After almost 3 years of operation Eisbaer LT pump start making horrible race car engine noises. At first it works as expected. Then in about an hour the noise starts. Rpm drops to about 200-500 rpm. Some time restarting the pump helps, but only for a brief period.
About a year ago I already had to service this pump. It has seised due copper oxide buildup. Luckily it was a quick fix. I have cleaned copper oxide resedue from the impeller and reasembled the unit.
This time there the pump is fairly clean.I have cleaned small amounts of copper oxide. The impeller looks good, spins freely, there is no noticeable play on the shaft.
But the issue remains. I would be grateful for any advice.
About a year ago I already had to service this pump. It has seised due copper oxide buildup. Luckily it was a quick fix. I have cleaned copper oxide resedue from the impeller and reasembled the unit.
This time there the pump is fairly clean.I have cleaned small amounts of copper oxide. The impeller looks good, spins freely, there is no noticeable play on the shaft.
But the issue remains. I would be grateful for any advice.