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DrKnow

RC Newbie
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Location
Ohio
RC Driving Style
  1. Bashing
  2. Racing
After running today, I noticed that the clutch bell had become over-heated, causing the back end (the end that covers the clutch) to turn a burned color. I have taken the clutch bell and clutch off the motor and they seem fine, a little burned, but okay and there was a small amount of clutch dust too. Nothing was gouged or out of shape and the clutch is intact with the spring still attached. I am wondering what caused this to become over-heated. :angry:

What can be done to prevent this again?
 
DrKnow said:
After running today, I noticed that the clutch bell had become over-heated, causing the back end (the end that covers the clutch) to turn a burned color. I have taken the clutch bell and clutch off the motor and they seem fine, a little burned, but okay and there was a small amount of clutch dust too. Nothing was gouged or out of shape and the clutch is intact with the spring still attached. I am wondering what caused this to become over-heated. :angry:

What can be done to prevent this again?
Click to expand...

You may have had the shoes in backwords, or the were slipping from being worn too much.
 
be careful with a heated CB....they can get a high temp "glaze" effect on the metal and just let the clutch shoes slide more than usual...then the sheos become glazed and your whole setp is crap....the engine revs higher to maintain speed with less load on it and they can blow or at elast do long term damage and extra unnessesary wear as well..
 
A few reasons your clutch could get over-heated are from something binding in the driveline, lots of hard acceleration back to back or a tight gear mesh.
 
Maintenance is about the only thing you can do to help prevent it. Take the CB off at least once a gallon (really more often would help) and clean it with DA to remove any oil buildup. Then sand the contact area of the bell with mild sandpaper to rough it up again. Also, clean the shoes with DA really well, install, then rough up the contact area on the shoes as well.

Over gearing, oil and too high of expectations are what causes clutches to fail. Running taller gearing than you have the environment or engine for will cause the clutch to slip no matter what. A drop of oil will cause the clutch to slip no matter what. Too weak of an engine to pull the gearing your running (or environment your running in) will make it run at a lower RPM and not fully engage the clutch.

Once a clutch is glazed (shiny), it will slip and slip worse as time goes on.

Bearings leak oil as they get warm and as time wears the seals. So your CB bearings fling oil into the CB which is why periodic maintenance is required.

Gearing too tall for your environment/setup will also cause it to slip and glaze no matter what. If you run on pavement, you can gear taller due to less rolling resistance. If you run smaller/lighter tires, same thing. Running in grass or large tires means you should gear down a bit so the clutch can fully engage earlier (in mph) instead of slip until the truck catches up in momentum.
 

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