[C320-list] Engine/Fuel Issue with my 2001 Yanmar

[Chris Burti]

These are symptoms of two common ailments for C-320's with Yanmar
engines of our  vintage. they have been alluded to in the other
responses.

The first, and most common, is that Catalina installed a check valve
in the return line and when these fail, they allow air to run up
return line to the injectors. Mack Boring posted a Yanmar tech
bulletin advising removal of the check valve and they at one time also
offered a kit (a bit pricey) to accomplish the repair. I am reasonably
certain that the the bulletin is in the Association website. If not,
let me know and I will see if I can resurrect it.

The second common problem is that there is a nickle crush washer on
the upper bleed screw at the front of the engine in the fuel line just
before the injectors...if this washer is over torqued, it will leak
air...$1.00 replacement part.

On Mon, Nov 7, 2011 at 6:05 AM,  <tjdames at comcast.net> wrote:
> All,
>
> I am hoping that someone has had a similar experience and can provide me with some guidance. As of late I have been having an issue with my engine (Yanmar - for my 2001).
>
> When the issue began 3 weeks ago,  the engine started fine, ran for about 3 minutes, than sputtered and would not restart. When it stopped it sounded/behaved like a lawnmower running out of fuel.
>
> My mechanic said it had to be "primed", which he did, and it ran fine for ablut 30 minutes until he shut it off, and let it sit over night. The next morning, the same thing happened, it ran for a few minutes and sputtered out.
>
> He now tells me that he suspects fuel is draining back to tank through the fuel sytem and he is going to "install a check valve" into the system. that will "hold fuel in system". Please note that half of my current fuel is new this year, purchased very early in the season.
>
> Has anyone ever had a similar experience and does the mechanic's solution seem logical?
>
> I would appreciate any thoughts!
>
> Thanks,
> Tom Dames
> Whisper 708
>



-- 
Chris Burti
Farmville, NC