[C320-list] Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and Autoprop

[Greg Flanagan]

Here is my 2 cents worth: My 2006 edition had serious blocked heating core issues in 2011 including the elbow (completely blocked) and blocked cooling tubes. It all had to be redone. An excellent Yanmar certified mechanic (and friend) told me to rev the engine to 4000rpm for a short burst after stopping  in a marina berth or anchorage. This will clear the system. So I have been doing this for 10 years now and on inspection my tubes are completely clean, as is the elbow.  He also taught me that there is a small inspection port on the elbow where using a ‘digital exam technique’ you can feel (inspect) the inside of the elbow without dismantling anything. This exam is and has been done annually. 

Cheers,

Greg
Hoop Dancer #1076
Sidney, BC

> On Jul 5, 2021, at 11:59 AM, John Morrison <sail-ability at sympatico.ca> wrote:
> 
> When is the issue with the exhaust elbow appearing? I’ve got 1300hrs on my engine and no sign of it yet. Is this perhaps a salt water issue?
> JohnM 
> 1999#574
> 
> Sent from my iPhone
> 
> > On Jul 5, 2021, at 12:38 PM, RONALD HODEL <ronandgail2 at me.com> wrote:
> > 
> > are elbow to my spare parts on board. It is considered a consumable. 
> >>> 
> >>> Ron Hodel
> >>> #1070 Lokomaikai 
> >>> 
> >>> Sent from my iPhone
> >>> 
> >>>>> On Jul 5, 2021, at 7:25 AM, Dick Walker <dickwalker at att.net> wrote:
>