[Jake Raby]

If you have missing impeller blades and they were not found during the flush, then you still have missing impeller blades- they do not disappear.

When the blades become lodged into capillaries within the head is when we see issues and it takes more than water pressure to remove them as heat and engine vibration helped to get them there.

This is why changing the pump electively before any failure is experienced is so beneficial. That means changing the pump every 3 years, no matter the mileage.

If you have missing impeller blades the only way to remove them may be while the head is on our milling machine having a crack repaired.. Digging these out during crack repairs is common practice, its what taught us the true reason for most unexplained head cracks from engines that never had overheated.