Originally posted by amgonner
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After the boats on the lift, I run water thru the power head attachment maybe 15 minutes. I then run it on the muffs only so the engine warms up and water goes thru the thermostat (which would have been closed with JUST the attachment.
Make sure you use the proper Yamaha grease on the Drive shaft when you pull the lower unit. There's a bushing in the mid section that WILL SQUEAL if you use anything else.
With the LU off, there are TWO drive shaft seals under the water pump plate. They do fail over time, one of mine (the SS little spring) broke, but no water intrusion (low hours too, always flushed). I'd probably be replacing those while the LU is off.
If the boat doesn't have an aftermarket, transom fuel filter /water separator, I'd strongly suggest installing one. 10 micron..
PM sent as well..

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