Overheating

[Gransin]

OK It is actually pretty simple, remove the fan clutch housing and in the center of the clutch brake, just add a thin /thick shim where the the thermo coupling pushes against The clutch material wears and the thermo coupling as it ages doesn't push as hard as when it was new Adding the shim locks the clutch sooner and tighter I use old small cutting discs that have worn right down from a dremel I keep my old ones once they get worn down, you need something hard that will not give or break Once you get it apart , it is pretty clear where the disc goes I don't have one apart or I would add a picture for you All this works providing you don't have a completely worn out clutch but have never seen one that worn

Thanks, Rick

Rick, thanks for posting this.
Last summer we ended up locking the clutch with a bolt because we had some slight overheating problems on the e3 and we tracked it down to the clutch not engaging quite enough, or at least we had no problems after locking the clutch with a bolt.
After reading your comment we just had to try it out, and here are some pictures that might help someone else.

All the parts:

According to @eriknetherlands great info in another thread, the friction material should be somewhere near 2,7-2,8mm when new, and ours was 2,8mm.

This thermo coupling pin in the middle is what engages the clutch, here when cold:

And here after some heatgun treatment:

This pin pushes into the middle of the clutch disk, and this is where you need to add a shim.

Easiest way to check what might be the best shim thickness for you, is to put an old waterpump in the vise, and install all the parts on that.
We started with no shim, then spun the fan while heating with a heatgun to get a feeling on when, and how much it locks up.
After that I tried several different shims until I found one that does not lock up the fan when cold, but still locks it up quite fast after getting some heat.

One of the washers/shims I tried

Since it's winter, we haven't really tried it out, but it seems to lock the fan way earlier and harder.
Thanks again for the great advice, @stphers ! We wouldn't have thought about this ourselfes.

 

[stphers]

Right on You will find that it should work out quite well Have done lots over the years and it retains all the original stuff

Thanks, Rick

 

[Farzad Arjmand]

Thank you Rick very useful info.