form a skin. I also put a thin PTFE (Teflon) coating on the metal guide around the input shaft. I didn't want the silicone to bond to the metal guide. I then slid the TO bearing on the guide and let the silicone completely cure overnight. I then slid it back and forth to make sure it had not bonded. I have about 80K miles on I now and it is still working perfectly. I can't say the silicone solved my problem but I can say it didn't have any adverse effects.

Good luck in finding your problem.

 

[Mark_88]

I had some noise sounding like a screeching and or chattering...I thought it was the clutch as it only seemed to happen when I put the clutch in...well...

Driving to my sister's place after the noise first started to appear ended up with me on the side of the road...the cause...the passenger side front bearing had collapsed and the noise I heard was the beginning of things rapidly going south...the wheel eventually slipped down and sheered the spindle nut off...by the time I stopped all that was holding the wheel on the shaft was...the brake line...

So...just give your wheels a quick once over to make sure they are not loose and ready to fly off...especially the front two...as they are held on, essentially, by that one little nut...