johnson hd 2.5 water pump troubles

[horsefly38425]

my old 2.5 ser 771856 is giving me some pump troubles it looks as if every thing is in place but it's one of the frist with this pump location i have been in. ck'd to make sure tube is not pluged .OK .nothing looks worn or bad , but there is no imp. just a rubber seal with a cam with a dail pin in it spacer,and seal that water tube goes in . nobody local knows what one looks like .anybody have digram of one 'where can ifind parts if i need them

[rickdb1boat]

Hi horseflyWe would need a Model number to verify the year. Can't get it by serial number. I'm not familiar with the 2HP, but I'm sure others are. See if you can locate the model number in the meantime. Something like 2R72, 2r73, Ect.. Try the same place you found the serial number or look on the transom bracket for other numbers.

[horsefly38425]

hd25

[Chinewalker]

Hi Horsefly, Your motor has a rubber plunger pump. Typically, the cam wears on the center hole, making the plunger plunge less and less as it wears. You might be able to make a sleave or something to take up the slack... I'm not sure if anyone is making replacement impellers for those or not. Might want to try over at the www.aomci.org links page.- Scott

[horsefly38425]

that is good i think the cam is Ssteel/yes i can bushing the rubber piece or make a new one .still don't know just how it works /from the rear ,left side is intake/right is up take, but i don,t understand how water flows but i saw the wear pattern on the spacer and it looked like a viberating pump/