Rubbing or Rattling sound

All you did was change from 1 trans to another?

Issue isn't the clutch.

No way would I be stabbing the motor again, I would be taking the trans to Weddle.

 
Looks like it's time for me to jump in.

  • There is a "rattle" type noise, emanating from the bell housing area, when the clutch is engaged (clutch pedal up).


    Best to get a video/sound clip of the noise if possible. E-mail to me directly at Sean@weddleindustries.com

[*]Noise goes away when clutch pedal is depressed. 


  • This could mean that the noise would be in the transaxle, but not in every instance. There could still be an issue with the clutch.

[*]The problem seems to get worse as the trans warms up.


  • This is common as housings expand and tight fitments loosen, and oil starts to thin out allowing for more movement of parts inside.

[*]Clutch components appear to be in good condition with visual inspection. 


  • Verify that the clutch discs are installed correctly. The "snout" of the hubs in the discs should be placed towards the transaxle. It's not uncommon for these to be installed backwards, this is more common than you think.



If you have verified that the clutch is certainly not the problem, then you would need to contact the shop/builder of the trans and speak with them about bringing it back to them for inspection. If there is a faulty part in the transaxle, the builder/shop will work with us to resolve the issue. 

For what it's worth, there really are no bearings in the transaxle that will "rattle". They should all have preload on them when assembled. If anything, a bad bearing is going to whine, and will change pitch with engine RPM or wheel speed depending on what shaft it is supporting. 

Is this a 5-speed? There have been maybe 2-3 S5 units over the past 10 years that have some sort of mystery rattle (CJ/Mark Hutchins prerunner, and Kevin Price Class 10 car). It would rattle really bad on start up and shut down, but not while driving the car. I spent more time than I care to admit trying to find where that noise came from, but could not replicate it here on the bench. The only thing that we could try and point to was some sort of un-balance somewhere in the engine, clutch, or even a gear in the trans that would vibrate/rattle at those specific frequencies. It's been a few years, but I think after changing complete clutch assemblies and a bunch of parts in the trans, the noise finally went away, but it was never pin-pointed. 

 
Last edited by a moderator:
Sean@Weddle said:
Looks like it's time for me to jump in.

  • There is a "rattle" type noise, emanating from the bell housing area, when the clutch is engaged (clutch pedal up).


    Best to get a video/sound clip of the noise if possible. E-mail to me directly at Sean@weddleindustries.com

[*]Noise goes away when clutch pedal is depressed. 


  • This could mean that the noise would be in the transaxle, but not in every instance. There could still be an issue with the clutch.

[*]The problem seems to get worse as the trans warms up.


  • This is common as housings expand and tight fitments loosen, and oil starts to thin out allowing for more movement of parts inside.

[*]Clutch components appear to be in good condition with visual inspection. 


  • Verify that the clutch discs are installed correctly. The "snout" of the hubs in the discs should be placed towards the transaxle. It's not uncommon for these to be installed backwards, this is more common than you think.



If you have verified that the clutch is certainly not the problem, then you would need to contact the shop/builder of the trans and speak with them about bringing it back to them for inspection. If there is a faulty part in the transaxle, the builder/shop will work with us to resolve the issue. 

For what it's worth, there really are no bearings in the transaxle that will "rattle". They should all have preload on them when assembled. If anything, a bad bearing is going to whine, and will change pitch with engine RPM or wheel speed depending on what shaft it is supporting. 

Is this a 5-speed? There have been maybe 2-3 S5 units over the past 10 years that have some sort of mystery rattle (CJ/Mark Hutchins prerunner, and Kevin Price Class 10 car). It would rattle really bad on start up and shut down, but not while driving the car. I spent more time than I care to admit trying to find where that noise came from, but could not replicate it here on the bench. The only thing that we could try and point to was some sort of un-balance somewhere in the engine, clutch, or even a gear in the trans that would vibrate/rattle at those specific frequencies. It's been a few years, but I think after changing complete clutch assemblies and a bunch of parts in the trans, the noise finally went away, but it was never pin-pointed. 
Click to expand...
Sean, Thank you for your input.

The is a new S45 I purchased in December of 2019, I never installed it due to some health problems, We just installed it a month ago, It has 0 time on it. We did not touch the clutch because it was working fine and the engine was fresh with 2 days in Glamis. This noise was not present prior to the installation. It is a rubbing type noise and sometimes a few slight rattle noises. Sometimes when I start the engine, it takes a minute before the noise starts, other times it is present as soon as the engine starts. I already removed the clutch so I can not do a video, I could not find any issues with the current clutch, but to rule out something I'm not seeing, I ordered a new clutch assembly and flywheel from you guys and should have it tomorrow.  I should have the new clutch installed this weekend and we will see (or hear) if that resolves it. 

I will post my results!

 
Would incorrect fluid cause this? I had a BMW that made gear rattle type noises when the clutch was out if you didn’t use their specific oil.

 
Starter motor bendix is not releasing fully or starter clearance issue??

 
Sandkist said:
Starter motor bendix is not releasing fully or starter clearance issue??
Click to expand...
That was the first thing I checked, I actually started the engine and carefully loosened the starter. Then realized the noise stopped when I pushed the clutch pedal down.

 
Excessive crankshaft end play? When you push in the clutch it will move the crankshaft/ flywheel. 

 
Sandkist said:
Excessive crankshaft end play? When you push in the clutch it will move the crankshaft/ flywheel. 
Click to expand...
I have had multiple conversations with engine builders over the years that have said they have seen excess thrust bearing wear/damage from heavily sprung clutch pressure plates (stage 4, Tilton, etc.), as well as torque converters with high pressures have caused similar issues. 

 
Sean@Weddle said:
I have had multiple conversations with engine builders over the years that have said they have seen excess thrust bearing wear/damage from heavily sprung clutch pressure plates (stage 4, Tilton, etc.), as well as torque converters with high pressures have caused similar issues. 
Click to expand...
I just checked that. .002"

 
Sean@Weddle said:
I have had multiple conversations with engine builders over the years that have said they have seen excess thrust bearing wear/damage from heavily sprung clutch pressure plates (stage 4, Tilton, etc.), as well as torque converters with high pressures have caused similar issues. 
Click to expand...
On a SBC or BBC and a older ford motor,  but not very common on LS based engine.  Stock motors as a hardened Aluminum bearing for the thrust, so even harder to wear out the thrust, Mahle or a ACL are a little softer but have more oiling slots, so they lubricate better,  

 
I replaced the entire clutch assembly including flywheel.

The ugly sound is still present, it goes away when the clutch pedal is pushed down. Trans has 0 miles on it! Yes, it has gear oil.



Video Sound.mp4
 

Attachments

Does it change with just a slight amount of pressure on clutch pedal?

 
Appears as though you have tried everything but did you remove the slave cylinder and let the throw out bearing arm retract fully?

 
Growler58 said:
No, I have to completely disengage the clutch.
Click to expand...
Correct. But is the t/o bearing making a small amount of contact when disengaged? The thought I had was will the noise go away or change with just a slight amount of pressure on pedal.

 
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