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In this video the water pump impeller of an old Yamaha 2-stroke outboard is changed / checked. Changing interval is normally 3 years or 300 h.
Lower unit has to be removed to be able to change the impeller. Before removing the lower unit, gear selectors axle have to be detached. Axle has two nuts. Longer nut attaches the axles and smaller locks the longer one. Two 10 mm ring wrenches is needed to do that for this Yamaha motor. Next thing is to detach the bolts that hold the lower unit. In this motor there is four 12 mm bolts. After detaching the bolts, the lower unit should come of by pulling the lower unit. It might be a bit tight if it hasn't been detached for a while.
Impeller is inside a plastic casing. Casing need to be removed. In this case there are four 10 mm bolts. Bigger Yamaha motors have 12 mm bolts. First is removed the plastic casing. Under the casing is o-ring and metal cover. Under the impeller there is a small axle key which locks the impeller to spin with the axle. Don't lose the key. If the impeller hasn't been changed in a while, there might be some lose dirt or similar. Make sure to clean everything before re-assembling. Remember to install the axle key with the impeller. re-assemble in opposite order than disassembly. Remember to turn the axle clockwise when installing the casing on top of the impeller.
#outboardmaintenance #outboardimpeller #impellerchange
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