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

[Scott Lagerquist]

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*