This water pump impeller for Mercury/Mariner outboard motors is a CEF Marine spare part for the cooling water pump on documented 40–60 hp 4-stroke engines. The impeller creates cooling water flow through the engine's cooling system and replaces OEM no. 47-19453T.
The impeller is made of flexible neoprene and has six blades as well as a plastic hub. It is keyed and measures 19.25 mm in inner diameter, 78.2 mm in outer diameter, and 25.15 mm in depth.
The CEF manufacturer number is 500378, while the shortened manufacturer code is 378. The product is an aftermarket spare part and not an original Mercury or Mariner part. Gasket and impeller key are not included.
Secure compatibility is Mercury/Mariner 40–60 hp 4-stroke, when the engine's spare parts catalog specifies OEM no. 47-19453T. The impeller is not intended for BigFoot models. Selection should be made based on the engine's full model, serial number, gear housing, and original spare part number rather than the hp rating alone.
Replaces OEM numbers
Mercury/Mariner 47-19453T. Older references include 47-19453 and 19453. Documented aftermarket cross-references are Sierra 18-8900 and Mallory 9-45301.
Related spare parts
Documented parts for use with the OEM impeller include upper water pump gasket 27-822189, lower water pump gasket 8M0224241, and impeller key 28-19699. The lower gasket 8M0224241 replaces the previous reference 27-8M4502052. The parts are not included.
Always check the engine/drive model and original part number before purchase.
Key featuresWater pump impeller for the engine cooling system
For Mercury/Mariner 40–60 hp 4-stroke
Replaces OEM no. 47-19453T
CEF manufacturer number: 500378
Neoprene impeller with plastic hub
6 flexible blades
Keyed hub
Inner diameter: 19.25 mm
Outer diameter: 78.2 mm
Depth: 25.15 mm
