[C320-list] Engine overheating; cooling system not functioning

[John morrison]

I’m assuming that this is a Yanmar engine. If so these engines have no zincs; just to clarify any possible confusion.
JohnM
1999#574
> On Jun 15, 2020, at 2:06 PM, Scott Thompson <surprise at thompson87.com> wrote:
> 
> Unless the impeller was very old or had not been checked in a long time I would be mostly thinking about what caused all of the vanes to fail at once. Did you perhaps suck in some sand? If so the impeller pieces may be just part of the blockage. This happened to me once when I ran the engine hard in reverse trying to get off a sandbar. I did get off, but the engine overheated shortly thereafter.
> 
> Scott Thompson
> Surprise, #653
> 
> 
> On 6/7/2020 2:00 PM, Mike Mellon wrote:
>> Bill, I'd suggest removing both end caps on the heat exchanger and inspecting for pieces of impeller.  You can also check the zinc at the same time.
>> 
>> Mike Mellon
>> LaVida 1996 (Westerbeke 30B)
>> 
>> 
>> On 6/7/2020 9:40 AM, Scott Lagerquist wrote:
>>> If you disconnect the hose going into the heat exchanger and run it into a bucket you could determine if water flow is getting through the pump and hoses.  The small inlet to the exhaust elbow can be inspected with a pick or long skinny object.  If both of those are clear then the blockage may be in the heat exchanger itself.
>>> 
>>> Scott Lagerquist
>>> Sea Esta, 1994, #39
>>> San Diego CA
>>> 
>>> Sent from my iPhone
>>> 
>>>> On Jun 7, 2020, at 8:42 AM, William Russell <wcr6450 at gmail.com> wrote:
>>>> 
>>>> After my high temp alarm went off, I discovered I was getting no cooling
>>>> water out the back end.  I’ve tried many things to fix it, but can’t get it
>>>> working. They include:
>>>> 1) replacing the impeller.  The old one was shredded, with all vanes
>>>> sheared off.  I successfully replaced it with a new one.
>>>> 2) inspecting hoses for pieces of damaged impeller.  Found many in hose
>>>> from pump to heat exchanger, as expected.  But surprisingly, found two in
>>>> the supply hose coming into the pump, and one all the way back in the hose
>>>> between the intake thru hull and the strainer.  Any ideas about how pieces
>>>> could get all the way back there?
>>>> 3) after establishing water flow to the pump, with no apparent blockages
>>>> all the way to the heat exchanger, I still get no cooling water all the way
>>>> through.  There is no water in the muffler tank.  The anti siphon valve
>>>> seems clean and functional.  I ran the engine up to 180 degrees to make
>>>> sure the thermostat could open correctly.  Still no exhaust water out the
>>>> back end.
>>>> This is a fresh-water boat, so no apparent corrosion or salt buildup.
>>>> 
>>>> I’m stumped - any advice?
>>>> 
>>>> Bill Russell
>>>> “Little Wing,” 1998 C-320, #545
>>>> Cayuga Lake
>>>> Ithaca, NY
>>>> -- 
>>>> *William C. Russell*
>>>> *434 Snyder Hill Road*
>>>> *Ithaca, NY  14850*
>>>> *(607) 222-4635*
>> 
> 
> -- 
> Scott Thompson
> Surprise, #653
>