Water Pump: Inspection

WARNING: This page is about a different variant/trim than selected.

Check the water pump bearing for smooth rotation.
Check the water pump pulley for abnormalities.
Make sure the impeller is not abnormally deformed or damaged.
Inspect the clearance between impeller and pump case.
Clearance between impeller and pump case:

Standard

0.5 - 1.5 mm (0.020 - 0.059 in)

Courtesy of SUBARU OF AMERICA, INC.
After water pump installation, check pulley shaft for engine coolant leaks or noise. If leaks or noise are noted, replace the water pump assembly.