So I am trying to make a alternator and I am using 3 water wheels and and it keeps saying overstressed but when i add a 4th one it breaks

[thrashervr10]

I am using 1.16.5 and I have all the mechanical crafter (21) and with 3 water wheels it says over stressed and i build a forth water wheel and when i connect it to the mechanical crafter it breaks the mechanical crafter that i am trying to connect the 4th water wheel to and yes they all have soil sand and everything it just will not let me add a fourth water wheel and they are all in different spots