1991 Johnson 9.9 water pump problem

[Flounder pounder]

Well I installed a new water pump. At idle and low<br />speed it pumps water ok but a sporadic flow and not evenly. At very high speeds it stops pumping water all together and I think it will not pump again until I take everything apart and re-assemble it again. What am I doing wrong?<br />

 

[R.Johnson]

Re: 1991 Johnson 9.9 water pump problem

Did the engine over-heat before you replaced the pump? Did the old impellor break up?

 

[Flounder pounder]

Re: 1991 Johnson 9.9 water pump problem

Yes,<br /><br />The son-in-law burnt the old impellor up pretty bad,<br />Not totally, but some breakage.

 

[DJ]

Re: 1991 Johnson 9.9 water pump problem

You have some pieces of the old impeller blocking a water passage or two.

 

[Flounder pounder]

Re: 1991 Johnson 9.9 water pump problem

Flush it as best as possible or what?

 

[Solittle]

Re: 1991 Johnson 9.9 water pump problem

FP - Best bet is to pull the head & look for crud & impeller pieces. Also backflush through the water pickup tube.<br /><br />Use new headgasket on reassembly.