[C320-list] Yanmar 3GM issues

[Bob Borelli]

When I have trouble starting my M30 engine,
And need to continuous turning over hoping to start
I remove the drain plug on the Aqua Filter (9/16" wrench)
So I can turn the engine over at 30 second or more intervals
with no worry about back filling the exhaust hose, elbow, exhaust manifold
which would be a very serious error!
Easy to pump water out of the bilge & return drain plug to Aqua Filter.
When lucky enough to have solved hard to non start problem.
To date my problems have been air leaks & a brand new dirty primary filter from debris stirred up from bottom of tank.
I've have had a work request to polish the fuel with hope to get the bottom debris out of the tank.
And I keep several spare primary & secondary filters onboard for the next unexpected time diesel fades or hard to start.

I'm thinking of replacing the 3 injectors with new from Part4Engines
instead of sending to shop for test and rebuild.
M30 has  1650 engine hours.

Bob  1995 C320 no. 209  moored on the Sassafras
________________________________
From: C320-list <c320-list-bounces at lists.catalina320.com> on behalf of Jeff Smith via C320-list <c320-list at lists.catalina320.com>
Sent: Sunday, July 14, 2024 6:11 PM
To: C320-List at catalina320.com <C320-List at catalina320.com>
Cc: Jeff Smith <svsailmates512 at gmail.com>
Subject: Re: [C320-list] Yanmar 3GM issues

How many hours on the engine? This is how many problems started on my
Perkins with approx. 1,150 hours. After much troubleshooting, I had my
injectors and injection pump rebuilt (not at the same time). That solve the
issue.

The advice the shop gave me was to start with a clean container of diesel
and work backwards from the injection pump. It is probably with changing
the two filters first (approx. $50), before you start taking fuel lines
loose and plugging them into the clean tank of diesel. However, this method
is how I diagnosed my issue.

I also installed ann electric fuel pump. I simply turn it on after changing
the filters. It usually eliminates the need to bleed the system, or it
makes bleeding extremely easy.

Good luck,
Jeff
#121

On Sun, Jul 14, 2024 at 4:51 PM Louis Friedman via C320-list <
c320-list at lists.catalina320.com> wrote:

> Hi all, looking for thoughts here- went out for a sail today -engine took
> a lot of priming to start but then was fine. After 2 hrs sailing it
> wouldn’t turnover despite more priming. Had to sail it into the mooring.
> Someone suggested  maybe a fuel line clog or I need to change the primary
> fuel filter? Both fuel filters were changed upon launching in May- would it
> make sense to change again ?  Picked up Nigel Calders book on diesels but
> still learning.
>
> Lou
> S/v Miss Adventure
> #623
> Sent from my iPhone