Yamaha Water Pump Impeller Direction

Learn from my mistake and check. If this water is not. Clean the water pump housing.

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I need to take it apart and turn it clockwise.

Yamaha water pump impeller direction. I applied some grease to the slots for the o rings to help hold them in place. But again since you will be looking at the bottom side of the water pump you will be seeing it backwards. Slide the assembled water pump down over the diveshaft and water pump studs. While trying to get this on i flipped the impeller.

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. 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. Re install the water pump housing. Be sure the o rings stay in place.

Remember the direction of the impeller vanes if any were left on when you initially lifted the housing off. If you did not notice they were all missing or you forgot then remember that all of these motors rotate clockwise. The rubber impeller is located inside a stainless steel cup and uses the water for lubrication. 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.

Install water pump housing turn driveshaft as you place the housing on top of the impeller. Shrouded impellers turn so they scoop the fluid. Impellers must turn in a direction so that the fluid is pushed not scooped through the pump see sample drawing below. Apply thin coat of multipupose lube to inside of the pump cover.

Exceptions are pumps with straight vane impellers vanes perpendicular to the shaft and shrouded impellers. If you do this correctly the arms of the impeller will curve to the left. 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. You will turn the driveshaft clockwise for standard right hand rotation models.

This needs to be fixed. If your yamaha 90hp water pump has been neglected for some time it may also be necessary to replace. Straight vane impellers function in either direction.