When reconditioning a coolant pump, what critical specification effects pumping efficiency.
A) Impeller blade thickness.
B) Amount of allowed scale buildup on the impeller.
C) Impeller-to-housing clearance.
D) Impeller shaft wear.

Question

Quizplus · Accepted Answer

Impeller-to-housing clearance is a critical specification that affects pumping efficiency in a coolant pump. If the clearance is too small, it can cause the impeller to rub against the housing, causing damage and reducing efficiency. If the clearance is too large, it can cause recirculation and reduce flow rate. The other options (A, B, and D) may also have an effect on efficiency but are not as critical as impeller-to-housing clearance.

When Reconditioning a Coolant Pump, What Critical Specification Effects Pumping