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Guys I have been having a water pump problem on my 1957 18hp erude. It pumps water great at speed but at idle it sometimes quits. I have had it apart twice now changed the impeller twice and the grommets looked good. I was checking the water pump housing for wear and that looked good. I pulled the grommet for the water tube out and I noticed a mark on the side of the grommet. A small drilling was blocked by the grommet. Maybe there is a shorter grommet? I don’t know. Do you guys think this drilling in the housing being blocked could be my problem? Engineering put the hole there for something! Maybe the pumps need water on the top to make it work? Anybody have experience with a problem like this. Pictures coming!
dale
“There are three kinds of men. The ones that learn by readin’. The few that learn by observation. The rest of them have to pee on the electric fence for themselves!” WR
Here’s another view showing how that hole is drilled on an angle. It and the small bleeder hole at the bottom of the well must both be clear and open for the pump to work properly.
I have had a few cases where I had deemed the pump housing good enough, as the engine was pumping okay before service…..but then would not pump well at idle with a NEW impeller. The trouble is, the old housings and impellers wear together and fit like a glove, in some respects. A new impeller doesn’t fit into the old wear pattern as well. Changing the housings to new ones solved my problems astonishingly well. I guess this was me, peeing on the electric fence, right? By the way, what is going on with the bottom of your grommet? It looks torn up somehow, in the picture.
Long live American manufacturing!
I have had a few cases where I had deemed the pump housing good enough, as the engine was pumping okay before service…..but then would not pump well at idle with a NEW impeller. The trouble is, the old housings and impellers wear together and fit like a glove, in some respects. A new impeller doesn’t fit into the old wear pattern as well. Changing the housings to new ones solved my problems astonishingly well. I guess this was me, peeing on the electric fence, right? By the way, what is going on with the bottom of your grommet? It looks torn up somehow, in the picture.
Some people gotta learn the hard way! me too! I cut the bottom of the grommet so it won’t plug off the small drilling in the housing. I think that will fix my problem. Wonder how many other motors around are messed up? Those pump housings are getting harder to find lately.
dale
the new pump housings on Amazon don’t have those holes ??? Mumbles… did you ever install the cheap ones ($25) you picked up before all of us 🙂
is it because “the well filled with water, creating a water seal to prevent exhaust gasses” is not molded / needed like the original pumps ?
Joining AOMCI has priviledges 🙂
Crosby, are you sure there are no bleed holes in the new housing? I don’t have one to look at, but I do have this OEM one which I think is for a 35hp. They went out of their way to deal with the shaft hole. First, they added a seal, then they also added a slot between the outlet tube and the area between the the plastic housing and the stainless cup.
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