Before the pressure tests, etc. suggested by Josh, check/replace radiator cap. 
Gasket on it may be leaking or spring may be tired after many years of life and 
lots of engine time.

Charlie Nelson
1995 C&C 36XL/kcb
Water Phantom

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On Sunday, October 7, 2018, Josh Muckley via CnC-List <cnc-list@cnc-list.com> 
wrote:

Buy/rent a coolant pressure tester.  They attach to the radiator where the cap 
screws on.

Do you have a water heater that is heated by the engine?  I do and my fittings 
weep a small amount.

Check for leaks in the engine heat exchanger tubes and heads.  Disconnect the 
inlet and outlet seawater hoses.  Plug the outlet securely.  Pressurize the 
inlet with air.  Check for bubbles in the glycol by removing the radiator cap.  
Be careful not to use too much pressure.  5 to 10 psi would probably be 
sufficient.  You can disassemble the seawater to freshwater heat exchanger and 
check for holes.  I would guess that this is the most likely cause.

Josh Muckley 
S/V Sea Hawk 
1989 C&C 37+
Solomons, MD 




On Sun, Oct 7, 2018, 4:28 PM bwhitmore via CnC-List <cnc-list@cnc-list.com> 
wrote:
Hello all, 

1 have a 1994 C&C 37/40+ with a Yanmar 3JH2E engine.  When I changed the 
coolant last year, it seemed like about 12 oz less coolant went back in.  Since 
then. I've noticed the overflow tank seems to be dropping a little, and I've 
topped it off 3 or 4 times.  In total, I've probably added 16 to 32   ounces of 
coolant.  The exhaust exits the boat downward, so I don't get a good view of 
the existing exhaust,  but I'm not seeing evidence of steam as I would expect 
if I had a head gasket leak.  The oil looks fine.  There's no evidence of oil 
in the coolant.  There's no evidence of coolant leaking externally ( ie orange 
in the engine bilge).  We get the boat off the dock 4 to 6 times a month, each 
time motoring about an hour per trip (30 minutes out, and 30 minutes back in 
after sailing.  I've only owned the boat about 18 months, so there could have 
been a preexisting condition.

Any ideas, and is there a way to figure out what is going on?  Should I be 
worried?

Thanks!

Bruce Whitmore 

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