Re: [OMC-Boats] engine wierdness

On Oct 29, 2009, at 5:48 PM, ANDY PERAKES wrote:

> I once had a crack in the rotor that would cause it to lose contact
> at different speed ranges so it can be almost anything. Sometimes
> failures can be induced by vibration, sometimes by heat, sometimes
> both or something completely different. As metal things like coils
> and wires expand and contract as they heat and cool, it can cause
> them to make intermittent contact that can be maddening to
> diagnose. Fuel could very well be a possibility too, things would
> indeed stop quick if you suddenly injected an air/water mix instead
> of an air/fuel mix.

ok so this is something i've wondered about........still learning how
engines actually work i guess..........if you have some water in your
line somehow and it makes it's way to the carb bowl, isn't it going
to get diluted a bit by the fuel already in the bowl? And once past
that point, wouldn't it go into one of the 6 cylinders OR if all 6
equally, isn't it further dilluted at that point being spread out
among 6 places? And if that's all true, then it seems the engine
would just cough a bit, then pick right back up a second later when
it got fed clean gas again? Seems like it would take a lot of
water in the line to completely and suddenly kill the engine, but im
not sure how it all works.

> Best way to check that would probably be connecting to a remote
> tank, but remember you'll still need to purge everything in the
> lines and bowl. It helps a lot that it starts back up for you.
> Good luck!

