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SCompRacer · 06-10-2003, 10:32 AM

I've got experience with two MCP300's. The first one I had was quiet and was sold with a system. The second one was noisy from the first time I powered it up.

The first thing I notice when I took it apart was the impeller hitting an hour of production clock cast into the face of the pump so I sanded the hour marks off. I also notice the impeller is not centered in the bore of the pump housing so the impeller can still strike the face of the pump on one side if the magnet floats into the pump housing. So I straighten the fixed metal shaft that the impeller rides on and slide a thin nylon washer on the metal shaft as a shim so the impeller cannot get drawn all the way into the pump housing. I found the impeller is not fixed to the shaft so I super glued it. I also put some grease on the impeller shaft. Nice and quiet for near a week of 24/7 use till the grease washes out.

06-10-2003, 10:32 AM	#10
SCompRacer Cooling Neophyte Join Date: Apr 2002 Location: Illinois Posts: 94	I've got experience with two MCP300's. The first one I had was quiet and was sold with a system. The second one was noisy from the first time I powered it up. The first thing I notice when I took it apart was the impeller hitting an hour of production clock cast into the face of the pump so I sanded the hour marks off. I also notice the impeller is not centered in the bore of the pump housing so the impeller can still strike the face of the pump on one side if the magnet floats into the pump housing. So I straighten the fixed metal shaft that the impeller rides on and slide a thin nylon washer on the metal shaft as a shim so the impeller cannot get drawn all the way into the pump housing. I found the impeller is not fixed to the shaft so I super glued it. I also put some grease on the impeller shaft. Nice and quiet for near a week of 24/7 use till the grease washes out.