Synthetic Rubber
Propeller is external (outboard motor on a boat) Impeller is internal (vehicle water pump).
The water pump impeller on a 7.5 hp Mercury outboard, is located on top of the gearcase, and is driven by the driveshaft.
The impeller is located inside the water pump housing, on the topside of the gearcase. The gearcase will have to be removed in order to service it.
First, remove the lower unit (there is a housing for the water pump). The drive shaft goes through the housing and turns impeller. Remove the housing, the impeller is on the shaft. Install the new impeller. When replacing the housing, turn the drive shaft clockwise to make it slide down over the impeller.
No power to pump. Motor burned out. Intake is clogged. Impeller disconnected from motor.
The impeller pump on a motor vehicle is more commonly know as the water pump. The water pump, pumps water through your cooling system to keep your vehicle from running hot.
Every two years to be safe
Change the water pump impeller, they get old and need replacing every 5 years or so depending on wear.
The 15 horsepower Mercury outboard motor does not have a water pump. The outboard motor is air cooled and does not have a need for circulating water.
Sprinkle liberally a vile of gypsy tears
I had a look to se if I could find a craster pool pump and had no luck however the impeller on every pool pump I have ever seen is in the impeller housing which is bolted straight against the motor.
The water pump on an outboard motor is located low down on the skeg. To replace it, you have to remove the lower unit. The impeller water pump is a housing attached to the upper unit, surrounding the shaft. It must be replaced exactly right, so obtaining a proper servicing manual is strongly recommended.