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water pumping
i have just put my outboard (mercury 500) back together, after
removing the exhaust plate to clear the pipes of corrosion, as the water flow was very slow. It started first time, which i was very pleased about, but the water flow is worse than before, the only thing i can think of is that the water pump is missing a couple of seals, going to the water pipe and the drive shaft, would this be reducing the pressure of the water so much that it would not pump water round the engine properly? i have run out of ideas, and any input would be grately appreciated. p.s. i have attatched the garden hose directly to the water pipe and water pumps out the the exhaust and tell tale fine, so the problem must be around the pump. thanks a lot |
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Re: water pumping
abu41b@bangor.ac.uk wrote:
>so the problem >must be around the pump. Just a guess (as I do not know that engine): Is the impeller slipping on its shaft? If replaced, does it run in the correct direction or can it be mounted the wrong way? Can the water short circuit, meaning running directly from the high pressures side back to the low pressure side past the impeller? With best regards, Uwe |
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Re: water pumping
On 3 Sep, 15:30, Uwe St?ckel <my_m...@gmx.com> wrote:
> abu...@bangor.ac.uk wrote: > >so the problem > >must be around the pump. > > Just a guess (as I do not know that engine): > > Is the impeller slipping on its shaft? > > If replaced, does it run in the correct direction or can it be mounted > the wrong way? > > Can the water short circuit, meaning running directly from the high > pressures side back to the low pressure side past the impeller? > > With best regards, > Uwe hi, thanks for the reply, i have put the engine in a tank today, instead of just using the muffs, it was pumping then, i dont know if this means that the pump is working but not very well, should water come out of the tell tale with muffs? (they are a bit perished) i dont think the impeller can slip, but it does seem to be very tight in the pump, and quite hard to turn by hand, is this normal? i have checked that it is placed the right way, which it is, and it cant bypass the impeller. thanks a lot for the help it is much appreciated. patrick |
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Re: water pumping
abu41b@bangor.ac.uk wrote:
>On 3 Sep, 15:30, Uwe St?ckel <my_m...@gmx.com> wrote: >> abu...@bangor.ac.uk wrote: >> >so the problem >> >must be around the pump. >> >> Just a guess (as I do not know that engine): >> >> Is the impeller slipping on its shaft? >> >> If replaced, does it run in the correct direction or can it be mounted >> the wrong way? >> >> Can the water short circuit, meaning running directly from the high >> pressures side back to the low pressure side past the impeller? >> >> With best regards, >> Uwe > >hi, thanks for the reply, i have put the engine in a tank today, >instead of just using the muffs, it was pumping then, i dont know if >this means that the pump is working but not very well, should water >come out of the tell tale with muffs? (they are a bit perished) i dont >think the impeller can slip, but it does seem to be very tight in the >pump, and quite hard to turn by hand, is this normal? i have checked >that it is placed the right way, which it is, and it cant bypass the >impeller. thanks a lot for the help it is much appreciated. Patrick! I have seen this before when using muffs. I think in this case ist still a bit air in the pump reducing the pump performance so I personally prefer using the tank for testing. In my personal opinion the telltale must wurk when the motor ist fast idling in a reasonable large tank (like a 200 l barrel). If it does not work then, there is still a sereous problem. With best regards, Uwe |
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Re: water pumping
On 4 Sep, 07:20, Uwe St?ckel <my_m...@gmx.com> wrote:
> abu...@bangor.ac.uk wrote: > >On 3 Sep, 15:30, Uwe St?ckel <my_m...@gmx.com> wrote: > >> abu...@bangor.ac.uk wrote: > >> >so the problem > >> >must be around the pump. > > >> Just a guess (as I do not know that engine): > > >> Is the impeller slipping on its shaft? > > >> If replaced, does it run in the correct direction or can it be mounted > >> the wrong way? > > >> Can the water short circuit, meaning running directly from the high > >> pressures side back to the low pressure side past the impeller? > > >> With best regards, > >> Uwe > > >hi, thanks for the reply, i have put the engine in a tank today, > >instead of just using the muffs, it was pumping then, i dont know if > >this means that the pump is working but not very well, should water > >come out of the tell tale with muffs? (they are a bit perished) i dont > >think the impeller can slip, but it does seem to be very tight in the > >pump, and quite hard to turn by hand, is this normal? i have checked > >that it is placed the right way, which it is, and it cant bypass the > >impeller. thanks a lot for the help it is much appreciated. > > Patrick! > > I have seen this before when using muffs. > I think in this case ist still a bit air in the pump reducing the pump > performance so I personally prefer using the tank for testing. > In my personal opinion the telltale must wurk when the motor ist fast > idling in a reasonable large tank (like a 200 l barrel). > If it does not work then, there is still a sereous problem. > > With best regards, > Uwe- Hide quoted text - > > - Show quoted text - thanks a lot for all your help, i took the boat out today, and it was pumping water great, shame the prop wasnt turning, when i put the gear housing back on, the gear shaft didnt enagage with the gear box. what an idiot. ive fixed it now, and ill try again tommorow. thanks again patrick |
