smoked impeller after 10 minutes

[tpsball]

1990 omc 4.3L running hot, changed impeller, tested with muffs to make sure water was discharging, put in water and engine heats up to 200* and keeps going, ran for about 15 minutes at most, checked impeller and was melted and cage was rotated 90* I did remove the inlet hose and it was pumping a good amount of water. I'm at witts end, Please help.... Thanks

 

[Rob_NC]

Re: smoked impeller after 10 minutes

1990 omc 4.3L running hot, changed impeller, tested with muffs to make sure water was discharging, put in water and engine heats up to 200* and keeps going, ran for about 15 minutes at most, checked impeller and was melted and cage was rotated 90* I did remove the inlet hose and it was pumping a good amount of water. I'm at witts end, Please help.... Thanks

..thermostat stuck closed...?

 

[Don S]

Re: smoked impeller after 10 minutes

Did the oring on the impeller housing get replaced? You didn't overtighten the housing bolts and distort it did you?

You now need a complete new pump housing and impeller.

 

[tpsball]

Re: smoked impeller after 10 minutes

yes, I replaced the o-ring and did not overtighten the bolts. I'm thinking maybe there is an obstruction and the impeller is working too hard and it's burning them out... GRRRRRRRRRRRRRR