Johnson water pump

[squarehead]

I am rebuilding my old Johnson water pump on my Bukh dv20
The bronze sleave has too much play and allowed water to pass into my engine. Does anyone know what type of bronze is used to make the sleeve?

[bobconnie]

Mostly it's bronze bearing material! it comes in shafts of different outside diamiters, and is machined to fit both inside and outside. Some are made from a oil-light bronze, a material made of oil infused bronze, altho this stuff is not used to much these days ! as other stuff has proved to be better! I mean with the man made stuff around today, nylon, and trick plastics and such, theres a lot of long running bearing stuff out there ! But any little machine shop could fix ya up with bronze one in a short while !

[pbiJim]

If the application supplies no form of lubrication, then you probably need lubrication impregnated bearing material (often called oilite). SAE 840/841 oil impregnated bronze is what you are looking for if that is the situation.

If you have lubrication present (such as water slipping past the shaft), then you can go with a straight bearing material. Alloy 485 navel brass is probably a good choice. Alloy 464 brass is also good, but harder to machine. Alloy 954 aluminum bronze would probably be my top choice for wear resistance. Bronze alloys 360, 220, & 316 would also be good choices.