For my Westerbeke, which is also a pain to drain, my mechanic suggested 
installing a valve in the lower heat exchanger hose and, once annually, drain 
what will come out and add new stuff.  He said I will not get all the 
antifreeze out doing it this way, but if I do it annually it won’t matter.

From: David Knecht via CnC-List 
Sent: Thursday, April 11, 2019 8:22 AM
To: CnC CnC discussion list 
Cc: David Knecht 
Subject: Re: Stus-List Universal engine coolant drain plug

To follow up, I found what I am pretty sure is the drain plug near the oil dip 
stick and near enough to the front of the engine to be visible.  It appears to 
be soft brass because it the head was already damaged by someone trying to 
remove it before I tried to get a wrench on it.  I was unable to budge it even 
after leaving PB Blaster on it for a few days.  I am afraid to do much more 
because I am not sure I can find a replacement if I damage it more.  The only 
other thing I can think of to do is to remove one of the hoses from the heat 
exchanger and turn the engine on long enough to pump the antifreeze out.  The 
alternative is to just start filling the overflow with new antifreeze and have 
it slowly exchange over time.  Any suggestions?  Dave



  On Mar 31, 2019, at 2:08 PM, David Knecht via CnC-List 
<cnc-list@cnc-list.com> wrote:

  I need to drain the coolant from my Universal M4-30.  The drain plug in the 
photo I have from the manual is near the dip stick on the side of the engine I 
can reach but can’t see.  The photo in the manual is pretty useless as I can’t 
see what it is pointing to.  Does anyone know more precisely what it looks like 
(size?) or a way to find it by feel (or another way to drain)?  Thanks- Dave 

  S/V Aries
  1990 C&C 34+
  New London, CT

  <pastedGraphic.tiff> 

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S/V Aries
1990 C&C 34+
New London, CT

 




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