[C320-list] Yanmar 3GM issues

[Jack Brennan]

Lou, you can get crush washers at any Yanmar dealer. However, there are a couple of sizes, as I remember. You'll want to remove one to ensure you get the proper size.

On a Yanmar, once you fix the leaks, it's easy to bleed the system. Opening the bleed screw for a couple of seconds will do the trick.

You shouldn't have to touch the injectors.

Jack Brennan
Sonas, 1888 Catalina 320
Tierra Verde, Fl.



Sent via the Samsung Galaxy A32 5G, an AT&T 5G smartphone



-------- Original message --------
From: Louis Friedman via C320-list <c320-list at lists.catalina320.com>
Date: 7/30/24 8:58 PM (GMT-05:00)
To: KEN GEIGER <kendgb at aol.com>
Cc: Louis Friedman <loualfr at gmail.com>, C320-List at catalina320.com, Doug Treff via C320-list <c320-list at lists.catalina320.com>
Subject: Re: [C320-list] Yanmar 3GM issues

will take all advice into account, thanks all!  update - went back to take
a look at the fitting to fuel filter and found it's still got a slow leak -
I suppose the reason I need to pump the lift pump to start the engine. see
nut in picture.  previous posts mentioned the crush washer underneath the
nut needs replacing?  If so, where do I get these? then to replace would
need to shut off fuel upstream ?

Lou
#623

On Tue, Jul 30, 2024 at 2:49 PM KEN GEIGER <kendgb at aol.com> wrote:

> I don't know what is inside the mechanical fuel lift pump, but it looks
> like a diaphragm pump and the diaphragms do harden and fail.  Check it out,
> rebuild with new diaphragm or replace then rebuild and you have a spare.
>
> Ken Geiger
> #765
>
> Sent from AOL on Android
> <https://play.google.com/store/apps/details?id=com.aol.mobile.aolapp>
>
> On Tue, Jul 30, 2024 at 2:11 p.m., Doug Treff via C320-list
> <c320-list at lists.catalina320.com> wrote:
> These are great boats. Once you get through these maintenance issues,
> you'll love it. Mine is a 1996 and I have very few problems.
>
> I suspect there may be a leak somewhere (maybe the bleed screw) that
> allows air in the lines. My engine starts very fast. Your symptom
> definitely points to a fuel delivery issue of some kind.
>
> --
> Doug Treff
> doug at treff.us
>
>
> On Tue, Jul 30, 2024, at 11:25 AM, Louis Friedman wrote:
> > Thanks for the tip Doug. I did use those oil sorb pads, worked quite
> well. The engine stars better now but I find I still need to pump the
> butterfly pump about 40 times to get it going. there must be another leak
> of some kind somewhere. At this point I'm dealing with a steering issue
> though so I'll get back to the engine later.  thinking now I should have
> bought a newer boat!
> >
> > On Tue, Jul 30, 2024 at 10:52 AM Doug Treff <doug at treff.us> wrote:
> >> Lou,
> >>
> >> I had a similar problem when I bought my boat. Turns out the filter
> housing is aluminum and the bleed bolt is SS. At some point, a previous
> owner or mechanic overtightened the bolt and damaged the threads in the
> filter housing. Ultimately, I had to replace the housing. Was not the
> cheapest repair, but it did the trick.
> >>
> >> And as others have mentioned, the copper crush washers do occasionally
> need to be replaced after several bleeding procedures. I keep a supply of
> them on board and every couple of years when I change filters and bleed the
> system, I'll replace the ones I disturb with fresh ones. They don't
> randomly start leaking - it's usually when they are loosened and tightened
> again (disturbed) that they start to leak.
> >>
> >> As for cleanup, get some of the oil-zorb pads and put them in your
> bilge to soak up the diesel. I have found that simple green is a great
> cleanup solution for oil and diesel after you've discarded the soaked
> oil-zorb pads.
> >>
> >> --
> >> Doug Treff
> >> doug at treff.us
> >>
> >> On Tue, Jul 16, 2024, at 8:42 AM, Louis Friedman via C320-list wrote:
> >> > thanks all.  I recruited someone more experienced than me at out
> club(not
> >> > hard to do!) and it turned out to be a loose nut at the point the
> fuel hose
> >> > enters the secondary fuel filter.  Seems to be running good now but I
> need
> >> > to clean up a pile of diesel fuel today!
> >> >
> >> > Lou
> >
> >
>
> >
> >
> >
>
>

--