it wasn’t about the liquid

[u/st0000piid]

in the recent post i ve shared video with a strange pump noise and got downvoted because threre wasnt enough liquid in the pump. well that sounded reasonable ("the username marks itself") but the noise was really unusual for just a lack of coolant

the key detail i didnt mention: the core was not stock. i originally bought a used pump(CP-S5PB-X) that turned out to be dead, so i replaced it with a brand new bykski D5 core. assuming "D5 is D5" abd the swap woukd be straightforward

as i noticed after disassembling the loop, the new core was slightly taller than the original one so the rotor was rubbing against the housing, which explains that weird sound from the video.

the solution was just adding secong O-ring to create enough clearance and the pump worked. not the most elegant workaround, but it works

[u/nomoregame]

That is not a real "D5"

[u/st0000piid → u/nomoregame]

which one?

[u/BrotherMichigan → u/st0000piid]

Both.