Water Pump Impeller replacement difficulty?

[Playzoutside]

I'm a boating rookie and need to know if water pump replacement is something I could do. I'm pretty handy, I reckon. Do I need some special tools for teardown/rebuild? It's an NS90A 3B7-1. Thanks!

 

[Sea Rider]

Re: Water Pump Impeller replacement difficulty?

Just need standard tools, take pictures while disassembling lower unit, just in case, you never know...

Happy Boating

 

[millacd]

Re: Water Pump Impeller replacement difficulty?

make sure you install the impeller with the blades facing the correct way (same way of the old one when you take it out). i'm not sure if it makes a difference or not though, but i've been told it does.

spray pb blaster on your bolts and wait a good bit, try not to break them. If they are really sticky, reapply pb blaster and wait longer and/or tap the wrench gently with a hammer (as if you are trying to hammer in the bolt, NOT hitting the handle of the wrench with the hammer) while you are applying torque in a controlled manner.

when reassembling, apply antiseize or marine grease generously to the bolts. i just use marine grease.

DON'T overtorque the bolts holding the water pump assembly together. its usually plastic and can crack by overaggressive torquing. it really just needs to be snug plus a tiny bit more.

Torque footbolts to spec

 

[Playzoutside]

Re: Water Pump Impeller replacement difficulty?

Outstanding! Thanks for the tips fellas. I really appreciate it! Hopefully I can have the parts by this weekend and get at it.

 

[texcl]

Re: Water Pump Impeller replacement difficulty?

I just changed the impeller on my tohatsu 20 4 stroke. it took 15 minutes and was a piece of cake.

 

[ronboonville]

Re: Water Pump Impeller replacement difficulty?

I may be a little late in this thread. The shift rod connector is up under the motor, has a roll pin in it. Also it might be apparent to you that the impeller keyway is closed on one side. If you're not paying attention it will push the key out when you slide it back together. So the next day when it won't pump water do it over like me. Getting the blades in the right way was difficult for me but persevere. I keep a piece of wire next to the motor so I can unplug the pee hole because some kinda insect always plugs it up.