View single post by Esprit2
 Posted: 08-01-2016 02:43 am
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Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 338
Brett Gibson JH5 20497 wrote:
(Snip)... A new impeller cost about $40 but most of the time you can re-use your old one, or better yet get a 910 impeller rather than the 907 and increase your water volume flow and keep the engine running cooler. (some machining is required to use a 910).Place a J-H and a 910 impeller side by side on the table, and you'll easily see that the 910 impeller is taller. It will not fit into the J-H pump housing.

Take both impellers to a machine shop and have the 910's center boss / snout shortened to match the J-H impeller's overall height. It will then fit in the housing, and the rest of the assembly steps are as standard.

Early 910 impellers had a 1/2" bore(same as the J-H), while later ones have a 12mm bore. Either one will work in your J-H pump housing (once machined to fit), you just have to buy the bearing with the matching impeller shaft diameter.

Tim Engel