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

[Joe Luciano]

Even in fresh water, I believe you will still get corrosion from hot exhaust gases mixing with water at the outlet 180 to the muffler.  When was the last time it was replaced?  If never, you might want to look there....

Joe Luciano 
2005 C-320

Sent from my iPhone

> On Jun 7, 2020, at 8:47 AM, Ted Harrison <tharrison at innovations-plus.com> wrote:
> 
> My thought. A piece of the impeller is inside water pump.
> 
> Ted Harrison
> 
>> 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*