[Rhodes22-list] Yamaha (non) cooling system.

[Andrew Collins]

Bob

Sorry I can't help with the motor problem. All ob's , Merc, Johnson  
and Honda all drained themselves as soon as they were raised.

Your old boat recycled in 2006 is doing fine though

Andrew
S/V Carmen

On Nov 3, 2008, at 16:11, Robert Fuller <Bobandsandy at tampabay.rr.com>  
wrote:

> Rare post from dedicated reader :
> I have little mechanical ability and paid a free-lance mechanic to
> change the impeller on my Yamaha 9.9 with a total of less than 75 salt
> water hours on it after 2 years. Rapid onset of problem. Impeller was
> fried.  Still didn't pee right and today we found the cooling tube
> running from the lower unit up thru the oil pan was more than 50%
> occluded by a lining of soft corrosion (also extending on up towards
> the motor head).  He says the basic problem is yamaha uses substandard
> aluminum  in the oil pan (and he has seen pans expand and burst
> through motor housings).
> I flush the motor religiously for a timed 10 minutes after every short
> use.  Mechanic further claims the thermostat can cause flush water to
> remain in motor rather than drain and that this can be remedied by
> drilling a small vent thru thermostat.
> I have never seen this problem reported in several years of reading
> posts.  Does it make sense to anybody?  Other thoughts?  Especially on
> preventing recurrence?
> Lower unit and powerhead currently in his shop where he plans to check
> functionality of water pump and see if I blew head gasket. (back
> pressure then impede water flow).
> Bob in Cortez, Fl.
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