identifying my water pump & impeller, Yanmar 3GM30

[skyflyer]

I have been led to believe that Yanmar used different makes of water pump at different times. Unfortuntely the old impeller has no markings on it and the only thing stamped on the pump casing is 5J-224
The pump shaft has a key and is 12.67mm diameter.
Engine circa 1995 or '96
What make of pump is this and what impeller should I buy as a replacement

Thanks

 

[sailorman]

http://www.jamestowndistributors.com/userportal/document.do?docId=732

 

[FWB]

Hiya !
Well Mylor are now Yanmar agents but Cellar Marine at Porthallow are the experts 01326 280214 .

 

[savageseadog]

A simple way - just look at the cover plate - a Johnson pump has a oring seal, the Jabsco has a gasket.

 

[skyflyer]

Cheers - its a gasket!