2005+ Mercury Verado 4 Stroke 200/225/250/275 6 gear housing Service Manual, Page 24Get this manual
Right Hand Rotation
3Inspect impeller bonding to impeller hub
aImpeller
4Inspect impeller for glazed or melted appearance (caused by operation without sufficient water supply)Replace impeller if any of these conditions existIMPORTANT: When completing gear housing repairs that require removal of water pump impeller, it is recommended that the impeller be replacedIf it is necessary, however, to re-use impeller, do not install in reverse to original rotation, or premature impeller failure will occurIMPORTANT: It is recommended that all seals and gaskets be replaced (as normal repair procedure) to assure effective repair