Tat2d Posted August 30, 2011 Share Posted August 30, 2011 After firing up my system last night, I went back a couple of hours later to check on everything and found my Iwaki return pump was so hot I could not touch it for more than 5 or 6 seconds. I'm guessing that's not right. Pump runs very quiet and seems like it's working fine otherwise, but I'm pretty sure you could cook an egg on it. I shut down the pump and put powerheads and heaters in the sump and display to keep all the rock happy while I try to figure this out. Any ideas? Link to comment Share on other sites More sharing options...
sergebmw3 Posted August 30, 2011 Share Posted August 30, 2011 Is it a new pump or used ? Could be that ur over loading the pump if u have a gate valve on the output side. If u font maybe it's the barring going out but that would be a downer. Does it make any noise when running? Another thing could be power starvation, because oddly enough lack of watts causes things to overheat. I hope u figure it out soon --- I am here: http://maps.google.com/maps?ll=45.730137,-122.635266 Link to comment Share on other sites More sharing options...
pnkrcklives Posted August 30, 2011 Share Posted August 30, 2011 I agree with serge. What kinda head pressure you putting on the pump? Try testing the temp with a infared thermometer. Then if you can let it cool(below the temp it was). Run it wide open with the shortest tube with no rise(ie short rubber hose back into the sump) test the temp again. If they are drastically different you may have found your problem. If no change I would suspect a bad bearing or worn part internally. Hope that helps. Link to comment Share on other sites More sharing options...
wegotjs Posted August 30, 2011 Share Posted August 30, 2011 I had a little giant that ran so hot that you could not touch it.It ran for 5 years. Link to comment Share on other sites More sharing options...
markvo Posted August 30, 2011 Share Posted August 30, 2011 I have a new Iwaki 100 that runs very hot. I expect it to run that way for years. Link to comment Share on other sites More sharing options...
Tat2d Posted August 30, 2011 Author Share Posted August 30, 2011 I'm just super paranoid, I guess. Went and got a Mag 9.5 and just got it hooked up. Problem solved. Thanks for the suggestions. Link to comment Share on other sites More sharing options...
pnkrcklives Posted August 30, 2011 Share Posted August 30, 2011 So what you gonna do with the Iwaki?? What are the model numbers? I might be Interested in it! Link to comment Share on other sites More sharing options...
Electrokate Posted August 30, 2011 Share Posted August 30, 2011 I have an Iwaki for parts for free, it makes screaming noises. Tried to take the cover off to clean the fan (likely source of noise) but the screws were too rusty and dissolved. It's a MD 40RT. On the off chance yours is the same model, perhaps someone can combine the parts. Kate Link to comment Share on other sites More sharing options...
Tat2d Posted August 31, 2011 Author Share Posted August 31, 2011 It's an MD20RXT. It ran very smooth and quiet, just got as hot as an engine block on a car. I don't think I was restricting it too much, just a standard AGA 3/4" return with flexible tubing in between. I took it apart to check, clean, and re-orient the output before installing it and it looked brand new inside. I made arrangements to return it and get my $50 back already. Link to comment Share on other sites More sharing options...
pnkrcklives Posted August 31, 2011 Share Posted August 31, 2011 Sweet I am just looking to try my hand a repairing some of these pumps and letting people use them as backups in case of emergency. Electrokate I will take yours of your hands try and repair it and if you need it or want it for a backup you can have it back. Or I will pass it along to someone in need. Figured it maybe a good way to return all the favors I have recieved from other members. Link to comment Share on other sites More sharing options...
Electrokate Posted August 31, 2011 Share Posted August 31, 2011 That is a great offer... you are welcome to it. Might be a fun experiment but it might also be done for as it's pretty old. Suspect the noise was from the fan having sucked in my hair, caught it doing that once. But it could be damage to the impeller or the motor itself. It never ran too hot, but definitely warm. I switched it with a Mag 12 which actually is too much for my sump, got microbubbles everywhere. It's always something. Not sure if an Iwaki 40 ought to be pushing less flow than a mag 12 on the same plumbing. Kate Link to comment Share on other sites More sharing options...
Bicyclebill Posted August 31, 2011 Share Posted August 31, 2011 It's an air cooled electric motor. It's simply transferring heat to the air rather than into the water like the Mag is. Just make sure the fan at the end of the shaft is all together and isn't being restricted. Link to comment Share on other sites More sharing options...
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