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Author Topic:   impeller, water pump question
baybug posted 02-25-2004 10:58 AM ET (US)   Profile for baybug   Send Email to baybug  
I have a 90 HP Yamaha, 1997, that I want to maintain it properly to ensure long life. I've read a couple of posts that suggest changing the impeller, impeller water pump, and the thermostat every couple of years. The previous owner kept the boat and motor in great shape but I don't believe he did anything aside from lower end unit grease and plugs (or had any reason to).

I haven't had a problem, but yet I want to keep the motor running strong for many years thru preventive maintenance. I was looking for opinions as to whether or not I should have each of these replaced and if that makes realistic sense. What I don't want to do is replace things just for the sake of replacing them.

Bigshot posted 02-25-2004 11:33 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
That is not frivolous maintenance, it has to be done every 2-3 years. If you don't do it, you will pay dearly later. Changging your water pump not only assures you of proper cooling but needs to be done periodically. Reason being there is grease on your driveshaft where it goes into the crank, this washes away with use and your lower unit can stick in your crank. Not a good thing and can mean the demise of your engine. Thermostats are constantly circulated with water, they rot and can malfunction. My 225 blew a piston partially due to bad thermostats.

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