Fixing an AC110

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DaveB

Fire Eel
MFK Member
Feb 22, 2008
1,244
14
68
Miami
I have two AC110s with what I assume are sand issues.

The first was brand new (bought when they were $35) and was just a backup. The first time I turned it on it made clicking noises if I opened it to full throttle. It was fine when I lowered the flow though. Over time, it started making the clicking noise every time no matter what. I tossed it in a box and forgot about it, since it was just an extra.

Today I came home from a 4 day weekend and the other one, which has been issue-free for 3 years, had stopped running and my growout tank looked like crap since the AC50 with it wasn't getting the job done. I unhooked it, cleaned it out (there was sand in the bottom), and found that the impeller was basically stuck. Pulled that out, stuck a pipe cleaner in there for a while, rinsed and cleaned the impeller, and fired it back up... it works.

But it periodically makes a sound that rivals nails on a chalkboard. Not clicking like the other one, but loud sustained noises kind of like a higher pitched version of a desk or chair being dragged across the floor.

It makes sense that in a 20g growout the intake would be close enough to to pull in some sand, so I'll have to do something about that. But is there a way to really clean that chamber out all the way? Or is it safe to lubricate it? I noticed that the impeller didn't just snap right in like the magnet usually does (I tried both in the other motor, as well as the other impeller in this) - it seemed like there was some friction. And that explains the noise. I just don't know if it's a legit and/or safe fix to rub some vaseline in there or something. I would think that'd probably fix one if not both of these, but am afraid to try it. Has anyone ever done this?

I also saw an older thread where someone said you could replace just the metal rod. Is there a place that sells just the individual pieces to these filters cheaply enough that it doesn't just make more sense to buy a new filter? I'd love to just be able to order some backup pieces. Not sure which part is to blame though - the impeller, the rod, or the motor.
 
Vaseline has worked for me. I know the squeal you are talking about on old AC110s.Take the motor off and clean it out with hot water in the sink and a bottle brush first. To get motor off if you have never done so just 1/4 turn it and pull straight away from transparent housing. After clean, coat impeller with vaseline then install. If you get too much on there you may have to spin start the motor the first time to unstick. good luck.
 
On my AC 110, the impeller shaft was worn down from ingesting sand. I pulled the shaft out of the motor with a pair of pliers and measured the length and diameter of it. Found out on another forum that I can replace the metal shaft with the ceramic one from an Eheim 2217!! I measured the 2217 shaft and the diameter is perfect but the length is too long. Installed it anyway and it is running perfectly quiet now for over 6 months.
 
The shaft is probably worn down on the loud one. I woke up today and it isn't squealing anymore, just sounds like a normal loud filter whirr. I'll try to grease it a bit and see if anything changes. If not, I can probably just swap the shaft from the other one in, since it seems OK. Seems like that one's clicking has got to be from another source, perhaps inside the motor? It's not a repetitive clicking... it's totally random.
 
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