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Author Topic:   Replaced my impeller
Sailor Rob posted 05-04-2008 04:48 PM ET (US)   Profile for Sailor Rob  
Yesterday I replaced the impeller on my 2005 4 stroke 90HP merc. It took three hours because it was my first time. I run in salt water and flush regularly. 100 hours on the engine after three years. I noticed heavy salt deposits around the four bolts that hold the water pump cover to the lower unit. How would these bolts get salt water exposure? Does water ciculate (or drip) into the space outside of the pump cover? Is that the water which exits from the prop?

The gasket underneath the impeller's wear plate did not have any sealant where it contacts the lower unit. I put the new gasket in dry as well because this was the first time the impeller was replaced so I copied what the factory did. There was some salt deposits and corrosion which I removed before laying on the gasket to ensure a smooth surface and tight fit. Some say apply loctite to the bolts others say use grease. I cleaned the threads of salt and put them in dry and torqued proper. Getting the lower unit back on was much easier that working it off because of salt deposits which I cleaned off before re-assembly.

I learned a lot about what's inside that "black box"!

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