yeah, i'm glad about that too. although, it does take a while to
get it started again. not the greatest feeling when you are out on
the columbia alone in 50 degree weather and there aren't any other
boats around.
>
>
> ----- Original Message -----
> From: "Scott Veazie" <scottveazie@...>
> To: omc-boats@...
> Sent: Thursday, October 29, 2009 4:05:40 PM GMT -05:00 US/Canada
> Eastern
> Subject: Re: [OMC-Boats] engine wierdness
>
> Yup...no spark for the plugs. Also don't discount a bad condenser,
> I had one leave me stranded.
>
> > From: jdood@...
> > To: omc-boats@...
> > Date: Thu, 29 Oct 2009 12:45:06 -0700
> > Subject: Re: [OMC-Boats] engine wierdness
> >
> > yeah, maybe the coil - hope its something that easy. i guess that
> > would do it wouldn't it? if i understand it all correctly, if the
> > coil shuts down then no spark is being send to ANY of the plugs,
> > right? which would make the engine completely die instantly.
> >
> >
> > On Oct 29, 2009, at 10:41 AM, Scott Veazie wrote:
> >
> > > JD-
> > >
> > > >From my past experience, I would start with a new coil, then get
> > > new points, condenser, cap, rotor, check all spark plugs and
> wires.
> > > Get all that ignition nonsense eliminated as a potential problem,
> > > and then go from there. You probably won't have to replace your
> > > dist. cap though.
> > >
> > > ~Scott
> > >
> > > > From: jdood@...
> > > > To: omc-boats@...
> > > > Date: Thu, 29 Oct 2009 10:00:31 -0700
> > > > Subject: Re: [OMC-Boats] engine wierdness
> > > >
> > > >
> > > > i just don't see how it can be any kind of electrical system
> thing,
> > > > esp since i re-did most of the wiring this summer and it's now
> very
> > > > solid. but who knows. and what "electrical" stuff is happening
> > > > with the engine while its running anyway?
> > > >
> > > > - one wire sends power to the starter when the key is turned -
> > > that is
> > > > working fine
> > > >
> > > > - there's a purple wire that runs to the electric choke (i
> guess) on
> > > > the carb - perhaps that?
> > > >
> > > > - there's theres a wire going to the coil and stuff - perhaps
> that?
> > > >
> > > > - then there's the alternator - perhaps that?
> > > >
> > > >
> > > > The last 3 on this list i don't really understand at all, esp
> what
> > > > their function is AFTER the engine is up and running. If
> > > > electrical, it has to be something that functions not just to
> start
> > > > the engine, but to keep the engine running. Doesn't that just
> > > > narrow it down to the alternator? Or is there other electrical
> stuff
> > > > that has to do with the engine staying running?
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > On Oct 29, 2009, at 9:02 AM, ANDY PERAKES wrote:
> > > >
> > > > > I tend to agree with the electrical suspect. Fuel/air problems
> > > > > generally linger a bit and don't result in an immediate drop-
> out
> > > > > like you describe. Anything is possible though. I like the
> > > > > guidance Lee sent out awhile back where he said to
> eleiminate the
> > > > > possibility of electrical problems first since that's usually
> > > > > quicker and easier to do. Trouble is, intermittent electrical
> > > > > problems can be a nightmare to trace. Is there any
> possibility of
> > > > > hooking up some basic instrumentation to see if there is any
> > > > > electrical effect when it happens? If you see a sudden voltage
> > > > > change or current drop out, that would be a clear indicator.
> Good
> > > > > luck!
> > > > >
> > > > > Andy
> > > > > '67 Reveler
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "jd" <jdood@...>
> > > > > To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...
> > > > > >
> > > > > Sent: Thursday, October 29, 2009 11:44:16 AM GMT -05:00 US/
> Canada
> > > > > Eastern
> > > > > Subject: [OMC-Boats] engine wierdness
> > > > >
> > > > > took my boat out for the last of possible testing this season
> > > before
> > > > > things get too cold and rainy. didn't go as i hoped. i'll
> > > > > try and condense this down to it's simplest form:
> > > > >
> > > > > BEFORE (about a month ago):
> > > > >
> > > > > except for some slightly fast idling, engine ran well. Then I
> > > > > noticed it starting to do this weird intermittent thing where
> > > all the
> > > > > power (throttle) would just drop down to zero. It seemed to
> happen
> > > > > mainly during acceleration up to plane. This all was
> happening at
> > > > > the end of the season, so I have pretty much had the boat
> > > sitting for
> > > > > the past month waiting for parts and time. But I was
> thinking it
> > > was
> > > > > related to my falling apart carb and / or and electrical thing
> > > > > related to my rebuilt shifter switch. so......
> > > > >
> > > > > AFTER (yesterday):
> > > > >
> > > > > - I installed my nice practically new carb (rebuilt by flying
> > > fish).
> > > > > keep in mind, it was the exact same carb i have always had
> on the
> > > > > boat, just completely rebuilt. I also changed my air water
> > > separator
> > > > > cartridge beforehand to avoid any chance of issues from fuel
> > > that had
> > > > > sat for a month.
> > > > >
> > > > > - I installed a NOS shifter switch that I recently acquired.
> > > Tested
> > > > > with light after install, everything checked out. And as I
> said,
> > > > > it's basically new.
> > > > >
> > > > >
> > > > > So after those two major upgrades, the engine is doing the
> same
> > > dang
> > > > > thing. Started up, let it warm up a bit, took it for a spin.
> > > > > About 5-10 seconds after getting up on that first plane
> everything
> > > > > just dropped down to zero and unlike the past times, this
> time the
> > > > > engine died at the same time. Had to crank it over several
> times
> > > > > for it to start back up, and when it did, with the red lever
> set
> > > at
> > > > > full throttle it took several seconds for the RPMS to climb
> up to
> > > > > where they should be. I limped back to the dock.
> > > > >
> > > > > Then while at the dock idling for a few minutes, all of the
> sudden
> > > > > it just died again. At idle this time, not while accelerating.
> > > > > And every time it dies it is quick. It's not like it sits
> there
> > > and
> > > > > slowly dies. It just cuts out suddenly. So I of course tried
> to
> > > > > restart it. Nothing for several tries, then it acted like it
> was
> > > > > going to start, then it finally starts, coughing and
> sputtering a
> > > > > bit, then very slowly climbs up to full throttle (in neutral).
> > > > > I started thinking maybe a fuel pump issue. Disconnected fuel
> > > > > line, cranked engine, plenty of pumping of fuel happening.
> > > > >
> > > > > It seems sort of electrical in the way it just all of the
> sudden
> > > dies
> > > > > either at idle or accelerating. Yet when it finally starts
> back
> > > up it
> > > > > coughs and sputters and smokes a bit. Which sounds like bad
> fuel,
> > > > > yet I have a new water/fuel separator cartridge, the carb is
> new,
> > > > > and nothing looks dirty with the inline regular fuel filter.
> > > > >
> > > > >
> > > > > Any ideas?
> > > > >
> > > > >
> > > > >
> > > > >
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Received on Friday, 30 October 2009