Home › Forum › Ask A Member › 9.9/15 impeller housing tricks? › Re: 9.9/15 impeller housing tricks?
OK, well the 1978 models still had the good upper water tube grommet, so reuse what you have it is original! The replacement will be the bad grommet.
There was no gasket used on these engines between the impeller plate and gearcase, so am concerned about what you have going on there. I’m assuming the gearcase to impeller plate mating surface is OK also. Is the block badly discolored from overheating? The only other thing that comes to mind is perhaps the water intake screens are plugged with test tank debris, or perhaps barnacles on the inside if the engine was left tilted down in the water.
At this point, I would probably purchase a complete OEM water pump kit, with the housing. A stuck thermostat would surely cause an overheat as well, the only "bypass" on this engine is through the small bleed hole/notch on the thermostat. Does it look as though this engine has been messed with before (head gasket/exhaust gaskets)? Post some pictures here if you can. Don