Conference unifix::sailing

   I would tend to look at two things:
    
    	- Is your "Stuffing Box Packing Nut" too tight?
    	  This could over heat - even bust - the shaft and also put
          abnormal strain on the transmission.
    
    	- By Fresh water cooled I assume you mean heat exchanger &
          anti freeze in the block --
      
          Check the first thing your raw water pick up hose goes to
          after the pump.  Often this is an oil cooler for the
          transmission & has a lot of small tubes in it that the raw
          water flows through -- kind of like a heat exchanger.  
          If you picked up some sea grass it make it through the pump
          but gets hung up in this oil cooler.
    
                        Good luck
                                  Lou_who_is_not_a_Mechanic_at_all
    

    Thank you Lou. You are right,the engine has a heat exchanger and the
    antifreeze level was O.K.
    As for the "Stuffing Box" I just had it replaced during the lay-up
    season with a "Last drop" Now the instructions on the "Last drop"
    say ...not to push the SS ring against the derlin ring more than
    1/4" when you setting it up but because it was leaking too much
    I had to push it about 1". I wonder if because of that the friction 
    between the two rings is much greater and that produces exxesive heat.
    However when I called last drop I was told it was O.K. as long as
    the bellows were not colapsed and that they may have to change their
    instructions.By the way when I talked to the "Last drop" people it
    was just for the adjustment of their item at that time I had not
    noticed the transmission and shaft heat.
    But when I called Mac Boring-Yanmar Distributor-I was told that
    it was possible to be something wrong with cutlass bearing-shaft
    relationship that was transfering the heat from the cutlass to 
    transmission .Well this week-end I probe more,I also will run it on
    low rpm's and see what happens.
    Thanx again.
    

    I can't believe someone told you there could be a problem transfering
    heat from the cutlass bearing to the transmission.
    
    The cutlass bearing is located in your strut which is under water.
    It is separated from the transmission by the shaft which is also
    in the water. What could they mean by this? I would talk to someone
    else.
    

    re: .3    I didn't believe that either,but I had told him that the
    shaft was hot which was not true.The coupling was hot but not the
    shaft. Well last week I run the engine for about 2 hours at 2200 rpm.
    It was running like a kitten,no alarms or lights came on but altough
    I do admit that I may sound a false alarm my intuition tells me
    something is wrong.Transmission casing is still as hot as the block.
    One more thing that makes me worry is that 15 minutes after I shut off
    the engine from the 2 hour run and while I was checking the fluids I
    noticed that the fresh water was LUKEWARM not hot at all.As a matter
    of fact I could have my face washed with it without problem.
    And here comes my new uncertainty because I compare it with my auto water
    cooling system.I know that the raw water thermostat works fine because
    more water comes from the exaust as the engine warms up.Also my hot
    water works O.K.The question I have know is,could it be that the
    fresh water doesn't circulate? Could it be the fresh water pump or
    thermostat that doesn't work and if so how can I determine what is
    wrong? Well enough for now.I am going to my corner again and worry
    more
    
    Happy sailing everybody without problems.The fog lately is enough
    worry.
    
    

    Just to close the loop here.My intuition was wrong.According to Pat
    Donovan from Mac Boring(if you need good info ask for this guy.I
    believe he services engines) the transmission gets realy hot.
    Has to be true the engine runs like a kitten.
    Hope this week end is like last saturday. The force 4 may be with you
    wherever you are.