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BrianG · 02.17.2012, 11:11 AM

I had a sound similar to that once and it was the water bump bearings. The "grinding" was the pump vanes slightly hitting something. Probably not the problem in your case though.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	02.17.2012, 11:11 AM I had a sound similar to that once and it was the water bump bearings. The "grinding" was the pump vanes slightly hitting something. Probably not the problem in your case though.