Quicksilver water pump impeller washer is a genuine plastic washer that acts as a spacer around the impeller in the water pump on compatible Mercury and Mariner outboard motors. The washer is part of the gear housing water pump assembly and contributes to the specified spacing and sealing around the impeller.
The spare part fits documented 2-stroke and 4-stroke models from 30 to 60 hp, including selected Carb, EFI, Jet, SeaPro, and Formula 60 models. Compatibility depends on the specific engine variant, so the engine's serial number and the part number should always be verified before ordering.
Part number 12-8M0005777 replaces the previous numbers 12-858234 and 858234. The part has subsequently been superseded by 12-8M0204720, which may look different from the previous version.
The washer is sold individually. Two washers are used in the relevant water pump assemblies, so the required quantity should be checked during service or replacement.
Key featuresGenuine Quicksilver spare part
Part number: 12-8M0005777
For water pump impeller in the outboard gear housing
Material: Plastic
Sold individually
Two washers are used in relevant water pump assemblies
Compatible with documented Mercury and Mariner models
Superseded by 12-8M0204720
Always check the engine's serial number and part number before purchase
