[C320-list] Cooling system

[Joe Luciano]

Agree with the previous post that the only way to replace the elbow is to take it off the boat where leverage can be applied.  That said, I would have never been able to do mine on the dock.  I needed a big vise and a big cheater wrench to get it apart.  The elbow builds up with carbon and corrosion products over time.  My Yanmar dealer said that they typically replace the elbow on this engine in the 5-7 year timeframe.  As it gets restricted, the temp rises and you see the white steam in the exhaust.  The other thing to recognize is that Yanmar made a heat exchanger upgrade at some point from a two pass to a four pass bundle to improve the cooling on the system.  My engine is in a 2005 C-320.  I simply bought the new 4 pass bundle from Yanmar, pulled the aft cover plate and replaced the bundle.  This has helped immensely as my cooling was marginal at full rpm even with a new elbow.

Joe Luciano 
Second Wind
2005 C-320

Sent from my iPhone

> On Oct 11, 2018, at 9:49 AM, Timothy Woods <woodstimothya at gmail.com> wrote:
> 
> Bill,
> 
> The elbow is simple to replace on a yanmar. Remove the elbow and the small
> exhaust manifold at the same time. I took mine out onto the dock and put my
> foot on the manifold and tapped the elbow with a hammer to unscrew it. Look
> close at the threads to make sure your turning it the correct direction.
> 
> I do have question for you. At what temperature was your engine running at
> under load?
> 
> Good luck, Tim
> 
>> On Thu, Oct 11, 2018, 8:56 AM William Russell <wcr6450 at gmail.com> wrote:
>> 
>> I've been noticing what appears to be steam coming from the exhaust
>> discharge lately.  Asked the Yanmar rep at the Annapolis boat show, who
>> said I should replace the exhaust elbow, and do the hose to the Aqualift
>> muffler box at the same time.  Does that make sense to y'all?
>> Where's the best place to buy those parts?  Reading previous posts, I'm
>> assuming this is a job I can do myself.
>> Bill Russell
>> "LIttle Wing," 1998 C320 #545
>> Ithaca, NY
>>