Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 412Get this manual
3Remove the impeller, impeller key, the face plate and gaskets, (discard the gaskets) 3Inspect for proper bonding between the hub and the impellerReplace the impeller if improper bonding is foundc:::70605
aImpellerImpeller KeyWater Pump Face Plate and Gaskets (One on each side of the face plate)
aImpellerHub
WATER PUMP ASSEMBLYCOMPONENT INSPECTION
1Inspect the water tube coupling assembly for wear or damageIf necessary, replace the worn or damaged components especially the two 0rings on the inside, one at the top and one at the bottom
4Inspect the impeller blades to see if they are cracked, burnt, hard or deformedReplace the impeller if the blades are in this condition