Yamaha Water Pump Impeller Direction

The rubber impeller is located inside a stainless steel cup and uses the water for lubrication. For these reasons it s best to replace your water pump impeller or the entire water pump assembly when servicing these items and never rotate your outboard s crankshaft or driveshaft in a counterclockwise direction. If you do this correctly the arms of the impeller will curve to the left.

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If your yamaha 90hp water pump has been neglected for some time it may also be necessary to replace.

Yamaha water pump impeller direction.

Learn from my mistake and check. Install water pump housing turn driveshaft as you place the housing on top of the impeller. We recommend you buy the complete yamaha water pump repair kit as it includes the various gaskets o rings and other parts that usually need replacing when you repair the water pump it s much cheaper to buy the complete kit than it is to buy the impeller gaskets and o rings separately. I applied some grease to the slots for the o rings to help hold them in place.

Re install the water pump housing. If you did not notice they were all missing or you forgot then remember that all of these motors rotate clockwise. Apply thin coat of multipupose lube to inside of the pump cover. Impellers must turn in a direction so that the fluid is pushed not scooped through the pump see sample drawing below.

Be sure the o rings stay in place. Exceptions are pumps with straight vane impellers vanes perpendicular to the shaft and shrouded impellers. Rotate the drive shaft clockwise and at the same time push down on the pump cover to ease entry of the impeller into the cover. This needs to be fixed.

You will turn the driveshaft clockwise for standard right hand rotation models. As you slide the housing down rotate the driveshaft to align the impeller housing with the pump housing until it slides all the way down over the dowel pins. Slide the assembled water pump down over the diveshaft and water pump studs. But again since you will be looking at the bottom side of the water pump you will be seeing it backwards.

If this water is not. Straight vane impellers function in either direction. While trying to get this on i flipped the impeller. Shrouded impellers turn so they scoop the fluid.

I need to take it apart and turn it clockwise. Remember the direction of the impeller vanes if any were left on when you initially lifted the housing off. Clean the water pump housing.