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

[Paul Rickman]

This is a known problem with some Yanmar installs.
 
I've had the Yanmar checked by two mechanics and they found
nothing wrong. Once my 1999 starts it runs smooth, it continues
to run without fail. As long as it gets started at least once every three
days, it does fine. But it can be really hard to start if it sits for a week.
What I've learned to do is pump up using the fuel pump on the engine,
pumping it really fast for several strokes. It starts, it chokes but it runs
smoothly after a min. According to one mechanic, there is no check valve
on my engine.  I've just learned to live with it. 
 
Paul
Affinity 657
Bay Bridge Marina
Chesapeake Bay, Maryland


________________________________
From: Chris Burti <clburti at gmail.com>
To: C320-List at catalina320.com
Sent: Monday, November 7, 2011 12:11 PM
Subject: Re: [C320-list] Engine/Fuel Issue with my 2001 Yanmar

I forgot to add...if you can pump up the fuel line with a half a dozen
or so strokes on the pump on the Racor filter and the problem goes
away until the engine has not been run for a few days...it is almost a
certainty that the cause is one of the problems that I just discussed.

On Mon, Nov 7, 2011 at 11:50 AM, Chris Burti <clburti at gmail.com> wrote:
> 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
>



-- 
Chris Burti
Farmville, NC