Quick Question on Water Pump Maintenance

[bobStash]

I am gearing up to swap the impeller in my Yammy 90hp 4 stroke. My question is - do I just replace the impeller ($30 item # 24) or should I purchase the entire water pump repair kit ($60 item number 22)?

My hunch is the more expensive repair kit but I would like to hear from ya'll as to whether it is really needed

[geronimo]

usually depends on how many hours on the unit. If you have allot of hours and you have the lower unit apart, go for it,, water pumps and impellers are a vital part of your boating "peace of mind" My suggestion is to do them both. Cost will be a slice of heaven compared to loosing all water flow from the pump, while out in the boat.

[jack14]

If I were going to the trouble of dropping the lower unit and pulling everything apart I'd go with the full kit. Especially when the cost difference is minimal.

[welder]

Do the whole kit , it's cheap insurance.

[cracker]

Do the whole kit , it's cheap insurance.

X3 I would also do the Thermostat at the same time and maybe the poppet valve... Both are very quick and easy to do on my F115 so I would assume the same on your F90

[jigger]

Change the impeller and housing. Also change the thermostats. So when you do your bianual repair everything will be changed at the same time.

[deltarome]

I am gearing up to swap the impeller in my Yammy 90hp 4 stroke. My question is - do I just replace the impeller ($30 item # 24) or should I purchase the entire water pump repair kit ($60 item number 22)?

My hunch is the more expensive repair kit but I would like to hear from ya'll as to whether it is really needed

Bob, it depends on how many hours your engine has since last rebuild and what type of water you run in. If you live in clean freshwater, i would replace the impeller. If you run in saltwater and silty water, i would replace the assembly.

Same holds true if you change impellers every 100 hours or if you wait longer.

If in freshwater and do it every 100 hours, change only the impeller. If in silty water, change assembly.

[triumphrick]

I was replacing my impeller every other year(about 100 hrs) and the whole kit every 200 hrs. This worked on my 90 Yamaha for ten years. If they ever overheat, have a real good look at the plastic housing, as they do not come in the kit and may need replacing. Good luck!